Drinking soymilk will not make a woman’s menstrual cycle longer. Soymilk is a food with high nutritional value, and the nutrients in soymilk are easily absorbed by the human body. Women who drink soymilk regularly can replenish their bodies with nutrients, but it won’t cause their menstrual cycles to become longer. The reason why many people believe that women often drink soy milk will make the menstrual cycle longer is because of the soy isoflavones contained in soybeans. Although soy isoflavones have a certain estrogen-like effect, but the soy isoflavones content in soy milk is very low, estrogen-like effect on the human body is very little, even if you drink soy milk every day generally will not lead to women’s menstrual cycle change. If a woman’s menstrual cycle is normal and regular, self-adjustment is generally not recommended. If you want to lengthen your menstrual cycle for some reason, you can use medication to regulate it under your doctor’s supervision.