Advances in ISSN: 2378-3168AOWMC

Obesity, Weight Management & Control
Review Article
Volume 4 Issue 1 - 2015
Atielogy, Prevention and Management of Obesity: A Nutritional Approach
Oluwatoyin Oluwole*, Tosin Olasehinde, Temiloluwa Adesioye, Olajumoke Odediran, Phebean Ibidapo, Bamke Adeyoju, Folashade Owolabi, Joy Onyibe and Adebukola Agboola
Department of Food Technology, Federal Institute of Industrial Research Oshodi, Lagos, Nigeria
Received:November 08, 2015 | Published: January 18, 2016
*Corresponding author: Oluwatoyin Oluwole, Department of Food Technology, Federal Institute of Industrial Research Oshodi, Lagos, Nigeria, Email:
Citation: Oluwole O, Olasehinde T, Temiloluwa A, Olajumoke O, Phebean I, et al. (2016) Atielogy, Prevention and Management of Obesity: A Nutritional Approach. Adv Obes Weight Manag Control 4(1): 00078. DOI: 10.15406/aowmc.2015.03.00078

Abstract

Obesity is a chronic, multifactorial condition with complex metabolic and behavioral causes and consequences. Epidemiological studies have shown that obesity contributes to the increase in mortality from cancers of the colon, breast (in postmenopausal women), endometrium, kidney (renal cell), esophagus (adenocarcinoma), gastric cardia, pancreas, gallbladder and liver and possibly other types while some experimental investigations have revealed that obesity is a major risk factor for type 2 diabetes, atherosclerosis, cancer and other chronic diseases. Factors such as high caloric intake, genetic factors and psychological factors can lead to obesity. Furthermore, pharmaceuticals, sleep duration, environmental temperature and endocrine disruptors have been established to also be a causative factor of obesity. The therapeutic approach for the treatment of obesity involves different mechanisms and strategies. Plant-based diets are increasingly being recognized for their health benefits in weight management, satiety effects and glycemic control. Therefore, dietary agents that have a potential to decrease body fat or improve hyperglycemia may be used as therapeutic agents for the treatment and/or management of obesity. This review therefore focus on the role of functional foods and nutraceuticals in the treatment and/or management of obesity

Introduction

Obesity is a chronic, multifactorial condition with complex psychological, environmental (social and cultural), genetic, physiologic, metabolic and behavioral causes and consequences. There are indications that prevalence of overweight and obese people is increasing worldwide in many developing and developed countries. Environmental and behavioral changes brought about by economic development, modernization and urbanization have been linked to the rise in global obesity. Rising rates of obesity have been linked to food supply trends and to the increase in the consumption of energy-dense foods [1-3]. An increased consumption of snacks [4], caloric beverages [5,6] and fast foods [7] by children and young adults has been shown repeatedly to be associated with obesity and excess weight gain. Studies have examined the contribution to the obesity epidemic of dietary sugars and fats [8], larger portion sizes [9] and the lower nutrient density of foods eaten away from home [10].
Epidemiological studies have shown that obesity contributes to the increase in mortality from cancers of the colon, breast (in postmenopausal women), endometrium, kidney (renal cell), esophagus (adenocarcinoma), gastric cardia, pancreas, gallbladder and liver and possibly other types [11] while some experimental investigations have revealed that obesity is a major risk factor for type 2 diabetes, atherosclerosis, cancer and other chronic diseases [12].
The common approach to the measurement and identification of overweight and obesity is the use of body mass index (BMI). Although some reports have supported the use of BMI, it is not a perfect measurement. BMI is not a direct measure of adiposity and as a consequence it can overestimate or underestimate adiposity. BMI is a derived value that correlates well with total body fat and markers of secondary complications, e.g., hypertension and dyslipidemia. An abnormally high body mass index does not address the distribution of body fat. BMI is solely dependent on height and weight and does not consider other factors such as a person's physical activity level, sex or age. Obesity is a risk factor for metabolic syndromes and therapeuctic approach for the treatment of obesity involves different mechanisms and strategies

Factors that induce Overweight and Obesity

High caloric intake
Food intake can be affected by many factors such as portion size, taste, variety and accessibility of foods. A high fat diet enriched with saturated fatty acids is the common diet in many developed countries while vegetarian diet is common to developing countries [13]. Liu et al. [14] reported that diet may affect body weight by controlling satiety and metabolic efficiency, or by modulating insulin secretion and action. Thus, the calorie dense diet common in the western world may induce obesity via increase in postprandial insulin levels resulting from the high carbohydrate intake which leads to increased triglyceride storage in the adipose tissue depots [15]. High insulin levels may also provoke a vicious metabolic cycle. Insulin induces hunger by depleting the glucose levels of the blood and this promotes further food intake which leads to greater insulin secretion. This metabolic cycle will lead to overweight and chronic hyperinsulinaemia [16,17]. Moreover, some researchers have reported that obese subjects have a high preference for fatty foods13 which will heighten the release of insulin and storage of triglyceride.
Furthermore, previous studies have shown that there is a positive correlation between high fat diet and obesity [18,19]. This also agrees with the report of [20] and Piers et al. [21] which revealed that food containing saturated fat causes weight gain compared to food containing unsaturated fatty acids. This is because Fatty acids activate peroxisome proliferator-activated receptors delta and gamma (PPAR δ, PPAR γ), which promote adipogenesis and expansion of adipose tissue depots [22]. The common diet in many developed and developing countries contains more fat and considerably less fibre than the recommended levels which leads to the prevalence of obesity.
