Losing weight 1-2 kg per week is considered as a healthy and sustainable weight loss rate. Calculated by losing 0.3 kg per day, the speed of losing 30 kg per day in 100 is far beyond the normal range. Excessive weight loss will lead to malnutrition, muscle loss and decreased metabolic rate. Fast weight loss is usually achieved through extreme dietary restrictions or strenuous exercise, which may have a negative impact on health. It is suggested to take a step-by-step approach to lose weight, combined with a healthy diet and moderate exercise to ensure that the body gets enough nutrition and stays healthy.