6. The main structural material of the body is (A) lipid. (B) carbohydrate. (C) protein. (D) minerals.

3. If a total of 2000 kcal were consumed (250 grams of carbohydrates, 66 grams of fat, and 102 grams of protein), what percentage of energy comes from carbohydrates, fat, and protein? (A) 30% carbohydrate, 50% fat, and 20% protein (B) 50% carbohydrate, 35% fat, and 15% protein (C) 20% carbohydrate, 30% fat, and 50% protein (D) 50% carbohydrate, 30% fat, and 20% protein