Genetic factors
The genes may act as determinant factor of BMI by modulating energy balance. More than 300 genes, markers and chromosomes have been discovered to be linked with physical characteristics related with human obesity [23] and it has been estimated that 30–70% of the variance in BMI in humans can be explained by genetic factors [24]. Some reports have linked the leptin gene with the role adipose tissues play in the regulation of energy balance and appetite [25]. Leptin play a major role by reducing food take via its action within the arcuate nucleus of the hypothalamus which decreases the expression of orexigenic signals and increase the levels of anorexigenic signals [26]. There are many other genes which are expressed in the hypothalamus that controls appetite. However the mutation of these genes contributes to low cases of human obesity which makes it difficult to understand the pathologic process of this condition. Nevertheless, recent experimental investigations involving gene screening techniques have revealed that some genes may induce the deposition of adipose tissues. Many of these genes have been found to be present in the central nervous system and are responsible for the regulation of food intake [27].
Psychological factors
The psyche of humans can influence eating habits, due to the fact that many people eat in response to negative emotions. Also stress for example, not only increases consumption of food but also shifts consumption toward high caloric foods that are normally avoided [28]. An experimental investigation using rodent models reported by Dallman et al. [29] revealed that high levels of adrenal glucocorticoid (GC) which are released due to stress can induce increase in food intake which in turn causes abdominal obesity. Furthermore some neurological disorders can induce high intake of food which contributes to the accumulation fat [30]. A study carried out by Johanssen et al. [31] and Blisset et al. [32] revealed that families of patients with morbid obesity have proposed that abnormal or irrational eating habits of families, parental conflicts and parents’ psychopathology may influence weight gain in children.
Other factors
Other factors that may contribute to the pathogenesis of obesity include
Pharmaceuticals: Some synthetic drugs such as antidepressants (e.g. serotonin re-uptake inhibitors), contraceptives, corticosteroids, antidiabetic agents (e.g. insulin, sulphonylureas and thiazolidinediones) and some antihypertensive agents (e.g. beta adrenergic receptor
antagonists) may lead to increase in weight gain [33].
Sleep duration: It has been shown in human studies that longer sleep duration is associated with high BMI [34]
Endocrine disruptors: The by-products of industrial processes can leak into the environment and hence into the food chain. These molecules are able to elicit endocrine responses and include agents that have oestrogen-like effects (e.g. vinclozolin and bisphenol A) and also substances that are able to activate adipogenesis via interaction with transcription factors [34].
Environmental temperature: The advent of air conditioners has meant that humans spend less time in temperatures outside the thermoneutral zone (TNZ). The TNZ is the range of temperatures over which changes in metabolic rate are not required to maintain normal body temperature. Once a person leaves the TNZ, energy expenditure will increase in an attempt to maintain body temperature at the required level. Thus, in humans who are constantly within the TNZ, energy expenditure is reduced and this predisposes to weight gain at lower levels of energy intake when compared to subjects who do not spend large periods of time within the TNZ [34].

Role of Functional Foods and Nutraceuticals in the Treatment and/or Management of Obesity

Given the worldwide increase in obesity and its health consequences, efficient strategies for its prevention and treatment are important. Since obesity arises from an energy imbalance whereby energy intake exceeds energy expenditure, prevention and treatment of obesity requires some changes in one or both components of energy balance. Strategies to weight management targets multiple aspects of the energy balance systems: dietary energy intake, physical energy expenditure, energy storage and lifestyle changes via the use of natural and synthetic compounds. However, the use of functional foods designed for weight management may be a more attractive approach than the use of synthetic drugs due to their side effects [35].
Plant-based diets are increasingly being recognized for their health benefits in weight management, satiety effects and glycemic control. Therefore, dietary agents that have a potential to decrease body fat or improve hyperglycemia may be used as therapeutic agents for the treatment and/or management of obesity. Several functional food ingredients are known to post absorptively influence substrate utilization or thermogenesis. Characteristics and supporting data on conjugated linoleic acid, diglycerides, medium-chain triglycerides, green tea, ephedrine, caffeine, capsaicin and calcium, are examples of compounds that alter energy expenditure or appetite control.
Dietary interventions
Reduction of energy intake: Functional foods are foods that are capable of demonstrating physiological effects and can reduce the risk of chronic diseases beyond their basic nutritional functions. Functional foods have the potential to reduce energy intake by inducing satiety. These foods can increase the sense of fullness and discourage overeating thereby reducing energy intake. There are three strategies that can be used to increase satiety. These include;
a) Modification of the energy density of the diet;
b) Modification of the macronutrient composition of the diet; and
c) modification of the glycemic index of the diet. Satiety is physiologically associated with the total volume of food consumed.
Therefore, modification of the energy density could contribute to the reduction of total energy intake and therefore reduce obesity and overweight [36]. One physiological signal for satiety may relate to the total weight or volume of food ingested. This suggests that modifying the energy density of the diet could be a way to reduce total energy intake and therefore reduce obesity. The main determinant of energy density is the non-caloric content of the food, primarily the water content. Foods with high water content have a lower energy density [37,38].
Research has shown that fiber also reduces energy density since it contributes substantially more to food weight than to caloric content. Dietary fiber intake seems to affect total energy intake. Increase in fiber diets have been linked to lower food intake. This is due to the fact that fiber diets may trigger maximal sensory stimulation in the mouth due to the increased need for chewing, reduce gastric emptying and a slow rate of nutrient absorption and reduce the energy density of the overall diet. Moreover, scientific investigations have shown that increase in dietary fiber is generally thought to aid in weight management [39].
Further, macronutrient composition of a diet can affect its energy density. Some reports have revealed that fat has a higher energy-density than either protein or carbohydrate. Therefore reducing the proportion of fat in the diet can have a major impact on reducing the energy density of the diet. Previous reports show that reducing energy density reduces energy intake (at least in the short term), functional foods aimed at modifying energy density may be useful in managing obesity [36].
The glycemic index of a food is determined by the level of postprandial glucose that occurs after eating that food in relation to the rise in glucose seen after eating a standardized food such as white bread. High glucose levels following eating would stimulate insulin secretion which may consequently increase appetite and facilitate other disease processes linked to insulin action. Whether or not the glycemic index of the diet affects energy intake and obesity remains controversial. There is no convincing evidence that food intake is directly related to glycemic index, although there is some evidence that high glycemic diets are linked to weight gain. The glycemic index of the total diet could be modified by eating foods with a low glycemic index. If the glycemic index were shown to affect food intake, a good target would be to develop more good-tasting, low-glycemic foods [40].
