Excessive weight loss may lead to hair loss, anorexia, iron deficiency anemia, etc., thus affecting the body. 1. Hair loss: Proteins and amino acids are the nutrients needed for hair growth. Excessive weight loss may lead to insufficient supply of amino acids and proteins in the body, which may result in dry and frizzy hair, and in serious cases, may lead to hair loss. 2. Anorexia: Many women lose weight through dieting, even if they have reached a normal weight, they still continue to control food intake, and some of them even take extreme ways such as vomiting to reduce food intake, which can easily cause anorexia after a long time. 3. Iron deficiency anemia: If you lose weight by excessive dieting, you may suffer from malnutrition, resulting in a lack of iron in the body, thus causing iron deficiency anemia. There are many other adverse effects of excessive weight loss, weight loss should be gradual, in order to ensure that the body is not affected by the premise of scientific and healthy weight loss.