In order to gain a pound of body weight, you need to consume 1 gram of protein in a daily basis. A high quality protein powder ensures weight gain by supplying your body with the building blocks that are required for its growth. 2.ating greater amounts of food and increasing your protein and calorie intake helps in building muscle mass and thus increasing your weight. It is not advisable to gorge on unhealthy trans-fats like fried chips, cookies and processed foods as these will cause obesity rather than building healthy muscle mass.