Well, Its been discover over 100 years ago.
<span>A nutritionist or dietitian can provide an athlete with a customized menu or diet plan while they are training. Nutritionists and dietitians specialize in understanding food groups and their effects on the body. By knowing the goal of the athlete (i.e. slim down for running, bulk up for weight lifting), the nutritionist or dietitian can offer suggestions on foods to maintain a healthy lifestyle while building muscles.</span>
Google it and you may find your answer
