How do i become fatter?

Eat more: If you are really talking about gaining weight, then the answer is to increase your calories. If you are talking about getting bigger, then work out to build muscle and eat more calories.

Eat healthy high : Calorie foods. Eat 6 meals/day. Work on strength training to build your large muscle groups. Workout w heavier weights w fewer repetitions. Sleep at least 8 to 9 hrs/night. Hydrate well w water. Foods to help w healthy weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, avocados, granola, trail mix, dried fruits, extra virgin olive oil, canola oil, protein shakes, .