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Americas focus on nutritious eating began to receive national attention in the 1940s when President Roosevelt introduced the RDA, or Recommended Daily Allowance (RDA) model. This model, which took on the shape of a pyramid in the 1980s (and hence now goes by the term food pyramid), has gone through a number of iterations since its inception more than 60 years ago[i]. This change and evolution of the RDA model is, in many respects, a positive step. It demonstrates that, just as Americas information on diet and nutrition is advancing, so too are the models that guide its eating habits.
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