In this way the body keeps its balance of water metabolism and avoids over consumption of yang qi.

这样，机体保持自身的水液代谢平衡，避免阳气过度消耗。

Relative debilitation of yang is mainly caused by congenital deficiency, or postnatal malnutrition and endogenous impairment due to overstrain, or consumption of yang qi due to prolonged illness.

阴偏衰主要由于先天禀赋不足，或后天饮食失养和劳倦内伤，或久病损伤阳气所致。