Question

In theory, to gain one pound of body weight per week, you d need to consume an additional:

Answer 1

The answer is C. 500 additional calories per day.

Answer 2

In theory, to gain a pound of body weight per week, one must consume an additional 1,000 calories per day. An approximate 3,500 calories is equivalent to a pound of body weight. If a person continuously consumes more than 3,500 calories over a period of time it is expected that this person will gain 1 pound of weight. 

Nutritionists usually suggest that an underweight person should add between 500-1,000 calories per day to encourage a 1-2 pound increase in body weight. Because being underweight sacrifices one's immunity and overall health.