1, winter is a season of slow blood flow and slow metabolism. Because people need more energy to maintain a stable state in winter, compared with summer, they consume less and accumulate fat, so they will gain weight.

2. In winter, because of the cold weather, the amount of outdoor exercise is reduced, which leads to fat accumulation and obesity.

3. The high temperature in summer, like the cold in winter, makes the basal metabolic rate of human body higher than the optimal temperature period, and the increase in consumption caused by the increase of basal metabolic rate makes people thinner;

The high temperature in summer makes people uncomfortable and even irritable. Bad emotions affect the feeding center, leading to decreased digestive function, reduced eating and emaciation.