Eat more calories than you burn
Increase portion sizes at meals
Eat more frequently throughout the day
Choose calorie-dense foods
Add healthy fats to meals
Drink calorie-containing beverages
Include protein with every meal
Eat carbohydrate-rich foods
Snack between meals
Avoid skipping meals
Reduce unnecessary physical activity
Strength train to build muscle mass
Track your calorie intake
Aim for consistent weight gain over time
Consult a doctor or dietitian if weight gain is difficult