First of all, fertility is closely related to nutritional factors, and insufficient or excessive nutrition may lead to male infertility. Under malnutrition, vitamins A, B, C, E, minerals such as calcium, phosphorus and iron, and trace elements such as zinc and selenium are lacking, which leads to the decline of sperm production and vitality.

Animal experiments also show that malnutrition will reduce the amount of semen and fructose content in semen that can provide energy for sperm activity. Overnutrition in adolescence often leads to obesity, which makes pituitary function lose or decrease, and androgen release cannot or decrease. Children are prone to symptoms such as small testicles, small penis, lack of secondary sexual characteristics and feminization, which may lead to infertility in adulthood.

Secondly, long-term consumption of some foods and raw cottonseed oil containing nitrite food preservatives or sulfanilamide food colorants will also lead to a decline in sperm quantity and quality.

Soybean is the "killer" of sperm. A recent scientific study shows that some components in soybean can reduce the number of sperm, thus affecting male reproductive function. Soymilk and soybean yogurt, which many people unanimously admire, have also become foods that can kill sperm.