Opportunities and options for the effective mass of the body with abundant nutrition

Hello I wanted to ask I can't gain weight. I eat very well. How can I gain weight please tell me?

Response: "Hello! The causes of underweight are very different – from genetic, to hormonal. I recommend to start with a visit to the endocrinologist, for some pathologies (for example Edisonova disease), the deficit weight will be obvious. Furthermore do not ignore the genetic factor, if Your parents, grandparents did not differ more weight, you should not expect it from yourself. If no obvious problems, visit a nutritionist, You need energy, the amount of incoming calories during the day should be more than it took in. I wish you health"