It was believed at one time that low zinc levels in the bloodstream might be a contributing factor in the onset of Alzheimer's disease.
Medical researchers in Australia decided to test this theory.
The results obtained were quite unexpected and near disastrous.
Several people who had been diagnosed with Alzheimer's were administered a dose of 100mg of zinc daily.
Just two days into the study it was obvious that the mental state of these people was deteriorating rapidly.
It was indeed so serious that the study was stopped at that point to avoid any further damage.
A later study in the USA confirmed the Australian results and it is now recommended that if you have Alzheimer's or are at risk for the disease you should avoid any large doses of zinc above the RDA of 15mg.
It has been demonstrated that zinc in large amounts causes proteins to form clumps of amyloid proteins.
These brain cell destroying clumps are found in the brains of Alzheimer's sufferers.
Aluminum and other trace metals, normally found in the blood, had no effect on the formation of amyloid protein clumps.
Normal amounts of zinc found in the blood are necessary and are found in foods.
Even the small quantities found in multivitamin supplements are quite safe.
Only large and abnormal doses need to be avoided.
Zinc partners with red blood cells to remove carbon dioxide from the blood.
It also contributes to the healing of wounds and benefits cell growth and repair.
In addition it serves to keep normal levels of vitamin A in the blood and helps to properly balance taste and smell functions.
Zinc, in normal amounts in your diet and in supplements, is very necessary for health.
However separate supplements should not be taken if you are at any risk for Alzheimer's disease.
The RDA of 15mg is easily obtained by eating properly.
It is found in sunflower seeds, wheat germ, soybeans, turkey, fish, egg yolks, milk and molasses.
Take care to eat these foods regularly and you will get adequate amounts of this necessary mineral.