When a woman is ovulating, her ovaries will secrete a single estrogen, and the estrogen will reach the highest level. The main role of estrogen is to promote water and sodium retention, and it can also increase the synthesis of high-density lipoprotein in the liver, but it will not affect the woman’s appetite. The increase in appetite during ovulation is considered to be the result of an increase in metabolism, gastrointestinal peristalsis or an increase in the intensity of exercise, resulting in physiological manifestations, which are related to the mood of the woman and the environment, and need to let nature take its course after an increase in appetite during the period of ovulation, without worrying about other undesirable factors leading to the anomalies. If a woman’s appetite increases during ovulation and persists even after ovulation, and is accompanied by symptoms of excessive urination and weight loss, she should be alert to the possibility of diabetes.