1. Undernutrition: Reducing weight by half in the health management center means that the calories and nutrients consumed during weight loss are not enough to meet the needs of the body, which leads to undernutrition, thus affecting the normal function of the body.

2, energy imbalance: losing weight too fast or restricting diet too much leads to energy imbalance in the body, and the body will start a series of physiological reactions, including decreased metabolic rate, muscle loss, fatigue, and decreased physical function.