As a "rule of thumb" estimate, male athletes who wish to increase muscle mass should increase daily energy intake by approximately _____ kcal.

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Male athletes who wish to increase muscle mass should increase their daily energy intake by approximately 400-500 kcal. This calorie increase should come primarily from carbohydrates and protein to fuel the body for exercise and to support muscle growth. Increasing calorie intake beyond this recommended range can lead to excessive weight gain in the form of fat, rather than muscle.

As a "Rule of Thumb" Estimate, Male Athletes Who Wish