Bananas on your cereal. Strawberry shortcake. Lip-smacking apple slices dipped in peanut butter. With treats as sweet as these, why do we grumble and groan when the doctor reminds us to eat more fruit? It's a gold mine for the vitamins and minerals your body needs including vitamin C, which helps prevent the damage that high blood sugar does to cells and arteries. 1. Squeeze more citrus fruit into your cart. Oranges, lemons, limes, and grapefruit aren't just rich in vitamin C, they're surprising