Presently according to his conditions give him more of protein. Milk twice a day. Sprouts daily. Give soya milk often. Can include paneer in veggies. Can give soya sabji or tofu once or twice per week. If non vegetarian then egg white daily. Don't give outside. Food avoid juices. Don't give too much of raw as it causes infection. Give small and frequent meals if vommitting or nausea give coconut water. Give khichdi, Dalia.include dal regularly. Avoid overeating. Can give channa murmura. Try to make happy ambience during eating. Make him do little physical activity or just walk small to feel good.