Here are some links of interest that you may find informative. FIZZIOLOGY is not responsible for the content of the following websites.

  http://www.nutrition.org  
  www.nutrition.org  
     
  http://www.nal.usda.gov/fnic/  
  www.nal.usda.gov/fnic  
     
  http://www.wvda.org/nutrient/  
  www.wvda.org/nutrient  
     
  http://www.webmd.com  
  www.webmd.com