Hello there....., Only calories won’t add to your body weight,include the right amount of proteins to your diet.... Have six meals in a day – three big meals and three small. Breakfast, lunch, and dinner should be heavy and calorie-rich..... Eat - Eggs, lean meat, fish, pulses, sprouts, and dairy products that rich sources of proteins. Fish such as tuna and mackerel are rich in oil and are one of the best ways to increase weight.....