Question

your friend tells you that he has been following a low - carbohydrate diet and increasing his protein intake so he has more energy for his running workouts. you tell him that
a he is making a good choice, since protein is the body’s preferred source of energy.
b he should focus on fat intake instead, since fats are the most efficient source of energy.
c his total energy needs will increase with his increasing physical activity, but glucose is the preferred energy source for many tissues, and carbohydrates are an important macronutrient in the diet as well.
d he should also take a daily multivitamin, since vitamins provide the most energy of all nutrients.

Explanation:

The body's preferred energy source is glucose from carbohydrates for many tissues. While fats are a concentrated energy source and protein has other important functions, it's not the top - choice for energy. Vitamins do not provide energy. As physical activity increases, energy needs rise and carbohydrates remain crucial.

Answer:

C. his total energy needs will increase with his increasing physical activity, but glucose is the preferred energy source for many tissues, and carbohydrates are an important macronutrient in the diet as well.