Fish

Fish is an important food item on our list of food to gain weight fast. Seafood, like Salmon, is rich in omega fatty acids that contribute towards brain functioning.

Six ounces of salmon will contain about 240 calories, making it a good choice for those looking to gain weight. It also contains many nutrients, including omega-3 and protein. 

A homemade butter garlic salmon is delicious. Make it with the following recipe:
Arrange salmon fillets and broccoli florets on a lightly greased sheet pan.
Prepare the butter sauce.
Rub the minced garlic over the salmon fillets and pour the butter mixture over the salmon and broccoli.
Squeeze lemon juice over everything and season with salt and pepper.
Bake salmon in a preheated oven for 15 minutes, or until salmon is cooked through and flakes easily with a fork.