Zinc has many different functions in the body and low levels can cause many different problems.  Some problems related to zinc deficiency include, PMS, excema, low immune system function,  and memory problems.  Zinc is also considered an anti-oxidant along with Vitamin C, selenium, Vitamin E and Co-Q10. 

Because if has such a wide effect on many different systems you need to make sure that you are getting your daily dose of Zinc.  A dose of 30mg per day is considered safe.  Foods high in Zinc include Oysters, whole grains, nuts and seeds.