As an internist in the public primary care clinic at Zuckerberg San Francisco General Hospital, Dr. Hilary Seligman often asked her patients about their diets. One conversation that stands out involved a man in his 50s, a longtime patient she had just diagnosed with prediabetes. Asked to describe his meals, he revealed that his daily lunch was a sandwich of Spam between two cinnamon rolls. [time-brightcove not-tgx=”true”] “It really shocked me,” says Seligman.