Even zero-calorie sweeteners may have some negative effects, including maintaining a preference for sweet tastes, and increased reward, potentially increasing the risk of overeating and even food addiction. Grass-fed meat tends to be higher in omega-3 fat, conjugated linoleic acid and vitamins, per gram, which theoretically could be a good thing. These animals may also be raised in a more ethical way.
Starchy vegetables contain more digestible carbohydrates than fiber and should be limited on the ketogenic diet. These include corn, potatoes, sweet potatoes and beets. Limit high-sugar fruits too, which spike your blood sugar more quickly than berries and have more carbohydrates (get a full list of low-carb fruits ranked from lowest to highest). Yogurt and cottage cheese are high in protein and calcium-rich.