Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM). Weight loss is common in tuberculosis. To gain weight give him high protein and caloric diet. High proteins are found in cheese, soyabean, pulses, eggs without yolk and non veg meals. It is also available in artificial made products available in market like whey proteins. Also he can take appetizer like cyprohepatadine which can increase his appetite For flatulence: 1. Avoid carbonated drinks, wine or beer 2.Avoid smoking if he do 3. take black tea and add cardamom and ginger to it and take them with meals 4. Don t forget to close mouth while chewing food 5.Eat slowly 6. Take a proton pump inhibitor along with a prokinetic agent 7. Take Tablets that contain enzymes protease, amylase, lipase with meals Take tablet Gasex I hope I have answered your query and this will help you. Remain in touch and get-well soon.