The adult body contains about two to three grams of zinc. It is found in organs, tissues, bones, fluids, and cells. Foods with high protein content, specifically animal protein, are major sources of zinc in the human diet. Zinc can also be used as fortification for other foods as well. Nearly half of the world's population is at risk for inadequate zinc intake. The article reviewed numerous studies that showed a relationship between zinc and vital human physiological processes such as the following: Beef, lamp, sesame seeds, pumpkin seeds, lentils, beans, cashews are main zinc containing foods

Brain: The blood zinc level is less in patients with Alzheimer's and Parkinson's disease In a rodent study, it was observed that zinc behaves like an antidepressant

Cardiovascular System: Zinc performs a noteworthy role in the regulation of arterial blood pressure. Males and females were reported to metabolize zinc differently when suffering from hypertension

Liver: Zinc deficiency in the liver occurs not only in those with liver cirrhosis, but also in less advanced alcoholic and nonalcoholic liver disease

Pregnancy: A mild deficiency of zinc during a pregnancy can cause increased maternal morbidity, abnormal taste sensation, prolonged gestation, inefficient labor, atonic bleeding, and an increased risk to fetuses

Diabetes: Zinc is very important in the synthesis, storage, and secretion of insulin . A low level of zinc has been shown to play a role in diabetics with associated disease conditions such as coronary artery disease and several related risk factors including hypertension, and elevated levels of triglycerides

Endocrine System: Studies show a correlation between zinc deficiency in geriatric patients and reduced activity of the thymus gland and thymic hormones, decreased response to vaccinations, and reduced immunity

Healing: Zinc deficiency has been linked with delayed wound healing, and has been found to be crucial to the healing of gastric ulcers especially at the early stage

Pneumonia: Zinc may shorten the duration of severe pneumonia and time in the hospital

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