Hi my age 17+ but I am so slim my weight 42 kg. How to gain my body and weight .hight 5.1.

Question

For weight gain, 
1. Have frequent meals at regular interval of 2-3 hrs instead of 3-4 large ones
2. Have more quantity of food at one time
3. Increase nutrient & calorie density of foods by including paneer, cheese, cow/buffalo milk, skim milk powder, peanut butter, ghee, nuts, oilseeds, potato, maida, white rice, malt, premix, fresh fruit juice, mango, banana, jackfruit, raisins, dates, dried figs/plum, peanuts.
4. Practice strength exercises at home/ gym to enhance appetite & increase muscle mass. 
5. Drink 3 litres water daily but not with or just before a meal
6. Avoid skipping meals
7. Avoid empty calorie/junk foods

Pratyasha Agrawal · Accepted Answer

For weight gain, 
1. Have frequent meals at regular interval of 2-3 hrs instead of 3-4 large ones
2. Have more quantity of food at one time
3. Increase nutrient & calorie density of foods by including paneer, cheese, cow/buffalo milk, skim milk powder, peanut butter, ghee, nuts, oilseeds, potato, maida, white rice, malt, premix, fresh fruit juice, mango, banana, jackfruit, raisins, dates, dried figs/plum, peanuts.
4. Practice strength exercises at home/ gym to enhance appetite & increase muscle mass. 
5. Drink 3 litres water daily but not with or just before a meal
6. Avoid skipping meals
7. Avoid empty calorie/junk foods