The results showed that the husband's semen was weakly alkaline and his wife had more boys. Weak acidity, many wives and girls; It is neutral, and the chances of giving birth to boys and girls are equal. The American Space Medical Research Center has made an investigation on the sex of the children of 148 professional athletes, 64 fighter pilots and 25 astronauts. The results show that 96% of their children are girls, mainly because they consume a lot of energy, so that more acidic metabolites such as lactic acid and cupric acid are accumulated in muscles and body fluids, and the vitality of boys' Y sperm is lost more and faster than that of X sperm, so that their children are rarely boys.

The researchers pointed out that if the husband wants to have a boy, he should keep the body fluid weak alkaline by stopping strenuous exercise and reducing energy consumption; In addition, eat more alkaline foods such as fresh vegetables and fruits every day. If you want to have a girl, you should increase the amount of exercise, often do indoor manual labor and eat more acidic foods, such as rice, fish, meat and eggs, so that the liquid will be slightly acidified.