Hunger Term Paper Example | Topics and Well Written Essays - 750 words

Hunger - Term Paper Example Animals that have lesions in ventromedial hypothalamus become obese. Further studies revealed that even though these hypothalamic centers are crucial in managing hunger and satiety, they are not absolutely responsible for the hunger behavior. Environmental factors considerably affect hunger or food intake. Pregastric Factors are also crucial here. Visual appearance of food and taste or odor of food influence hunger and food intake. Learned aversions and preferences also affect food intake. Psychological factors like  sadness, fear, anxiety, depression, happiness and social interactions can also influence food intake. Gastrointestinal and Postabsorptive factors also control hunger and eating behavior. The amount of gastrointestinal fill is a key factor that describes the behavior of digestive tract. A full intestine or a full stomach brings satiety. This is through the vagus nerve that sends the information back to the hypothalamus. Apart from that, the enteric hormone cholecystokin in is set to stimulate satiety. When nutrients like amino acids and glucose are properly absorbed, their levels rise in blood. This also makes the hormone levels increase in concentration in blood. Concentrations of hormones like insulin, glucagons and cholecystokinin increase. These changes influence the feeling of hunger and satiety. Obesity is considered genetic to a certain extent. Not every obesity case is caused by genetics. Overeating and lack of exercise can cause obesity. There are several other factors that cause obesity. However, the chief culprit of obesity is genetics. Relation between genetics and obesity has been proved by a research performed on twins who were brought up in different places. The research analyzed the influence of environmental factors and genetic factors that influence obesity. Studies brought the results that genetic factors account for more than forty percent of obesity reasons in children and adults. Even though genetic factors are not