2. Excessive weight loss can cause psychological problems. Excessive weight loss can easily lead to anorexia nervosa. Studies have shown that the serum testosterone level of male anorexia nervosa patients is usually lower than the normal level. Research shows that people who lose weight excessively have low sexual desire and immature sexual physiology, often feel guilty and self-reproach about their sexual feelings and behaviors, and are prone to psychological conflicts. Although they can participate in sexual activities, they cannot enjoy sexual pleasure. Especially after some people lose weight, they think that the past contradictions are gone forever, but they will be disappointed if they find that they are not, especially if their partners do not make enthusiastic returns, and their self-confidence will be hit hard. It can be seen that men should lose weight scientifically under the guidance of doctors, and at the same time pay attention to maintaining a healthy psychological state.