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The HHS secretary has pressured food companies like Mars, which makes M&M's, to stop using artificial dyes. Easier said than done. This episode was produced by Hady Mawajdeh, edited by Jolie Myers, fact-checked by Gabriel Dunatov, engineered by David Tatasciore and Bridger Dunnagan, and hosted by Noel King. A close-up image shows a bowl of blue M&M candies. Photo by Peter Macdiarmid/Getty Images. Listen to Today, Explained ad-free by becoming a Vox Member: vox.com/members. New Vox members get…