There are a few genes responsible for generating the leptin, a substance that reaches the hypothalamus, satiety center in order to cause loss of appetite and stimulate the sympathetic nervous system responsible for consuming the energy through the blood in chromosomes. When these genes are altered, leptin does not occur in the correct proportion, in these cases people are stimulated to continue eating more than they would be under normal conditions diseases: some hormonal imbalances are the cause of overweight and obesity, such as hypothyroidism, polycystic ovary syndrome and Cushing’s syndrome. Hypothyroidism is when an insufficient amount of circulating thyroid hormones, usually caused by the thyroid gland that runs below normal. Polycystic ovary syndrome can affect the menstrual cycle, fertility, hormones, insulin production, heart, blood pathways and appearance physical women’s Cushing’s syndrome is the set of signs and symptoms in a person who is subject of continuous and prolonged to an excessive amount of hormones called glucocorticoids (steroids also calls or corticosteroids hormones). Drugs and medications: some drugs can increase the weight in people, they include corticosteroids, antidepressants and anticonvulsants. The use of these medications can increase appetite, making the body to retain fluid with the result of increased weight for this reason. The use of origin tricyclic antidepressants have demonstrated an increase in fat and weight as well as the long treatments based on corticoids. Emotional: Feelings such as depression, anxiety, boredom, stress, etc.
influence some people making these feel an uncontrollable urge to eat and do so compulsively. Psychological: Recent research have transformed the belief that psychological causes may develop obesity, but it is now considered to the contrary, is obesity, which affects the psychological behaviour of persons suffering from obesity, this converted in a vicious circle in which one is promoter of the other. Smoking: there are people who can grow in weight when they stop smoking, the reason for this is because nicotine tends to increase the speed at which the body consumes stored calories, by what tamta people burn fewer calories when they quit smoking.