Difference between revisions of "Zinc"

Revision as of 12:40, 23 October 2012

Zinc is found in pumpkin seeds, sunflower seeds, seafood, whole grains, soybeans, and onions. Zinc is very much associated with protein foods. Thus, you may assume that most foods high in zinc are protein-rich as well. The best sources of zinc include beef, lamb, pork, crabmeat, turkey, chicken, lobster, clams and salmon. If you are a vegetarian, you will most probably intake less zinc that those who have meat-based diets. Good zinc food sources aside from meats are dairy products such as milk and cheese, yeast, peanuts, beans, and wholegrain cereals, brown rice, whole wheat bread, potato and yogurt. Of all these vegetarian zinc foods, pumpkin seeds offer one of the most concentrated non-meat food sources of zinc.

• Oysters: Depending on type and variety oysters provide 16-182mg of zinc per 100g serving. This accounts for 110%-1200% of the RDA for zinc. The food highest in zinc is The Steamed Wild Eastern Oyster which provides 182 mg of zinc per 100g serving, or 76mg (509% RDA) in 6 oysters, and 154mg (1029% RDA) in a 3 ounce serving.
• Toasted Wheat Germ : Packed in jars and sold toasted, wheat germ is great to sprinkle on top of any food. Try it on salads, rice, or steamed vegetables. Toasted wheat germ provides 17mg (112% RDA) of zinc per 100g serving, which is 19mg (126% RDA) per cup, and 1.2mg (8% RDA) in a single tablespoon. Crude (untoasted) wheat germ provides 12mg (82% RDA) of zinc per 100g serving, 14mg (94% RDA) per cup, and 1mg (6% RDA) per tablespoon. Click to see complete nutrition facts.
• Veal Liver : The liver of any animal is packed with vitamins and minerals and most commonly served as pâté or liverwurst. Veal liver has the most zinc with 12mg per 100g serving accounting for 81% of the RDA, that is 8.98mg of zinc (60% RDA) in a cooked slice of liver (80g). Liver is best prepared steamed or fried with onions and herbs.
• Sesame Seeds and Tahini (Sesame Butter): Sesame products contain about 10mg of Zinc per 100g serving (70% RDA). Sesame flour can be used as a substitute for wheat flour in cakes and breads. Tahini is commonly found in hummus (a ground chickpea spread and dip of the Middle East) it will provide 4.6mg (31% RDA) of zinc per 100g serving, 0.7mg (5% RDA) per tablespoon. Whole sesame seeds provide 7.8mg/100g (52% RDA), 11mg (74% RDA) per cup, and 0.7mg (5% RDA) per tablespoon.
• Low Fat Roast Beef : Low fat beef shoulder, shank, and chuck all contain about 10mg (70% RDA) of zinc per 100g serving, 18mg (119% RDA) per pound, and 9mg (59% RDA) in a 3 oz serving. If you buy pre-processed roast beef be sure to consult the nutrition facts about the cut and nutrients. Not all nutrition labels report zinc, so don't worry if you don't see it.
• Roasted Pumpkin and Squash Seeds : A popular food in the Middle East and East Asia pumpkin and squash seeds contain about 10mg (70% RDA) of zinc per 100g serving, 6.6mg (59% RDA) per cup, and 3mg (19% RDA) per ounce (~85 seeds). If you can't find these in your local supermarket you will surely find them in Middle Eastern or East Asian specialty stores. Alternatively, you can also save any pumpkin and squash seeds you have and roast them in your oven. The seeds are typically eaten by cracking the outer shell and eating the seed inside.
• Dried Watermelon Seeds : Much like the pumpkin and squash, watermelon seeds are popular in the Middle East and East Asia and they should be in specialty stores catering to those cultures. It is also possible to just eat the seeds raw with the watermelon. You can shell them, or just chew them up whole. Dried watermelon seeds provide 10mg (70% RDA) of zinc per 100g serving, 11mg (74 %RDA) per cup, and 3mg (19% RDA) per ounce.
• Dark Chocolate and Cocoa Powder : Chocolate is showing more and more health benefits and dark chocolate is coming into vogue. Unsweetened baking chocolate provides 9.6mg (64% RDA) of zinc per 100g serving (most bars are 50-100 grams). Cocoa powder will provide 6.8mg (45% RDA) per 100g, or 5.4mg (39% RDA) per cup, 0.3mg (2% RDA) per tablespoon. Most milk chocolates provide around 2.3mg (15% RDA) per 100g serving or 1mg (7% RDA) per bar. Click to see complete nutrition facts.
• Lamb (Mutton) : Lamb is a common meat in the Middle East, Mediterranean, and most of Europe, but is increasing in popularity in the Americas. Lamb provides between 4.2-8.7mg of zinc per 100g serving (28%-58% RDA) depending on cut. That is up to 7.4mg (49% RDA) in a 3 ounce serving (85 grams).
• Peanuts : Peanuts are a great source of zinc, 100 grams of oil roasted peanuts will provide 6.6mg (44% RDA) of zinc, or 8.8mg (59% RDA) in 1 cup chopped, 1.9mg (12% RDA) per oz (~39 peanuts). Dry roasted peanuts will provide half as much zinc at 3.3mg (22% RDA) per 100 gram serving, or 4.8mg (32% RDA) per cup, and 1mg (6% RDA) per oz.

