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Take a look at your fingernails. Do you see a bunch of white flecks? If so, you may have a zinc deficiency. As many as half of us are zinc deficient – and zinc is needed to convert food into cellular energy. Zinc also improves your sense of smell and boosts your immune system. So, ask your doctor about popping a zinc supplement – or add these zinc-rich foods to your diet: Oysters, liver, roast beef, pumpkin seeds, lamb, peanuts, and Alaskan King Crab.