I have neurofibromatosis nf1 and i'm struggling to gain weight i eat a lot more than normal people but still can't seem to gain any weight. i'm u/wigh?

See Dr., then eat...: If one is truly underweight (based on height, family background, and body type), a Dr. can evaluate for a hormonal, digestive, or other disorder. If no medical cause is found, then one can add weight by eating more calories of nutritious foods, while also doing weight-training to increase muscle. Proteins: egg white, chicken breast, salmon,... Better fats: olive oil, peanuts, almonds, tofu,...

Endocrinologist: input is what you need, ask for a referral, best wishes