1U.S.Department of Health and Human Services,U.S.Department of Agriculture.Dietary Guidelines for Americans 2005[EB/OL].http://www.healthierus.gov/dietaryguidelines/,2005-01-12.
2U.S.Department of Agriculture.MyPyramid[EB/OL].http://www.mypyramid.gov/index.html,2006-02-02.
3Harvard School of Public Health.Food Pyramids[EB/OL].http://www.hsph.harvard.edu/nutritionsource/pyramids.html,2006-07-06.
4The Food and Nutrition Board.Dietary Reference Intakes Table-The Complete Set[EB/OL].http://www.iom.edu/CMS/3788.aspx,2005-05-03.