Special Precautions of Zinc

Zinc is LIKELY SAFE for most adults when applied to the skin, or when taken by mouth in amounts not larger than 40 mg per day. Routine zinc supplementation is not recommended without the advice of a healthcare professional. In some people, zinc might cause nausea, vomiting, diarrhea, metallic taste, kidney and stomach damage, and other side effects. Using zinc on broken skin may cause burning, stinging, itching, and tingling.

Taking high amounts of zinc is LIKELY UNSAFE. High doses above the recommended amounts might cause fever, coughing, stomach pain, fatigue, and many other problems.

Taking more than 100 mg of supplemental zinc daily or taking supplemental zinc for 10 or more years doubles the risk of developing prostate cancer. There is also concern that taking large amounts of a multivitamin plus a separate zinc supplement increases the chance of dying from prostate cancer.

Taking 450 mg or more of zinc daily can cause problems with blood iron. Single doses of 10-30 grams of zinc can be fatal.

Zinc nose sprays (Zicam, Cold-Eeze) are POSSIBLY UNSAFE. These products may cause loss of ability to smell. In June 2009, the US Food and Drug Administration (FDA) advised consumers not to use certain zinc-containing nose sprays (Zicam) after receiving over 100 reports of loss of smell. The maker of these zinc-containing nose sprays has also received several hundred reports of loss of smell from people who had used the products. Avoid using zinc nose sprays. Special Precautions & Warnings: Pregnancy and breast-feeding: Zinc is LIKELY SAFE for most pregnant and breast-feeding women when used in the recommended daily amounts (RDA). Pregnant women over 18 should not take more than 40 mg of zinc per day; pregnant women age 14 to 18 should not take more than 34 mg per day. Breast-feeding women over 18 should not take more than 40 mg of zinc per day; breast-feeding women age 14 to 18 should not take more than 34 mg per day.

HIV (human immunodeficiency virus)/AIDS: Do not take zinc if you have HIV/AIDS. Zinc might shorten your life. Note that many zinc products also contain another metal called cadmium. This is because zinc and cadmium are chemically similar and often occur together in nature. Exposure to high levels of cadmium over a long time can lead to kidney failure. The concentration of cadmium in zinc-containing supplements can vary as much as 37-fold. Look for zinc-gluconate products. Zinc gluconate consistently contains the lowest cadmium levels.

The benefits of Zinc are

• A powerful protective agent against prostate cancer. This mineral is also necessary for the formation of RNA and DNA and a healthy immune system. And, you guessed it: a healthy immune system is better able to kill cancer cells. Zinc is vital for prostate health and for male hormone activity. You need zinc to produce sperm and semen. There's more zinc in your prostate gland than any other part of your body.
• Zinc supplementation or dietary intake (from milk, for instance) can help reduce feelings of anger, hostility, and depression
• Zinc lowers systemic inflammation and promotes optimal immune health