Hi,Thank you for your query. We will be happy to help you. For weight gain, -Eat more calories than your body burns. -Eat lots of foods that are calorie-dense. This includes various nuts and dry fruits, bananas, potatoes, rice, peanut butter. -Drink milk daily. -Consume more proteins and carbohydrates. -Increase your regular meal portions by some amount. -If you eat non-veg food, eat it more often. We are here to guide you. For a detailed and customized diet plan, feel free to leave a message. Eat healthy, stay healthy Regards.