Functional foods to increase energy expenditure
Increase in the total energy expenditure without increasing energy intake is another approach for the management and/or prevention of obesity. Some bioactive compounds mostly known as nutraceuticals which are present in functional foods are capable of enhancing energy expenditure.
Caffeine and ephedrine: A combination of caffeine and ephedrine has shown to be effective in long-term weight management, likely due to different mechanisms that may operate synergistically, e.g., respectively inhibiting the phosphodiesterase-induced degradation of cAMP and enhancing the sympathetic release of catecholamines. There has, however, been recent concern about the longterm safety of ephedrine [41].
Tea: Green tea, by containing both tea catechins and caffeine, may act through the inhibition of catechol O-methyl-transferase and the inhibition of phosphodiesterase. Here, the mechanisms may also operate synergistically. In addition, tea catechins have antiangiogenic properties that may prevent the development of obesity. Furthermore green, black and oolong teas may cause decreased energy intake from the gastrointestinal tract due to their interactions with pancreatic lipase. Previous reports have shown that bioactive components present in some teas (catechin and epigallocatechin-3-gallate) are capable of enhancing weight loss [42,43]. Furthermore polyphenols such as L-epicatechin, epicatechin-3-gallate, epigallocatechin, epigallocatechin-3-gallate which were isolated from tea extracts are potent inhibitors of pancreatic lipase which contributes to weight loss [44,45].
Oolong tea also contribute to increasing energy expenditure, perhaps through its catechin content. Resting metabolic rate was increased by 3–4% during three days of oolong tea consumption at five cups per day. Interestingly, most of the rise in metabolic rate was from increased fat oxidation, which would have the greatest impact upon decreasing body fat stores [46]. The mechanism for increasing energy expenditure by green tea has been postulated to be its flavonoid content and even more specifically its polyphenolic content. One class of these compounds, the catechins, has been shown to inhibit catechol Ο-methyltransferase (COMT), an enzyme that degrades norepinephrine [47]. Although there are numerous catechins in green tea, probably the most influential is epigallocatechin gallate (EGCG). This cannot be obtained in appreciable amounts from any other food source. The inhibition of COMT by catechins allows norepinephrine to exert a prolonged influence on thermogenesis and fat metabolism. Both of these metabolic processes are controlled by the sympathetic nervous system via norepinephrine. The delay in degrading norepinephrine allows it to remain in the sympathetic synaptic cleft longer and there for exert its effect. Caffeine also has an effect on norepinephrine by inhibiting phosphodiesterases and prolonging the life of cAMP in the cell. These actions coupled with the sustained effect of norepinephrine caused by EGCG greatly affect thermogenesis [48].
Capsaicin: Capsaicin the main bioactive compound in pepper fruits has been shown to be effective in the management of obesity but when it is used clinically it requires a strong compliance to a certain dosage. This dosage has not been shown to be feasible yet. Scientists are reporting new evidence that capsaicin may cause weight loss and fight fat buildup by triggering certain beneficial protein changes in the body [49].
Calcium: Recent reports have revealed that diets rich in calcium may contribute to weight loss and that part of the mechanism may be an increase in energy expenditure [50]. In some previous studies, high Ca intake was associated with a lower BMI, but there has yet been no clear demonstration that this is a causal relationship [51].

Other compounds helpful in weight reduction
Brain serotonin: An experimental investigation conducted by Bell & Goodrick [47] revealed that brain serotonin can reduce overeating. This work suggests a role for amino acids in regulating food intake. The brain neurotransmitter serotonin is produced via the conversion of tryptophan to 5-HTP. Serotonin enhances energy balance and induces the circadian patterns of eating (i.e., three times a day) by activating the neurons responsible for satiety in the medial hypothalamus. Serotonin also decreases rate of appetite and carbohydrate intake by interacting with norepinephrine antagonistically.
Dietary chromium: Dietary chromium is an essential trace element that is capable of enhancing insulin action. Chromium deficiency can lead to impaired glucose metabolism, insulin resistance and hyperglycemia. Supplementation can reduce the severity of these symptoms. Adequate insulin utilization can lead to decrease in body fat. In addition, correcting insulin resistance may have a positive effect on muscle mass by slowing its catabolism [52].
Naturally occurring bioactive compounds
Some bioactive compounds such as phenolic compounds, lipoic acid and n-3 LC-PUFA have been discovered to have antiobesity activity.
Phenolic compounds: Some in vivo and in vitro experiments have shown the anti-obesity activity of some flavonoids and phenolic acid. Mahat et al. [53] reported that flavonoids such as kaempferol, apigenin and luteolin have the ability to block molecular mechanisms involved in triggering the inflammatory response, especially the signalling pathway of the transcription factor NF-κB, which increases the expression of genes that encode proteins involved in obesity-related inflammation
Apigenin is capable of reducing food intake by inducing gene expression of anorexigenic neuropeptides [54]. The potential of kaempferol to increase energy expenditure Kaempferol may cause increase in skeletal myocyte oxygen consumption and high energy expenditure da Silva et al. [55]. Furthermore, the anti-inflammatory, anti-oxidant and proapoptotic effects of quercetin have been linked to its antiobesity activity. An animal experiment conducted by Stewart et al. [56] using mice fed with high fat diet revealed that there was increase in energy expenditure due to the supplementation of the rat feed with quercetin. The anti obesity activity of reveratrol has been linked with its ability to decrease lipid synthesis in adipocytes by PPAR-γ supression, increase lipolysis and reduce lipid accumulation in maturing preadipocytes [57,58], through the inhibition of lipogenesis and differentiation of 3T3-L1 adipocytes via activation of AMPK in a dose-dependent manner [59] and inhibition of adipogenesis by means of GSH up-regulation [60].
