Investigations on Minerasls
Currently, scientists are investigating the influence on
human health of many other trace elements, including chromium, manganese,
cobalt, cadmium, copper, selenium, molybdenum, vanadium, nickel, and fluorine.
Some preliminary evidence suggests that a deficiency of chromium may play a
part in diabetes and, on the other hand, an excess of cadmium may adversely
affect blood pressure.
Even arsenic may be needed by the human body in these
trace amounts. Trace materials occur in water and in soils, find their way into
foods, and may be present in relatively large amounts in some foods, relatively
small amounts in others.
Existing knowledge is still inadequate; there is enough to
suggest the importance of trace materials but far from enough yet to provide a
reliable guide to how much of them the body needs, how much of them can be
dangerous, and their concentrations in various foods. Earlier, the discovery of
the role of vitamins in human health under- scored the need for a balanced diet
that would provide the vitamins. Now the work with trace materials underscores
the need even more.
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