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In the summer of 2013, Özge Siğirci, a young scientist in Turkey, had not yet arrived at Cornell University for her new research stint. But she already had an assignment from her future boss, Brian Wansink: Find something interesting about all-you-can-eat buffets.

As the head of Cornell’s prestigious food psychology research unit, the Food and Brand Lab, Wansink was a social science star. His dozens of studies about why and how we eat received mainstream attention everywhere from O, the Oprah Magazine to the Today show to the New York Times. At the heart of his work was an accessible, inspiring message: Weight loss is possible for anyone willing to make a few small changes to their environment, without need for strict diets or intense exercise.