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Pumpkin seeds

Along with oysters, chickpeas, eggs, and red meat, pumpkin seeds are a great source of zinc, an essential mineral for cellular functions, including immune cell production. Even mild zinc deficiency can suppress immunity.

Get more: Add pumpkin seeds to salads, granola, and oatmeal cookies; grind seeds and add to burgers. Or try this delicious Pumpkin Seed Spread.