Correct Answer: C

Rationale: The correct answer is C. Understanding serving sizes is crucial because most people have difficulty estimating the amount of food they eat. It helps individuals accurately track their intake, which is essential for maintaining a healthy diet and avoiding overeating.
Choice A is incorrect because the question focuses on portion sizes rather than specific nutrients.
Choice B is incorrect as it presents an unsupported claim about serving sizes decreasing.
Choice D is incorrect as weighing food portions is not always necessary to check serving sizes; understanding standard serving sizes allows for a more practical approach to portion control.

Correct Answer: A

Rationale: The correct answer is A: provide energy. Nutrients play a crucial role in providing energy for the body's various functions. While they do help in regulating metabolic processes and in building and repairing tissue, the primary function related to energy production.

Choices B, C, and D are incorrect as nutrients are not primarily responsible for controlling cellular wastes, hormone levels, or absorption.

Correct Answer: C

Rationale: Low income is a significant factor contributing to marginal nutritional status due to limited access to nutritious food. While dependence on caffeine or acute illness can impact health, they are not as directly linked to marginal nutrition as low income. The size of the family unit may affect food distribution within the household but is not as directly related to marginal nutritional status as low income.

Correct Answer: C

Rationale: Protein provides 4 kcal per gram.
Therefore, 15 grams of protein will provide 15 grams x 4 kcal/gram = 60 kcal.

Choices A, B, and D are incorrect because they do not consider the caloric value of protein correctly.

Correct Answer: B

Rationale: The correct answer is B: 10% to 35%. For a healthy person, it is recommended that 10% to 35% of their daily caloric intake should come from protein. This range ensures an adequate intake of protein for various bodily functions without overdoing it.

Choices A, C, and D are incorrect because they suggest percentages either below the recommended range (A,
C) or exceeding it (
D), which could lead to nutritional imbalances or health issues.