As with all new ways of eating, figuring out what you can and can't eat on theketogenic diet is more than a little confusing. Fats? Most are in. Carbs? Most are out. The keto diet reduces the amounts of carbs you eat, replacing most of them with fats. You should always consult your doctor before taking on such an extreme new meal plan, but once you've received the go-ahead, you can use this guide so you know exactly which foods you should stock in your pantry and fridge.