40 days thin 10 kg is not the key. Relative to the larger weight base, the weight loss of 10 kg is relatively normal. Losing 0.5- 1 kg per week is a relatively healthy weight loss speed. 40-day weight loss 10 kg, that is, the average weekly weight loss 1.25 kg, which is not too fast or too slow, and belongs to the normal range. If you lose more than 2 kg a week, even if you lose weight, pay attention.