Here are some weight-gain suggestions:
Exercise, particularly strength training, can assist you in gaining weight by strengthening your muscles.
Drink smoothies or healthy shakes made with milk and fresh or frozen fruit, and add ground flaxseed for extra nutrition.
Choose nutrient-dense foods: whole-grain bread, vegetables, fruits, dairy products, lean protein sources, and nuts and seeds are all good choices as part of a healthy diet.
Eat more frequently - Instead of two or three large meals throughout the day, eat five to six smaller meals.