How should we understand the evolving nature of U.S. dietary guidelines? Today on The Gist, Marion Nestle, a professor of nutrition, food studies, and public health at New York University, explains how the committees modify nutritional guidelines. Plus, what can McDonald's learn from Smashburger or Shake Shack? We speak with consultant Barry Klein, the creator of Ronald McDonald. For the Spiel, how Pesca was bit by the radioactive spider. From now until April 6, tweet titles of imaginary movies to @slategist using the hashtag #NotAMovie. Today's sponsor: Stamps.com. Sign up for a no-risk trial and get a $110 bonus offer, when you visit Stamps.com and enter promo code TheGist. Join Slate Plus! Members get bonus segments, exclusive members-only podcasts, and more. Sign up for a free trial today at http://www.slate.com/gistplus

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