food chemistry food chemistry

Vani Hari, known as the "Food Babe," speaks at the Green Festival in Los Angeles on Sept. 12. Hari has made a name for herself by investigating ingredients in Big Food products that she deems potentially harmful. But critics accuse her of stoking unfounded fears. Jonathan Alcorn/Bloomberg via Getty Images hide caption

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Jonathan Alcorn/Bloomberg via Getty Images

A tiny selection of the flavor compounds in pumpkin and pumpkin-pie spices is enough to make our brain think, "Ah, pumpkin pie!" when we drink a pumpkin pie latte. Ashley MacKinnon/Flickr hide caption

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Ashley MacKinnon/Flickr