An evidence-based is the accepted way to develop nutrition and health guidelines.
The process is documented, transparent, and reproducible. Another professional that researches the same questions, using the same method should be able to replicate the analysis and reach the same answer.
The steps are
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Lyon, Joan and Dorothea Vafiadis. An Evidence-Based Approach to Reviewing the Science on Nutrition and Health. Center for Nutrition Policy and Promotion, USDA, 2008. Nutrition Insight 38.
A Series of Systematic Reviews on the Relationship Between Dietary Patterns and Health Outcomes. Evidence Analysis Library Division, Center for Nutrition Policy and Promotion, USDA, March 2014.
USDA Nutrition Evidence Library
Brass, P.A. and others. Developing an Evidence-Based Guide to Community Preventative Services - Methods. American Journal of Preventive Medicine. 18 (IS), 35-42
Concato, J. Observational Versus Experimental Studies: What's the Evidence for a Hierarchy? NeuronRx, July 2004, 341-347
Myers, E. Systems for Evaluating Nutrtion Research for Nutrtion Care Guidelines: Do they Apply to Population Dietary Guidelines? Journal f the American Dietetic Association, December 2003, 103(12) (Supply 2) 34-41.
Systems to Rate the Strength of Scientific Evidence. HHS, Agency for Healthcare Research and Quality, April 2002, Publication 01-P022. ahrq.gov/clinic/epcsums/strengfact.htm.