Curcumin is the most important polyphenolic compound in turmeric (Curcuma Longa L.) which is a rhizome ginger (Zingiber officinale). Ejaz et al. [61] reported that curcumin can reduce body weight gain and adiposity, decrease serum cholesterol, suppress angiogenesis in adipose tissue, inhibits adipocyte differentiation [62,63] and decrease lipid accumulation by reducing the expression of fatty acid synthase (FAS).
Some reports have revealed the potentials of catechins (the most abundant phenolic compound present in tea and beverages) in the management of obesity. Wang et al. [64] and Basu et al. [65] reported that catechins are capable of improving body composition and lower and reduce oxidative. In an experiment involving diabetic patients, it was reported that catechin rich beverages reduced body weight, increased adiponectin secretion and recovered insulin secretory ability and abdominal adiposity in moderately overweight subjects. In diabetic subjects, catechin-rich beverages have also contributed to reducing body weight, increasing adiponectin secretion and recovering insulin-secretory ability [66]. Other researchers have also linked the anti-obesity activity of catechins to their ability to reduce adipocyte differentiation, proliferation, lipogenesis [59,67,68], fat mass, body weight, oxidised LDL-c and blood pressure and can improve glycemic control [69-72]. Furthermore phenolic acids have been reported to inhibit adipocyte proliferation and enzymes involved in carbohydrate metabolism and lipid pathways and improve adipocyte metabolism [73-76]. Son et al. [77] also reported the antiobesity activity of ferulic acid and its derivative, gamma-oryzanol which was associated with regulation of insulin secretion and hepatic glucose-regulating enzyme activities which reduces the risk of hyperglycemia induced by high fat
n-3 Long-chain polyunsaturated fatty acids: Some experimental investigations have revealed that some polyunsaturated fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) show some physiological effects in the adipose tissue. In-vitro studies reported by 89-92 revealed the EPA and DHA has the capacity to inhibit adipocyte differentiation, increase cell apoptosis and up-regulate the expression of PPAR-γ, proteins that enhance glucose uptake and improve insulin resistance. Furthermore, results from in vivo experiment conducted by Flachs et al. [78] and Perez-Matute et al. [79] revealed that EPA improved insulin resistance and hypolipidemia in animals fed with a high-fat diet, reduces adipose tissue inflammation and visceral adiposity, increases adipocyte apoptosis and serum adiponectin and up-regulates mitochondrial biogenesis, which may induce β-oxidation in white fat.
Lipoc acid: Lipoic acid is an organo-sulfur compound derived from caprylic acid that acts as a co-factor of mitochondrial enzymes. It is synthesised in the human body, but is also present in foods and has gain much interest due to its therapeutic potential [80]. Lipoic acid has been considered to be effective in the management of obesity due to its ability to modulate adipogenesis [81] and induce the release of adipokines, such as leptin, adiponectin and apelin. The anti-obesity mechanisms of lipoic acid improve mitochondrial function via the stimulation of organelle biogenesis and consistent activation of Beta oxidation metabolic pathway [82,83]. Prieto-Hontoria et al. [84] and Salinthone et al. [85] associated the anitobesity activity of lipoic acid to reduction of inflammation via cAMP, prevention of high-fat diet induced weight gain, slight increase in apelin expression and decrease in intestinal sugar uptake and insulin resistance.
Medicinal plants
Herbal supplements are common therapies for weight loss and are used as complementary and alternative therapeutic approach for the treatment and/or management of obesity [86]. Many natural bioactive compounds and medicinal plants, including crude extracts and isolated compounds from plants can be used to induce weight loss and prevent diet-induced obesity. Many researchers have reported the use of herbal supplements in the management of obesity due to containing a large variety of several components with different anti-obesity and anti-oxidant effects on body metabolism and fat oxidation.
Anti-obesity activity of some medicinal plants have been linked to the reduction in lipid absorption, reduced energy intake, increased energy expenditure, decreased pre-adipocyte differentiation and proliferation, or decreased lipogenesis and increased lipolysis.
Moreover, chitosan, levan, mate tea, oolong tea, jasmine tea and green tea have been reported to inhibit pancreatic lipase [87-92]. Further medicinal plants such as turmeric, capsicum, palm oil, banana leaf, brown algae, flaxseed, garlic and soybean are capable of preventing adipocyte differentiation [93-96]. Okuda et al. [90] and Smyth & Heron [97] reported that herb teas and cinnamon enhances lipid metabolism while pine nut, pomegranate leaf and ginseng helps to decrease appetite [98-100]. Yun [101] reported that Nigella Sativa showed was able to enhance weight loss and re-duce waist circumference with a mild reduction in fasting blood sugar, triglycerides and low-density lipoprotein levels [102]. Pistachio [103], Psyllium Fibre [104], black Chinese Tea [43], Camellia Sinensis [105], Yacon Syrup [106], Oolong Tea [107], Xantigen [108] and olive oil [109] also show similar antiobesity activity with Nigella sativa. Furthermore, previous reports on the anti-obesity effects of whole grain, pistachio, virgin olive oil and nuts revealed that these herbal plants were capable of reducing obesity [110].

References

  1. Putnam J, Allshouse J, Kantor LS (2002) U. S. per capita food supply trends: more calories, refined carbohydrates, and fats. Food Review 25(3): 2-15.
  2. Nielsen SJ, Siega-Riz AM, Popkin BM (2002) Trends in energy intake in US. between 1977 and 1996; similar shifts seen across age groups. Obes Res 10(5): 370-378.
  3. Kant AK (2000) Consumption of energy-dense, nutrient-poor foods by adult Americans: nutritional and health implications. The Third National Health and Nutrition Examination Survey, 1988-1994. Am J Clin Nutr 72(4): 929-936.
  4. Zizza C, Siega-Riz AM, Popkin BM (2001) Significant increase in young adults’ snacking between 1977-1978 and 1994-1996 represents a cause for concern! Prev Med 32(4): 303-310.
