VitainstaBio Keto : There is no single blueprint for the keto diet, but plans usually call for eating fewer than 50 grams ofcarbohydratesa day. (Wheat bread contains about 16 grams of carbohydrates per ounce, according to the USDA.) Celebrity adherents to the diet include Halle Berry and Kourtney Kardashian. One area where food tracking can be especially helpful, though, is ensuring that you're hitting the right ratios of macronutrients-protein, carbs, and fat.