Eating too much without consuming leads to obesity, that is, the calories obtained from food exceed the calories consumed, and the excess calories are converted into fat and accumulated in fat cells, forming obesity.

2.

Diet leads to obesity. When I was a child, I didn't pay attention to the result of losing weight. The human body produced too many fat cells, which will not increase in adulthood. ...

3.

The decline of metabolism leads to obesity after middle age, because the metabolic rate decreases; The nutrition is not balanced, only eating meat and junk food. ...

4.

Heredity leads to obesity. The whole family is fat, not necessarily inherited, but also related to your family's eating habits.