  5. Harnack L, Stang J, Story M (1999) Soft drink consumption among U. S. children and adolescents: nutritional consequences. J Am Diet Assoc 99(4): 436-441.
  6. Ludwig DS, Peterson KE, Gortmaker SL (2001) Relation between consumption of sugar-sweetened drinks and childhood obesity: a prospective, observational analysis. Lancet 357(9255): 505-508.
  7. French SA, Story M, Jeffery RW (2001) Environmental influences on eating and physical activity. Annu Rev Public Health 22: 309-335.
  8. Bray GA, Popkin BM (1998) Dietary fat intake does affect obesity! Am J Clin Nutr 68(6): 1157-1173.
  9. Young LR, Nestle M (2002) The contribution of expanding portion sizes to the obesity epidemic. Am J Public Health 92(2): 246-249.
  10. McCrory MA, Fuss PJ, Hays NP, Vinken AG, Greenberg AS, et al. (1999) Overeating in America: association between restaurant food consumption and body fatness in healthy adult men and women ages 19-80. Obes Res 7(6): 564-71.
  11. Yi Zhang, Ju Liu, Jianliang Yao, Gang Ji, Long Qian, et al. (2014) Obesity: Pathophysiology and Intervention. Nutrients 6(11): 5153-5183.
  12. Wilhelmsen L, Rosengren A, Eriksson H, Lappas G (2001) Heart failure in the general population of mendmorbidity, risk factors and prognosis. J Intern Med 249(3): 253-261.
  13. Willett WC (2002) Dietary fat plays a major role in obesity. Obes Rev 3(2): 59-68.
  14. Cordain L, Eaton SB, Sebastian A, Mann N, Lindeberg S, et al. (2005) Origins and evolution of the western diet: Health implications for the 21st century. Am J Clin Nutr 81(2): 341-354.
  15. Liu S, Willett WC, Manson JE, Hu FB, Rosner B, et al. (2003) Relation between changes in intakes of dietary fiber and grain products and changes in weight and development of obesity among middle aged women. Am J Clin Nutr 78(5): 920-927.
  16. Ludwig DS (2000) Dietaryglycemicindex and obesity. J Nutr 130(2): 280S-283S.
  17. Cosford R (1999) Insulin resistance, obesity and diabetes: the connection. J Aus Coll Nutr Environ Med 18(1): 3-10.
  18. polonski K, Given B, Van Cauter E (1988) Twenty-four hour profiles and pulsatile patterns of insulin secretion in normal and obese subjects. J Clin Invest 81(2): 442-448.
  19. Bes-Rastrollo M, van Dam RM, Martinez-Gonzalez MA, Li TY, Sampson LL, et al. (2008) Prospective study of dietary energy density and weight gain in women. Am J Clin Nutr 88(3): 769-777.
  20. Savage JS, Marini M, Birch LL (2008) Dietary energy density predicts women’s weight change over 6 y. Am J Clin Nutr 88(3): 677-684.
  21. Soriguer F, Moreno F, Rojo-Martínez G, García-Fuentes E, Tinahones F, et al. (2003) Monounsaturated n-9 fatty acids and adipocyte lipolysis in rats. British J Nutr 90(6): 1015-1022.
  22. Piers LS, Walker KZ, Stoney RM, Soares MJ, O'Dea K (2003) Substitution of saturated with monounsaturated fat in a 4-week diet affects body weight and composition of overweight and obese men. British J Nutr 90(3): 717-727.
  23. Massiera F, Saint-Marc P, Seydoux J, Murata T, Kobayashi T, et al. (2003) Arachidonic acid and prostacyclin signaling promote adipose tissue development: a human health concern? J Lipid Res 44(2): 271-279.
  24. Chagnon YC, Rankinen T, Snyder EE, Weisnagel SJ, Pérusse L, et al. (2003) The human obesity gene map: the 2002 update. Obesity Res 11(3): 313-367.
  25. Loos RJ, Bouchard C (2003) Obesity - is it a genetic disorder? J Intern Med 254(5): 401-425.
  26. Zhang Y, Proenca R, Maffei M, Barone M, Leopold L, et al. (1994) Positional cloning of the mouse obese gene and its human homologue. Nature 372(6505): 425-432.
  27. Montague CT, Farooqi IS, Whitehead JP, Soos MA, Rau H, et al. (1997) Congenital leptin deficiency is associated with severe early-onset obesity in human. Nature 387(6636): 903-908.
  28. Willer CJ, Speliotes EK, Loos RJ, Li S, Lindgren CM, et al. (2009) Six new loci associated with body mass index highlight a neuronal influence on body weight regulation. Nature Genet 41(1): 25-34.
  29. Zellner DA, Loaiza S, Gonzalez Z, Pita J, Morales J, et al. (2006) Food selection changes under stress. Physiol Behav 87(4): 789-793.
  30. Dallman MF, Pecoraro N, Akana SF, La Fleur SE, Gomez F, et al. (2003) Chronic stress and obesity: A new view of “comfort food”. Proc Natl Acad Sci 100(20): 11696-11701.
  31. Doll HA, Petersen SEK, Stewart-Browan S (2000) Obesity and physical and emotional well-being: associations between body mass index, chronic illness, and the physical and mental components of the SF-36 Questionnaire. Obesity Res 8(2): 160-170.
  32. Johannsen DL, Johannsen NM, Specker BL (2006) Influence of parents’ eating behaviours and child
    feeding practices on children’s weight status. Obesity 14(3): 431-439.
  33. Blissett J, Meyer C, Haycraft E (2006) Maternal and paternal controlling feeding practices with male and female children. Appetite 47(2): 212-219.
  34. Adam Wysokiski, Iwona Koszewska (2014) Mechanisms of Increased Appetite and Weight Gain Induced by Psychotropic. Journal of Advanced Clinical Pharmacology 1: 12-33.
  35. Hil JO, Peters JC (2002) Biomarkers and functional foods for obesity and diabetes. Br J Nutr 88(2): 213-218.
  36. Monika Choudhary, Kiran Grover (2012) Development of functional food products in relation to obesity. Functional Foods in Health and Disease 2(6): 188-197.
