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Phytatesâwhich are present in whole-grain breads, cereals, legumes, and other foodsâbind zinc and inhibit its absorption [2,12,13]. Thus, the bioavailability of zinc from grains and plant foods is lower than that from animal foods, although many grain- and plant-based foods are still good sources of zinc [2].
Food Sources of Zinc. The best way to avoid consuming too much zinc is to avoid taking dietary supplements. Focus on eating zinc-rich foods instead. Good sources of zinc include beef, shellfish such as crab or lobster, chicken, cheese, milk and kidney beans. A 3-ounce serving of roast beef provides 7 milligrams of zinc, or about 47 percent of an adult's RDA of zinc.