1. Abnormal diet. The experience of developed countries confirms that the peak of obesity is the stage of social development from poverty to prosperity, because the availability of food has changed. Scholars believe that in an era when food supply cannot be guaranteed, human beings store the calories they consume to maintain their lives; When the food supply is sufficient, people will eat more food abnormally and form obese people.
2. Genetic factors. Obese people usually have a clear family history, and about 40%-50% of their sons and daughters are obese. If both parents are obese, the probability of children being obese can reach 70%-80%. Studies on twins and adopted children show that genetic factors have a great influence on human obesity. When identical twins grow up in different environments, there is no obvious difference in their weight, but there are significant differences between non-twin brothers and sisters living in the same environment. In addition, the adopted son's weight is not obviously related to the adoptive parents' weight, but closely related to the biological parents' weight. Internationally, scientists' research on obesity-related genes has also confirmed that genetic factors are related to obesity. http://tao.haha.cm/search/ 1JTfqw.html
3. Neuroendocrine factors. The hypothalamus has two nerve centers that regulate feeding activities, one is the satiety center of the ventromedial nucleus, and the other is the hunger center of the ventromedial nucleus. If neuroendocrine disorders and hypothalamic lesions occur, it can cause overeating or anorexia. Animal experiments show that after destroying the ventromedial nucleus, animals eat more and become obese. When people are excessively nervous, anxious and sad, their diet is restrained; in a good mood
When you are free, your appetite increases greatly.
4. Abnormal energy metabolism. Some obese people don't eat much more than normal people, but gain weight. Others eat a lot, but they don't get fat. By overeating, people with normal weight become fat. Compared with people with spontaneous obesity, it is found that the former needs a body surface area of 2700 kcal square meters to maintain their weight, while those with spontaneous obesity only need a body surface area of 1 100- 1400 kcal square meters to maintain their weight. In addition, to induce obesity with a high-fat diet, one person needs 4703 kcm2 of body surface area, and the other person needs 84 17 kcm2 of body surface area. The reason for this difference is that different individuals have different energy metabolism rates. Thin people have the ability to consume energy by generating heat, while obese people do not have this ability or this ability is very poor. But in either case, we can change it through our own efforts.
Change.