  37. Rolls B, Barnett RA (2000) Volumetrics. Harper-Collins, New York USA.
  38. Grunwald GK, Seagle HM, Peters JC, Hill JO (2001) Quantifying and separating the effects of macronutrient composition and non-energetic food components on energy density. Br J Nutr 86(2): 265-276.
  39. Pereira MA, Ludwig DS (2001) Dietary fiber and body weight regulation: observations and mechanisms. Pediatr Clin North Am 48(4): 969-980.
  40. Ludwig DS (2000) Dietary glycemic index and body weight regulation. Nutr Soc Aust 24: 286-293.
  41. Yoshioka M, Doucet E, Drapeau V, Dionne I, Tremblay A (2001) Combined effects of red pepper and caffeine consumption on 24 h energy balance in subjects given free access to foods. Br J Nutr 85(2): 203-211.  
  42. Wang H, Wen Y, Du Y, Yan X, Guo H, et al. (2009) Effects of catechin enriched green tea on body composition. Obesity 18(4): 773-779.
  43. Kubota K, Sumi S, Tojo H, Sumi-Inoue Y, I-Chin H, et al. (2011) Improvements of mean body mass index and body weight in preobese and overweight Japanese adults with black Chinese tea [Pu-Erh] water extract. Nutr Res 31(6): 421-428.
  44. Nakai M, Fukui Y, Asami S, Toyoda-Ono Y, Iwashita T, et al. (2005) Inhibitory effects of oolong tea polyphenols on pancreatic lipase in vitro. J Agric Food Chem 53(11): 4593-4598.
  45. Thielecke F, Boschmann M (2009) The potential role of green tea catechins in the prevention of the metabolic syndrome-a review. Phytochemistry 70(1): 11-24.
  46. Rumpler W, Seale J, Clevidence B, Judd J, Wiley E, et al. (2001) Oolong tea increases metabolic rate and fat oxidation in men. J Nutr 131(11): 2848-2852.
  47. Kao YH, Hiipakka RA, Liao S (2000) Modulation of endocrine systems and food intake by green tea epigallocatechin gallate. Endocrinology 141(3): 980-987.
  48. Bell SJ, Goodrick GK A (2002) Functional Food Product for the Management of Weight. Crit Rev Food Sci Nutr 42(2): 163-178.
  49. Diepvens K, Westerterp KR, Plantenga MS (2007) Obesity and thermogenesis related to the consumption of caffeine, ephedrine, capsaicin, and green tea. AJP - Regu Physiol January 292(1): 77-85.
  50. Zemel MB, Shi H, Greer B, Dirienzo D, Zemel PC (2000) Regulation of adiposity by calcium. FASEB Journal 14(9): 1132-1138.
  51. Davies KM, Heaney RP, Recker RR, Lappe JM, Lux MJ B, et al. (2000) Calcium intake and body weight. JCEM 85(12): 4635-4638.
  52. Bahadori B, Wallner S, Schneider H, Wascher TC, Toplak H (1997) Effect of chromium yeast and chromium picolinate on body composition of obese, non-diabetic patients during and after a formula diet. Acta Medica Austriaca 24(5): 185-187.  
  53. Kaats GR, Blum K, Pullin D, Keith SC, Wood R (1998) A randomized, double-masked, placebo controlled study of the effects of chromium picolinate supplementation on body composition: A replication and extension of a previous study. Curr Ther Res 59(6): 379-388.
  54. Mahat MY, Kulkarni NM, Vishwakarma SL, Khan FR, Thippeswamy BS, et al. (2010)Modulation of the cyclooxygenase pathway via inhibition of nitric oxide production contributes to the anti-inflammatory activity of kaempferol. Eur J Pharmacol 642(1-3): 169-176.
  55. Myoung HJ, Kim G, Nam KW (2010) Apigenin isolated from the seeds of Perilla frutescens britton var crispa (Benth.) inhibits food intake in C57BL/6J mice. Arch Pharm Res 33(11): 1741-1746.
  56. da-Silva WS, Harney JW, Kim BW, Li J, Bianco SD, et al. (2007)The small polyphenolic molecule kaempferol increases cellular energy expenditure and thyroid hormone activation. Diabetes 56(3): 767-776.
  57. Stewart LK, Soileau JL, Ribnicky D, Wang ZQ, Raskin I, et al. (2008) Quercetin transiently increases energy expenditure but persistently decreases circulating markers of inflammation in C57BL/6J mice fed a high-fat diet. Metabolism 57(7 Suppl 1): S39-S46.
  58. Fischer-Posovszky P, Kukulus V, Tews D, Unterkircher T, Debatin KM, et al. (2010) Resveratrol regulates human adipocyte number and function in a Sirt1-dependent manner. Am J Clin Nutr 92(1): 5-15.
  59. Picard F, Kurtev M, Chung N, Topark-Ngarm A, Senawong T, et al. (2004) Sirt1 promotes fat mobilization in white adipocytes by repressing PPAR-g. Nature 429: 771-776.
  60. Chen S, Li Z, Li W, Shan Z, Zhu W (2011) Resveratrol inhibits cell differentiation in 3T3-L1 adipocytes via activation of AMPK. Can J Physiol Pharmacol 89(11): 793-799.
  61. Vigilanza P, Aquilano K, Baldelli S, Rotilio G, Ciriolo MR (2011) Modulation of intracellular glutathione affects adipogenesis in 3T3- L1 cells. J Cell Physiol 226(8): 2016-2024.
  62. Ejaz A, Wu D, Kwan P, Meydani M (2009) Curcumin Inhibits Adipogenesis in 3T3-L1 Adipocytes and Angiogenesis and Obesity in C57/BL Mice. J Nutr 139(5): 919-925.
  63. Zhao J, Sun X-B, Ye F, Tian W-X (2011) Suppression of fatty acid synthase, differentiation and lipid accumulation in adipocytes by curcumin. Mol Cell Biochem 351(1-2): 19-28.
