National Institutes of Health: Zinc

The following is an article from the National Institutes of Health which was reviewed on September 20, 2011 about the mineral Zinc and I quote:

“Zinc”

Fact Sheet for Consumers

What is zinc and what does it do?

Zinc is a nutrient that people need to stay healthy. Zinc is found in cells throughout the body. It helps the immune system fight off invading bacteria and viruses. The body also needs zinc to make proteins and DNA, the genetic material in all cells. During pregnancy, infancy, and childhood, the body needs zinc to grow and develop properly. Zinc also helps wounds heal and is important for proper senses of taste and smell.

How much zinc do I need?

The amount of zinc you need each day depends on your age. Average daily recommended amounts for different ages are listed below in milligrams (mg):

Life Stage Recommended Amount
Birth to 6 months 2 mg
Infants 7–12 months 3 mg
Children 1–3 years 3 mg
Children 4–8 years 5 mg
Children 9–13 years 8 mg
Teens 14–18 years (boys) 11 mg
Teens 14–18 years (girls) 9 mg
Adults (men) 11 mg
Adults (women) 8 mg
Pregnant teens 12 mg
Pregnant women 11 mg
Breastfeeding teens 13 mg
Breastfeeding women 12 mg

What foods provide zinc?

Zinc is found in a wide variety of foods. You can get recommended amounts of zinc by eating a variety of foods including the following:

  • Oysters, which are the best source of zinc.
  • Red meat, poultry, seafood such as crab and lobsters, and fortified breakfast cereals, which are also good sources of zinc.
  • Beans, nuts, whole grains, and dairy products, which provide some zinc.

What kinds of zinc dietary supplements are available?

Zinc is present in almost all multivitamin/mineral dietary supplements. It is also available alone or combined with calcium, magnesium or other ingredients in dietary supplements. Dietary supplements can have several different forms of zinc including zinc gluconate, zinc sulfate and zinc acetate. It is not clear whether one form is better than the others.

Zinc is also found in some oral over-the-counter products, including those labeled as homeopathic medications for colds. Use of nasal sprays and gels that contain zinc has been associated with the loss of the sense of smell, in some cases long-lasting or permanent. Currently, these safety concerns have not been found to be associated with oral products containing zinc, such as cold lozenges.

Zinc is also present in some denture adhesive creams. Using large amounts of these products, well beyond recommended levels, could lead to excessive zinc intake and copper deficiency. This can cause neurological problems, including numbness and weakness in the arms and legs.

Am I getting enough zinc?

Most people in the United States get enough zinc from the foods they eat.

However, certain groups of people are more likely than others to have trouble getting enough zinc:

  • People who have had gastrointestinal surgery, such as weight loss surgery, or who have digestive disorders, such as ulcerative colitis or Crohn’s disease. These conditions can both decrease the amount of zinc that the body absorbs and increase the amount lost in the urine.
  • Vegetarians because they do not eat meat, which is a good source of zinc. Also, the beans and grains they typically eat have compounds that keep zinc from being fully absorbed by the body. For this reason, vegetarians might need to eat as much as 50% more zinc than the recommended amounts.
  • Older infants who are breastfed because breast milk does not have enough zinc for infants over 6 months of age. Older infants who do not take formula should be given foods that have zinc such as pureed meats. Formula-fed infants get enough zinc from infant formula.
  • Alcoholics because alcoholic beverages decrease the amount of zinc that the body absorbs and increase the amount lost in the urine. Also, many alcoholics eat a limited amount and variety of food, so they may not get enough zinc.
  • People with sickle cell disease because they might need more zinc.

What happens if I don’t get enough zinc?

Zinc deficiency is rare in North America. It causes slow growth in infants and children, delayed sexual development in adolescents and impotence in men. Zinc deficiency also causes hair loss, diarrhea, eye and skin sores and loss of appetite. Weight loss, problems with wound healing, decreased ability to taste food, and lower alertness levels can also occur.

Many of these symptoms can be signs of problems other than zinc deficiency. If you have these symptoms, your doctor can help determine whether you might have a zinc deficiency.

What are some effects of zinc on health?

Scientists are studying zinc to learn about its effects on the immune system (the body’s defense system against bacteria, viruses, and other foreign invaders). Scientists are also researching possible connections between zinc and the health problems discussed below.

Immune system and wound healing
The body’s immune system needs zinc to do its job. Older people and children in developing countries who have low levels of zinc might have a higher risk of getting pneumonia and other infections. Zinc also helps the skin stay healthy. Some people who have skin ulcers might benefit from zinc dietary supplements, but only if they have low levels of zinc.

Diarrhea
Children in developing countries often die from diarrhea. Studies show that zinc dietary supplements help reduce the symptoms and duration of diarrhea in these children, many of whom are zinc deficient or otherwise malnourished. The World Health Organization and UNICEF recommend that children with diarrhea take zinc for 10–14 days (20 mg/day, or 10 mg/day for infants under 6 months). It is not clear whether zinc dietary supplements can help treat diarrhea in children who get enough zinc, such as most children in the United States.

The common cold
Some studies suggest that zinc lozenges or syrup (but not zinc dietary supplements in pill form) help speed recovery from the common cold and reduce its symptoms if taken within 24 hours of coming down with a cold. However, more study is needed to determine the best dose and form of zinc, as well as how long it should be taken before zinc can be recommended as a treatment for the common cold.

