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To increase the body weight and muscle mass in your body , you need to have a diet which is high in protein.
Proteins are the building blocks in the body.Include more of whole pulses, legumes, milk products, soya products, peanut butter, nuts and dry fruits, chicken , red meats in your diet. Aviod junk foods, oily foods, carbonated beverages, alcohol,saturated sweets which will eventually suppress your hunger, substitute with fruit milkshakes, chicken / tuna sandwich,boiled pulses like rajma, chole,paneer tikka, tofu sandwiches,dry fruit milkshakes, lassi, buttermilk, whole milk, groundnut chikki/ burfi, green banana and can also use supplements of protein which can be taken along with milk. Several protein milkshakes are available in the markets, best is soy flavoured milk which is very high in protein and low in fat. Along with diet, exercise for musle building is necessary.