Shopping last week in her local New York City grocery store, Elise Mackin, 32, filled her cart with items she knows to be good for her family whole grains, fruits and veggies and shied away from products that contained less wholesome ingredients. “Trans fats are out,” she said, “and anything with high-fructose corn syrup.” The evils of trans fats are well known, but what’s wrong with high-fructose corn syrup?