I take some healthy food every 2or3hours but i can't gain waight. may be matabolic defects.what can i do for gain waight? plese tell me brifely.

Calories meet needs: Eat more calories is the short answer. You can increase calories by just eating more or with products purchased at stores like GNC designed for weight gain. If you are concerned about a metabolic defect please see an endocrinologist to start if the increased calories do not work.

Get a medical eval: Eat healthy foods high in calories. Eat 6 meals /day. Work on strength training to build large muscle groups. Work out w heavier weights w fewer repetitions. Sleep at least 8 to 9 hrs/night. Hydrate well w water. Foods to help w weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, avocados, granola, trail mix, dried fruits, protein shakes & bars, lean meats, poultry