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Appetite is the desire to eat food items, usually due to hunger. Appealing foods can stimulate appetite even when hunger is absent, although appetite can be greatly reduced by satiety. Appetite exists in all higher life-forms, and serves to regulate adequate energy intake to maintain metabolic needs. It is regulated by a close interplay between the digestive tract, adipose tissue and the brain. Appetite has a relationship with every individual's behavior. Appetitive behaviour also known as approach behaviour, and consummatory behaviour, are the only processes that involve energy intake, whereas all other behaviours affect the release of energy. When stressed, appetite levels may increase and result in an increase of food intake. Decreased desire to eat is termed anorexia, while polyphagia is increased eating. Dysregulation of appetite contributes to anorexia nervosa, bulimia nervosa, cachexia, overeating, and binge eating disorder.
The glycemic (glycaemic) index is a number from 0 to 100 assigned to a food, with pure glucose arbitrarily given the value of 100, which represents the relative rise in the blood glucose level two hours after consuming that food. The GI of a specific food depends primarily on the quantity and type of carbohydrate it contains, but is also affected by the amount of entrapment of the carbohydrate molecules within the food, the fat and protein content of the food, the amount of organic acids in the food, and whether it is cooked and, if so, how it is cooked. GI tables, which list many types of foods and their GIs, are available. A food is considered to have a low GI if it is 55 or less; high GI if 70 or more; and mid-range GI if 56 to 69.
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The relationship between alcohol consumption and body weight is the subject of inconclusive studies. Findings of these studies range from increase in body weight to a small decrease among women who begin consuming alcohol. Some of these studies are conducted with numerous subjects; one involved nearly 8,000 and another 140,000 subjects.
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Peptide YY (PYY), also known as peptide tyrosine tyrosine, is a peptide that in humans is encoded by the PYY gene. Peptide YY is a short peptide released from cells in the ileum and colon in response to feeding. In the blood, gut, and other elements of periphery, PYY acts to reduce appetite; similarly, when injected directly into the central nervous system, PYY is also anorexigenic, i.e., it reduces appetite.
The insulin index of food represents how much it elevates the concentration of insulin in the blood during the two-hour period after the food is ingested. The index is similar to the glycemic index (GI) and glycemic load (GL), but rather than relying on blood glucose levels, the Insulin Index is based upon blood insulin levels. The Insulin Index represents a comparison of food portions with equal overall caloric content, while GI represents a comparison of portions with equal digestible carbohydrate content and the GL represents portions of a typical serving size for various foods. The Insulin Index can be more useful than either the glycemic index or the glycemic load because certain foods cause an insulin response despite there being no carbohydrates present, and some foods cause a disproportionate insulin response relative to their carbohydrate load.
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Dietary Reference Values (DRV) is the name of the nutritional requirements systems used by the United Kingdom Department of Health and the European Union's European Food Safety Authority.
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Hunger is a sensation that motivates the consumption of food. The sensation of hunger typically manifests after only a few hours without eating and is generally considered to be unpleasant. Satiety occurs between 5 and 20 minutes after eating. There are several theories about how the feeling of hunger arises. The desire to eat food, or appetite, is another sensation experienced with regard to eating.
Weight management refers to behaviors, techniques, and physiological processes that contribute to a person's ability to attain and maintain a healthy weight. Most weight management techniques encompass long-term lifestyle strategies that promote healthy eating and daily physical activity. Moreover, weight management involves developing meaningful ways to track weight over time and to identify the ideal body weights for different individuals.
Research into food choice investigates how people select the food they eat. An interdisciplinary topic, food choice comprises psychological and sociological aspects, economic issues and sensory aspects.
Hedonic hunger or hedonic hyperphagia is the "drive to eat to obtain pleasure in the absence of an energy deficit". Particular foods may have a high "hedonic rating" or individuals may have increased susceptibility to environmental food cues. Weight loss programs may aim to control or to compensate for hedonic hunger. Therapeutic interventions may influence hedonic eating behavior.
Expected satiety is the amount of relief from hunger that is expected from a particular food. It is closely associated with expected satiation which refers to the immediate fullness that a food is expected to generate.
Pathophysiology of obesity is the study of disordered physiological processes that cause, result from, or are otherwise associated with obesity. A number of possible pathophysiological mechanisms have been identified which may contribute in the development and maintenance of obesity.
The protein leverage hypothesis states that human beings will prioritize the consumption of protein in food over other dietary components, and will eat until protein needs have been met, regardless of energy content, thus leading to over-consumption of foodstuffs when their protein content is low.
References
- ↑ Holt, SH; Miller, JC; Petocz, P; Farmakalidis, E (1995). "A satiety index of common foods". Eur J Clin Nutr. 49 (9): 675–690. PMID 7498104.
- ↑ "The Satiety Value And Satiety Index". HealthRecon.
- ↑ Mattes, Richard (January 2005). "Soup and satiety". Physiology & Behavior. 83 (5). Elsevier: 739–747. doi:10.1016/j.physbeh.2004.09.021. PMID 15639159.
- ↑ Bolton, R. P.; Heaton, K. W.; Burroughs, L. F. (Feb 1981). "The role of dietary fiber in satiety, glucose, and insulin: studies with fruit and fruit juice". The American Journal of Clinical Nutrition. 34 (2). The American Society for Clinical Nutrition, Inc: 211–217. doi:10.1093/ajcn/34.2.211. PMID 6259919.
- ↑ Duncan, K H; Bacon, J A; Weinsier, R L (May 1983). "The effects of high and low energy density diets on satiety, energy intake, and eating time of obese and nonobese subjects". The American Journal of Clinical Nutrition. 37 (5). The American Society for Clinical Nutrition, Inc: 763–767. doi:10.1093/ajcn/37.5.763. PMID 6303104.
- ↑ Rolls, B J (April 1995). "Carbohydrates, fats, and satiety". The American Journal of Clinical Nutrition. 61 (4). The American Society for Clinical Nutrition, Inc: 960S–967S. doi: 10.1093/ajcn/61.4.960S . PMID 7900695.
- ↑ AJ, Hill; SR, Peikin; CA, Ryan; JE, Blundell (1990). "Oral Administration of Proteinase Inhibitor II From Potatoes Reduces Energy Intake in Man". Physiology & Behavior. 48 (2): 241–6. doi:10.1016/0031-9384(90)90307-p. PMID 2255726.
- ↑ S, Komarnytsky; A, Cook; I, Raskin (2011). "Potato Protease Inhibitors Inhibit Food Intake and Increase Circulating Cholecystokinin Levels by a Trypsin-Dependent Mechanism". International Journal of Obesity. 35 (2): 236–43. doi:10.1038/ijo.2010.192. PMC 3033477 . PMID 20820171.
- 1 2 Holt, S. H.; Miller, J. C.; Petocz, P.; Farmakalidis, E. (Sep 1995). "A satiety index of common foods" (PDF). European Journal of Clinical Nutrition. 49 (9): 675–690. PMID 7498104.
- 1 2 Bekelman, Traci A.; Santamaría-Ulloa, Carolina; Dufour, Darna L.; Marín-Arias, Lilliam; Dengo, Ana Laura (2017-05-06). "Using the protein leverage hypothesis to understand socioeconomic variation in obesity". American Journal of Human Biology. 29 (3): e22953. doi:10.1002/ajhb.22953. ISSN 1520-6300. PMID 28121382.
