Keto, Plant-Based or Gluten-Free? Supermarket Chain Introduces Shelf Label System to Make It Easier to Shop by Dietary Restrictions. Posted byStephen J. Bronner July 15, 2019 Leave a comment on Keto, Plant-Based or Gluten-Free? Supermarket Chain Introduces Shelf Label System to Make It Easier to Shop by Dietary Restrictions. Raley’s of Northern California has greatly expanded its system of icons that it says will take the guesswork out of food shopping.