Stanford Introduction to Food and Health - Massive Open Online Course from Coursera and the Stanford University. The course is free, but a small fee is required for a certificate.
Dietary Guidelines for Americans - U.S. Department of Agriculture. Evidence-based nutritional guidance to promote health, reduce the risk of chronic diseases, and reduce the prevalence of overweight and obesity through improved nutrition and physical activity.
The Institute of Medicine (IOM) is an independent, nonprofit organization that works outside of U.S. government to provide unbiased and authoritative advice to decision-makers and the public.