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Answer: Olive oil
Why: Olive oil supplies heart-healthy monounsaturated fats rather than the saturated fats found in butter.
Answer: Sweet potato
Why: USDA figures give raw sweet potato 8,509 micrograms of beta-carotene per 100 grams, just past the raw carrot's 8,285.
Answer: brain
Why: Gram for gram the heart and kidneys run hotter still, at about 440 kilocalories per kilogram a day against the brain’s 240.
Answer: They raise LDL and lower HDL
Why: Trans fats were originally created via hydrogenation to give vegetable oils a longer shelf life and solid texture at room temperature.
Answer: Nine
Why: Both carbohydrates and proteins yield only four calories per gram, making fat by far the most energy-dense macronutrient.
Answer: Plain bagel
Why: USDA figures put a plain bagel near 418 mg of sodium and an ounce of hard salted pretzels near 352 mg, since bread dough needs salt to build gluten.