Hidden danger 1: Excessive weight loss This is an era where thinness is regarded as beauty. People who were not originally obese have also joined the weight loss team, including many men. Research by American scientists shows that women must have a certain amount of fat to maintain normal physiological metabolism. Too little fat can easily cause amenorrhea. Similarly, Physiological Metabolism found in studies on male sexual function that the amount of fat can also affect fertility. Men who are underweight and have lost fat tissue can impair their sexual performance. As weight loss continues, prostatic fluid decreases and sperm motility is affected. Methods to eliminate harm: treat weight problems correctly, scientifically