Question

Among the following, which is the most important strategy for an underweight person who wishes to achieve a healthy body weight?

Answer 1

The most important strategy is high-calorie diet plus regular exercise.
Given that this person wants to gain weight, it is important to amp up the daily intake of calories, because calories cause us to gain weight in the first place. Also, regular exercise is quite important to get rid of fat, and leave muscle in its stead.