Is Excess Zinc Harmful to the Human Body? Its Effects

Is zinc harmful to the human body?

Hello, Dietitian Shi Guimei: I would like to ask if excessive intake of zinc and phosphorus can be harmful to the human body.
What exactly is zinc? Thank you for your assistance.

Zong Long, 30~39 year old female. Ask Date: 2002/09/09

Dr. Shi Guimei reply Nutrition

Dear Mr.
Zonglong,
I was surprised by your mention of the relationship between lead and human health, as lead is typically used in industrial applications such as cosmetics and paints.
Although it is possible to be exposed to lead through diet, drinking water, and air, the amounts are generally minimal, and the body can eliminate it.
However, inhaling large quantities of lead can harm the nervous system, blood, kidneys, and reproductive system.

As for phosphorus (P), it is one of the more abundant minerals in the human body and is required in larger amounts.
Foods containing phosphorus are quite diverse, and phosphorus is stored in bones and teeth.
It also helps regulate the body's acid-base balance.
Typically, when phosphorus intake is excessive, the body will automatically excrete the excess.
However, in cases of severe kidney disease, phosphorus retention increases, leading to a decrease in serum calcium levels.
Therefore, it is advisable for individuals with kidney disease to limit their phosphorus intake.
Wishing you and your family peace and happiness.
Sincerely,
Dietitian Shih Guimei
Taoyuan Hospital, Department of Health, Executive Yuan

Reply Date: 2002/09/09

More Info

Zinc is an essential trace mineral that plays a crucial role in various biological functions, including immune response, protein synthesis, wound healing, DNA synthesis, and cell division. It is also vital for maintaining skin integrity and structure. However, like many nutrients, excessive intake of zinc can lead to adverse health effects.

Effects of Excess Zinc
1. Toxicity Symptoms: Acute zinc toxicity can occur when large doses are ingested in a short period. Symptoms may include nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. Chronic exposure to high levels of zinc can lead to more severe health issues.

2. Copper Deficiency: One of the most significant risks associated with excessive zinc intake is the potential for copper deficiency. Zinc and copper compete for absorption in the intestines. High levels of zinc can inhibit copper absorption, leading to a deficiency that can cause anemia and other health problems.

3. Immune Function: While zinc is essential for a healthy immune system, too much zinc can actually impair immune function. This paradoxical effect can increase susceptibility to infections.

4. Neuropathy: Chronic high intake of zinc has been associated with neurological issues, including peripheral neuropathy, which can manifest as numbness, tingling, or pain in the extremities.

5. Gastrointestinal Issues: Excessive zinc can lead to gastrointestinal disturbances, including nausea and diarrhea, which can further complicate nutrient absorption and overall health.

Recommended Intake
The recommended dietary allowance (RDA) for zinc varies by age, sex, and life stage. For adult men, the RDA is about 11 mg per day, while for adult women, it is about 8 mg per day. Pregnant and lactating women have higher requirements. Most people can obtain sufficient zinc through a balanced diet that includes meat, shellfish, legumes, seeds, nuts, dairy, and whole grains.

Supplementation Considerations
While zinc supplements can be beneficial for individuals with a deficiency or certain health conditions (like acne or skin disorders), it is crucial to use them under medical supervision. Self-supplementation without professional guidance can lead to excessive intake and associated health risks.

Conclusion
In summary, while zinc is vital for health, excessive intake can be harmful. It is essential to adhere to recommended guidelines and consult healthcare professionals before starting any supplementation, especially for extended periods. If you suspect a zinc deficiency or are considering supplementation for specific health issues, it is advisable to undergo testing and receive personalized recommendations from a healthcare provider. This approach ensures that you maintain optimal health without risking the adverse effects associated with excessive zinc intake.

Similar Q&A

Is 70mg of Zinc Daily Safe? Impact on Runners and Health

Taking approximately 70 mg of zinc daily from zinc supplements may lead to adverse effects on the body, as the recommended dietary allowance (RDA) for zinc is generally around 11 mg for adult men and 8 mg for adult women. Excessive zinc intake can result in toxicity, which may ca...

Dr. Liu Qiaoyun reply Nutrition
Dear Ms. Lin, The recommended daily intake of zinc for the general population is 15 mg. If you maintain a balanced and normal diet, there is no specific recommendation for you to increase your zinc intake. Your current daily supplementation is 4.5 times the required amount, and ...

Understanding Zinc Gluconate: Safety and Absorption Concerns

Is it true that many zinc gluconate supplements available on the market are synthetic? Will consuming these cause irreversible harm to the body? Is there a possibility that taking zinc gluconate could lead to an inability to absorb zinc in the future, or am I just overthinking th...

Dr. Wu Hongjie reply Internal Medicine
Side effects of zinc include abdominal cramps, loss of appetite, irritability, nausea, vomiting, diarrhea, headaches, and a metallic taste in the mouth. These symptoms usually resolve on their own. Adult males require approximately 11 milligrams (mg) of zinc per day, and the abso...

Is Soaking Zinc Gluconate Tablets Safe? Risks and Considerations

I have been concerned about the virus, so recently I have been soaking Zinc Gluconate tablets in hot water before taking them. I am unsure if there is any risk of toxicity, and I have been doing this for four days.

Dr. Xiao Yongxun reply Family Medicine
1. Zinc is an essential mineral; many enzymes required for biochemical reactions in the body contain trace amounts of zinc, which aids in metabolic processes. Numerous health supplements claim to enhance the immune system, accelerate wound healing, reduce disease risk, assist in ...

Is Zinc Supplementation Safe for Urological Health?

Is it okay to supplement with commercially available zinc vitamins when levels are normal? Will taking zinc cause any burden?

Dr. Xu Weikai reply Urology
Hello, Zinc is generally believed to be beneficial for male hormones and sexual function. Additionally, some believe it may help reduce the occurrence of urinary tract infections. As for the dosage, it is advisable to follow the instructions on the label or reduce it slightly, wh...