Whole Foods helped create the market for natural, healthy food­—and in doing so “set a standard for grocery stores,” says New York University food studies, nutrition, and public health professor Marion Nestle. The Austin-based grocer prompted giants from Walmart to Kroger to up their organic game. Whole Foods continues to push for change through initiatives like its animal-welfare standards, its refusal to sell overfished seafood, and its requirement that all products it sells containing genetically modified ingredients be labeled as such by 2018.