  64. Kim CY, Le TT, Chen C, Cheng J-X, Kim KH (2011)Curcumin inhibits adipocyte differentiation through modulation of mitotic clonal expansion. J Nutr Biochem 22(10): 910-920.
  65. Wang H, Wen Y, Du Y, Yan X, Guo H, et al. (2010) Effects of catechin enriched green tea on body composition. Obesity 18(4): 773-779.
  66. Basu A, Sanchez K, Leyva MJ, Wu M, Betts NM, et al. (2010) Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndrome. J Am Coll Nutr 29(1): 31-40.
  67. Nagao T, Meguro S, Hase T, Otsuka K, Komikado M, et al. (2008) A Catechin-rich Beverage Improves Obesity and Blood Glucose Control in Patients With Type 2 Diabetes. Obesity 17(2): 310-317.
  68. Kim H, Sakamoto K (2011) (-)-Epigallocatechin gallate suppresses adipocyte differentiation through the MEK/ERK and PI3K/AKT pathways. Cell Biol Int 36(2): 147-153.
  69. Ueda M, Furuyashiki T, Yamada K, Aoki Y, Sakane I, et al. (2010) Tea catechins modulate the glucose transport system in 3T3-L1 adipocytes. Food Funct 1(2): 167-173.
  70. Osam Kajimoto, Yoshitaka Kajimoto, Mitsuharu Yabune, Tadashi Nakamura, Kazuaki Kotani, et al. (2005) Tea Catechins with a Galloyl Moiety Reduce Body Weight and Fat. J Health Sci 51(2): 161-171.
  71. Nagao T, Komine Y, Soga S, Meguro S, Hase T, et al. ( 2005)Ingestion of a tea rich in catechins leads to a reduction in body fat and malondialdehydemodified LDL in men. Am J Clin Nutr 81(1): 122-129.
  72. Nagao T, Hase T, Tokimitsu I (2007) A green tea extract high in catechins reduces body fat and cardiovascular risks in humans[ast]. Obesity 15(6): 1473-1483.
  73. Wu CH, Lu FH, Chang CS, Chang TC, Wang RH, et al. (2003)Relationship among Habitual Tea Consumption, Percent Body Fat, and Body Fat Distribution. Obesity 11(9): 1088-1095.
  74. Hsu C-L, Huang S-L, Yen G-C (2006) Inhibitory Effect of phenolic acids on the proliferation of 3T3 L1 preadipocytes in relation to their antioxidant activity. J Agric Food Chem 54(12): 4191-4197.
  75. Nagasaka R, Chotimarkorn C, Shafiqul IM, Hori M, Ozaki H, et al. (2007) Anti-inflammatory effects of hydroxycinnamic acid derivatives. Biochem Biophys Res Commun 358(2): 615-619.
  76. Hsu CL, Lo WH, Yen GC (2007) Gallic acid induces apoptosis in 3t3- l1 pre-adipocytes viaa fas- and mitochondrial-mediated pathway. J Agric Food Chem 55(18): 7359-7365.
  77. Ohara K, Uchida A, Nagasaka R, Ushio H, Ohshima T (2009) The effects of hydroxycinnamic acid derivatives on adiponectin secretion. Phytomedicine 16(2-3): 130-137.
  78. Son MJ, Rico CW, Nam SH, Kang MY (2011) Effect of oryzanol and ferulic acid on the glucose metabolism of mice fed with a high-fat diet. J Food Sci 76(1): 7-10.
  79. Flachs P, Horakova O, Brauner P, Rossmeisl M, Pecina P, et al. (2005) Polyunsaturated fatty acids of marine origin upregulate mitochondrial biogenesis and induce β- oxidation in white fat. Diabetologia 48(11): 2365-2375.
  80. Pérez-Matute P, Pérez-Echarri N, Martínez JA, Marti A, Moreno-Aliaga MJ (2007) Eicosapentaenoic acid actions on adiposity and insulin resistance in control and high-fat-fed rats: role of apoptosis, adiponectin and tumor necrosis factor-alpha. Br J Nutr 97(2): 389-398.
  81. GorÄ…ca A, Huk-Kolega H, Piechota A, Kleniewska P, Ciejka E, et al. (2011) Lipoic acid - biological activity and therapeutic potential. Pharmacol Rep 63(4): 849-858.
  82. Cho KJ, Moon HE, Moini H, Packer L, Chung AS, et al. (2003) Alpha-lipoic acid inhibits adipocyte differentiation by regulating pro-adipogenic transcription factors viamitogen-activated protein kinase pathways. J Biol Chem 278(37): 34823-34833.
  83. Prieto-Hontoria PL, Pérez-Matute P, Fernández-Galilea M, Martínez JA, Moreno-Aliaga MJ (2011) Lipoic acid inhibits leptin secretion and Sp1 activity in adipocytes. Mol Nutr Food Res 55(7): 1059-1069.
  84. Fernández-Galilea M, Pérez-Matute P, Prieto-Hontoria P, Martínez J, Moreno-Aliaga MJ (2011) Effects of lipoic acid on apelin in 3T3-L1 adipocytes and in high-fat fed rats. J Physiol Biochem 67(3): 479-486.
  85. Prieto-Hontoria PL, Pérez-Matute P, Fernández-Galilea M, Barber A, Martínez JA, et al. (2009) Lipoic acid prevents body weight gain induced by a high fat diet in rats: effects on intestinal sugar transport. J Physiol Biochem 65(1): 43-50.
  86. Salinthone S, Yadav V, Schillace RV, Bourdette DN, Carr DW (2010) Lipoic Acid Attenuates Inflammation via cAMP and Protein Kinase A Signaling. PLoS ONE 5(9): 1-10.
  87. Barnes PM, Powell-Griner E, McFann K, Nahin RL (2004) Complementary and alternative medicine use among adults: United States, 2002. Adv Data 343: 1-19.
