True Body Keto To dollop on low carb tacos or even use in keto-friendly baking. Strawberries, blueberries, raspberries, blackberries are all okay, but stick to a small serving size; just 1 cup of blueberries could have 20 grams of carbs. A more accurate test, however, is to use ketone detection strips. These strips should come with an easy-to-follow color guide for detecting specific levels of ketones in the urine. True Body Keto Reviews However, raspberries, strawberries, and blueberries provide fiber and antioxidants. Some people believe elite athletes benefit from keto cycling because their bodies use extra carbohydrates as energy to power through difficult workouts and races.