One medium-size apple is a filling, ready-to-eat snack that is packed with four grams of soluble fiber—17% of the Daily Value (DV), or the amount you need each day. “This is important for colon health and controlling blood sugar levels,” says Elson Haas, M.D., author of Staying Healthy with Nutrition. “It’s also a good source of immune-boosting vitamin C.” Apples also contain quercetin, which has antihistamine and antiallergy properties.
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