  88. Bondiolotti G, Bareggi SR, Frega NG (2007) Activity of two different polyglucosamines, L11 2о and FF45о, on body weight in male rats. European journal of pharmacology 567(1-2): 155-158.
  89. Kang SA, Hong K, Jang KH, Kim YY, Choue R, et al. (2006) Altered mRNA expression of hepatic lipogenic enzyme and PPARα in rats fed dietary levan from Zymomonas mobilis. J Nutr Biochem 17(6): 419-426.
  90. Martins F, Noso TM, Porto VB, Curiel A, Gambero A, et al. (2009) Maté tea inhibits in vitro pancreatic lipase activity and has hypolipidemic effect on high-fat diet-induced obese mice. Obesity 18(1): 42-47.
  91. Okuda H, Han L, Kimura Y (2001) Anti-Obesity Action of Herb Tea. (Part 1). Effects or Various Herb Teas on Noradrenaline Induced Lipolysis in Rat Fat Cells and Pancreatic Lipase Activity. Japanese Journal of Constitutional Medicine 63(1-2): 60-65.
  92. Koo SI, Noh SK (2007) Green tea as inhibitor of the intestinal absorption of lipids: potential mechanism for its lipid-lowering effect. J Nutr Biochem 18(3): 179-183.
  93. Hsu TF, Kusumoto A, Abe K, Hosoda K, Kiso Y, et al. (2006) Polyphenol-enriched oolong tea increases fecal lipid excretion. Eur J Clin Nutr 60(11): 1330-1336.
  94. Ahn J, Lee H, Kim S, Ha T (2010) Curcumin-induced suppression of adipogenic differentiation is accompanied by activation of Wnt/β-catenin signaling. Am J Physiol Cell Physiol 298 (6): C1510-C1516.
  95. Klein G, Kim J, Himmeldirk K, Cao Y, Chen X (2007) Antidiabetes and anti- obesity activity of Lagerstroemia speciosa. Evid Based Complement Alternat Med 4 (4): 401-408.
  96. Maeda H, Hosokawa M, Sashima T, Takahashi N, Kawada T, et al. (2006) Fucoxanthin and its metabolite, fucoxanthinol, suppress adipocyte differentiation in 3T3-L1 cells. Int J Mol Med 18 (1): 147-152.
  97. Ambati S, Yang JY, Rayalam S, Park HJ, Della-Fera MA, et al. (2009) Ajoene exerts potent effects in 3T3‐L1 adipocytes by inhibiting adipogenesis and inducing apoptosis. Phytother Res 23(4): 513-518.
  98. Smyth S, Heron A (2006) Diabetes and obesity: the twin epidemics. Nat Med 12(1): 75-80.
  99. Kim JH, Hahm DH, Yang DC, Kim JH, Lee HJ, et al. (2005) Effect of Crude Saponin of Korean Red Ginseng on High Fat Diet-Induced Obesity in the Rat. J Pharmacol Sci 97(1): 124-131.
  100. Lei F, Zhang XN, Wang W, Xing DM, Xie WD, et al. (2007) Evidence of anti-obesity effects of the pomegranate leaf extract in high-fat diet induced obese mice. Int J Obes 31(6): 1023-1029.
  101. Pasman WJ, Heimerikx J, Rubingh CM, Berg RVD, O'Shea M, et al. (2008) The effect of Korean pine nut oil on in vitro CCK release, on appetite sensations and on gut hormones in post-menopausal overweight women. Lipids Health Dis 7: 10.
  102. Yun JW (2010) Possible anti-obesity therapeutics from nature-a review. Phytochemistry 71(14-15): 1625-1641.
  103. Datau EA, Wardhana, Surachmanto EE, Pandelaki K, Langi JA, et al. (2010) Efficacy of Nigella sativa on serum free testosterone and metabolic disturbances in central obese male. Acta Med Indones 42(3): 130-134.
  104. Li Z, Song R, Nguyen C, Zerlin A, Karp H, et al. (2010) Pistachio nuts reduce triglycerides and body weight by comparison to refined carbohydrate snack in obese subjects on a 12-week weight loss program. J Am Coll Nutr 29(3): 198-203.
  105. Pal S, Khossousi A, Binns C, Dhaliwal S, Ellis V (2011) The effect of a fibre supplement compared to a healthy diet on body composition, lipids, glucose, insulin and other metabolic syndrome risk factors in overweight and obese individuals. Br J Nutr 105(1): 90-100.
  106. Lenon GB, Li KX, Chang YH, Yang AW, Da Costa C, et al. (2012) Efficacy and safety of a chinese herbal medicine formula [RCM-104] in the management of simple obesity: a randomized, placebo-controlled clinical trial. Evid Based Complement Alternat Med 2012: 435702.
  107. Genta S, Cabrera W, Habib N, Pons J, Carillo IM, et al. (2009) Yacon syrup: beneficial effects on obesity and insulin resistance in humans. Clin Nutr 28(2): 182-187.
  108. He RR, Chen L, Lin BH, Matsui Y, Yao XS, et al. (2009) Beneficial effects of oolong tea consumption on diet-induced overweight and obese subjects. J Chin Integr Med 15(1): 34-41.
  109. Abidov M, Ramazanov Z, Seifulla R, Grachev S (2010) The effects of Xanthigen in the weight management of obese premenopausal women with non- alcoholic fatty liver disease and normal liver fat. Diabetes Obes Metab 12(1): 72-81.
  110. Razquin C, Martinez J, Martinez-Gonzalez M, Mitjavila M, Estruch R, et al. (2009) A 3 years follow-up of a Mediterranean diet rich in virgin olive oil is associated with high plasma antioxidant capacity and reduced body weight gain. Eur J Clin Nutr 63(12): 1387-1393.
  111. Li Z, Song R, Nguyen C, Zerlin A, Karp H, et al. (2010) Pistachio nuts reduce triglycerides and body weight by comparison to refined carbohydrate snack in obese subjects on a 12-week weight loss program. J Am Coll Nutr 29(3): 198-203.
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