3. Check The Nutrition. Fi Ultra Fast Pure Keto nally, also keep nutrition in mind. If the keto snack is heavily processed as many are, and as one aims to replace some of the processed high carb snacks in their eating plan, they are still not always healthy. A chocolate bar is never a good choice, no matter if it is a keto bar or not. So do not lose common sense just because you see the term "keto."