Eat more calories than you burn
Increase portion sizes at meals
Add calorie-dense foods like nuts, nut butters, avocado, cheese, and oils
Drink high-calorie beverages like milk, smoothies, and shakes
Eat more frequently throughout the day
Include more refined carbohydrates if needed
Reduce excessive cardio
Limit very high daily activity if appropriate
Focus on strength training to support healthy weight gain
Choose full-fat dairy products
Add snacks between meals
Track calorie intake to ensure a surplus
Prioritize consistent sleep
Manage stress to support appetite and eating consistency
Consult a healthcare professional if weight gain is difficult or unintentional