In a vegan cafe in New York City, Nisha Moodley pushes a glass crusted with the remnants of a berry-acai-almond milk smoothie across the table and begins listing the foods she excised from her diet six years ago. “Factory-farmed meats; hormone-laden dairy; conventional nonorganic fruits and vegetables; anything hydrogenated; anything microwaved,” the slender 32-year-old health [...]