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Excellent posts about food safety and nutrition from Marion Nestle, the Paulette Goddard Professor of Nutrition and Food Studies at New York University.
The United States Department of Agriculture's nutrition education site offers links to nutrition databases, diet plans, and personal health tracking applications.
Includes 1) Basics of Metabolism, 2) Digesting Food, 3) Growth Curves, 4) Cycle of Malnutrition totaling approximately 40 minutes of video. Hosted on the Khan Academy site.