I eat a lot, but still m underweight. my age is 22 and my weight is 40. I am irritated with the problems of my stomach, i.e. few days loose motion and few days constipation with gastric problem. This cycle goes on. I am hosteler so i can't expect healthy food from my hostel. Kindly suggest me for a proper diet, that if I follow then can gain some weight. Also m unable to digest milk and egg especially in summers. Kindly Help me.