Hello doctor. My age is 23. I am very lean and have low weight. All of my family members are smart and well built. I am very much tensed because of this. I also feel very weak. I masturbate a lot. Is this the reason I am very lean? My friends say if a person masturbates a lot, he becomes lean. Is this true? Please advice me how to put on weight.

Masturbation is normal physiological act. It has no relation with weight. Masturbation never causes weight loss. To increase your weight you should take healthy balance diet, exercise regularly (more of weight training then aerobics) and learn to relax. Worries regarding weight will prevent weight alteration. You may consult Physician to rule out medical conditions like Hyperthyroidism, Anxiety Neurosis etc.