Waist thinning is a manifestation of body weight loss, which may be due to the reduction of body fat, which leads to the narrowing of waist circumference. Body weight loss refers to weight loss caused by reducing fat, water and muscle.

In the process of losing weight, the body will burn its glycogen reserves first, and then consume body fat, including waist fat. When the intake of calories is not enough to meet the needs of the body, the body will consume fat to provide energy for the body, which will lead to the reduction of fat in the waist and other parts.

In addition to reducing calorie intake, increasing exercise can also accelerate the body's weight loss process. Exercise helps to burn more calories, at the same time, it also increases the basal metabolic rate of the body, making it easier for the body to burn fat.

In short, thinning the waist is the normal performance of the body in the process of losing weight. It is healthy to lose weight through a reasonable diet and proper exercise.