Amenorrhea means that girls still have no menstruation until 18 years old, which is called primary amenorrhea; Because of pregnancy, lactation, menopause, menopause for more than 3 months is called secondary amenorrhea. There are many reasons for amenorrhea, and emaciation caused by mental anorexia is one of the important reasons for adolescent amenorrhea.

Clinically, many slim young women suffer from amenorrhea. What's going on here? It turns out that these girls are afraid of obesity, blindly pursue slim and moving, and try to control their diet. As a result, their weight dropped, but then they suffered from malnutrition, weakness, anemia, less menstruation than normal and finally amenorrhea, which affected their health. A normal 18-year-old girl should have at least 20% body fat. According to research, this is the lowest fat level for their future pregnancy, childbirth and breastfeeding. Below this level, primary amenorrhea is easy to cause. Therefore, only women's fat accounts for 30% ~ 50% of their body weight, which can be called obesity.

In a word, it is not a good thing to pursue slimness blindly, because it often leads to malnutrition and amenorrhea, but loses the girl's body-building posture. Young girls who are on a diet are advised not to suffer from "slim for a while and tighten their belts for a while", which will affect their normal physiological function and bodybuilding posture, and even affect their fertility in the future.