Age-related macular degeneration (AMD)
AMD is an eye disease that gradually causes vision loss. Research suggests that zinc might help keep early AMD from worsening into advanced AMD. In a large study, older people with AMD who took a daily dietary supplement with 80 mg zinc, 500 mg vitamin C, 400 IU vitamin E, 15 mg beta-carotene, and 2 mg copper for about 6 years had a lower chance of developing advanced AMD and less vision loss than those who did not take the dietary supplement. In the same study, people at high risk of the disease who took dietary supplements containing only zinc also had a lower risk of getting advanced AMD than those who did not take zinc dietary supplements. More research is needed before doctors can recommend zinc dietary supplements for patients with AMD. However, people who have or are developing the disease might want to talk with their doctor about taking dietary supplements.

Can zinc be harmful?

Yes, if you get too much. Signs of too much zinc include nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. When people take too much zinc for a long time, they sometimes have problems such as low copper levels, lower immunity, and low levels of HDL cholesterol (the “good” cholesterol).

The upper limits for zinc are listed below. These levels do not apply to people who are taking zinc for medical reasons under the care of a doctor:

Life Stage Upper Limit
Birth to 6 months 4 mg
Infants 7–12 months 5 mg
Children 1–3 years 7 mg
Children 4–8 years 12 mg
Children 9–13 years 23 mg
Teens 14–18 years 34 mg
Adults 40 mg

Are there any interactions with zinc that I should know about?

Yes. Zinc dietary supplements can interact or interfere with medicines that you take and, in some cases, medicines can lower zinc levels in the body. Here are several examples:

  • Taking a zinc dietary supplement along with quinolone or tetracycline antibiotics (such as Cipro®, Achromycin®, and Sumycin®) reduces the amount of both zinc and the antibiotic that the body absorbs. Taking the antibiotic at least 2 hours before or 4–6 hours after taking a zinc dietary supplement helps minimize this effect.
  • Zinc dietary supplements can reduce the amount of penicillamine (a drug used to treat rheumatoid arthritis) that the body absorbs. They also make penicillamine work less well. Taking zinc dietary supplements at least 2 hours before or after taking penicillamine helps minimize this effect.
  • Thiazide diuretics, such as chlorthalidone (brand name Hygroton®) and hydrochlorothiazide (brand names Esidrix® and HydroDIURIL®) increase the amount of zinc lost in the urine. Taking thiazide diuretics for a long time could decrease the amount of zinc in the body.

Tell your doctor, pharmacist, and other health care providers about any dietary supplements and medicines you take. They can tell you if those dietary supplements might interact or interfere with your prescription or over-the-counter medicines or if the medicines might interfere with how your body absorbs, uses, or breaks down nutrients.

Zinc and healthful eating

People should get most of their nutrients from food, advises the federal government’s Dietary Guidelines for Americans. Foods contain vitamins, minerals, dietary fiber and other substances that benefit health. Dietary supplements might help in some situations to increase the intake of a specific vitamin or mineral. For more information on building a healthy diet, refer to the Dietary Guidelines for Americansexternal link icon and the U.S. Department of Agriculture’s food guidance system, ChooseMyPlateexternal link icon.

Where can I find out more about zinc?

Disclaimer

This fact sheet by the Office of Dietary Supplements provides information that should not take the place of medical advice. We encourage you to talk to your healthcare providers (doctor, registered dietitian, pharmacist, etc.) about your interest in, questions about, or use of dietary supplements and what may be best for your overall health. Any mention in this publication of a specific brand name is not an endorsement of the product.”

Reviewed: September 20, 2011″

(IF ZINC GOES UP, COPPER GOES DOWN, SO IT IS IMPORTANT TO HAVE THE RIGHT BALANCE BUT IT IS NOT ONE OF THE CHEM TESTS WHERE THEY USED TO HAVE A CHEM 21 TEST AND NOW THEY’VE GONE TO THE CHEM 9 TEST, WHICH IS GOING IN THE WRONG DIRECTION.

LaVern Isely, Progressive, Independent, Overtaxed Middle Class Taxpayer and Public Citizen and AARP Members

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About tim074

I'm a retired dairy farmer that was a member of the National Farmer's Organization (NFO). Before going farming, I spent 4 years in the United States Air Force where I saved up enough money to get my down payment to go farming. I also enjoy writing and reading biographies and I write about myself as well as articles and excerpts I find interesting. I'm specifically interested in finances, particularly in the banking industry because if it wasn't for help from my local Community Bank, I never could have started farming which I was successful at. So, I'm real interested in the Small Business Administration and I know they are the ones creating jobs. I have been a member of Common Cause and am now a member of Public Citizen as well as AARP. I have, in the past, written over 150 articles on the Obama Blog (my.barackobama.com) and I'd like to tie these two sites together. I'm also on Twitter, MySpace and Facebook and find these outlets terrifically interesting particularly what many of these people did concerning the uprising in the Arab world. I believe this is a smaller world than we think it is and my goal is to try to bring people together to live in peace because management needs labor like labor needs management. Up to now, that hasn't been so easy to find.
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