Zinc is an important mineral found throughout the body. It contributes to a large number of bodily processes including wound healing, immune response, growth and development and insulin activity. There is no part of the body that stores zinc, so a regular dietary supply is necessary. Unfortunately, some foods and supplements block zinc absorption. Avoiding these foods and supplements can ensure a healthy level of zinc intake.
Fiber
Dietary fiber is a part of wheat and vegetables that is not typically well digested. Excessive fiber in the diet can inhibit the absorption of zinc by binding to it. This makes the zinc unavailable to the body and it passes out of the body through the intestines. Many grain products, which are high in fiber, also contain phytic acid, which inhibits the absorption of zinc.
Iron supplements
Supplemental iron can inhibit the absorption of zinc when taken at the same time. Supplemental iron is typically non-heme, meaning it is not biologically active like iron found in animal products. This non-heme iron competes with zinc for the cells that absorb the minerals, and the cells have a greater affinity for non-heme iron than for zinc.
Soy Protein
Soy proteins and other legume proteins contain a chemical called phytic acid. This chemical is an inhibitor of trace mineral absorption, including zinc. Additionally, soy protein itself interferes with the absorption of zinc.
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