How many kilocalories (kcal) are provided by a food containing 30 grams of carbohydrate?

Correct Answer: B

Rationale: The correct answer is B: 120. Carbohydrates provide 4 kcal per gram, so 30 grams of carbohydrates will provide 120 kcal. This is calculated by multiplying the grams of carbohydrate (30) by the kcal per gram (4). Choices A, C, and D are incorrect because they do not reflect the correct calculation based on the energy content of carbohydrates.

Correct Answer: C

Rationale: The recommended fat intake is between 20% to 35% of total daily calories. This range is considered optimal for maintaining a healthy diet. Choice A (10% to 15%) is too low and might not provide enough essential fats for the body. Choice B (10% to 35%) includes an upper limit that exceeds the generally accepted range. Choice D (40% to 55%) suggests a fat intake that is higher than what is recommended, which could lead to health issues if consumed regularly.

Correct Answer: D

Rationale: The correct answer is D. Fat provides 9 kcal per gram, so 22 grams of fat will provide 198 kcal (22g * 9 kcal/g = 198 kcal). Choice A (88) is incorrect because it miscalculates the kcalories. Choice B (132) is incorrect as it does not consider the correct kcaloric value of fat. Choice C (154) is incorrect as it also does not calculate the kcalories accurately based on the fat content.

Correct Answer: D

Rationale: The primary function of protein in the body is to build and repair tissues. Proteins are crucial for growth, maintenance, and repair of body tissues, including muscles, organs, and skin. While proteins can be a source of energy, their primary role is not to supply energy. Regulating metabolic processes and controlling muscle contractions are functions typically attributed to other nutrients and compounds in the body, such as vitamins and minerals.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.