What are some of the health problems associated with undernutrition? Explain the cycle of malnutrition. Who does it impact?
http://www.google.com/search?q=malnutrition&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
Lots of information in these webpages.
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In addition to Writeacher's suggestions for sites, you may also want to check this site for undernutrition.
http://www.merck.com/mmhe/sec12/ch153/ch153a.html