Con: Vitamin and Mineral Deficiencies
Since the keto diet is so low in carbs, many people cut carbs by cutting out whole grains and fruit. Even though fruit contains sugar and should be eaten in moderation (i.e., you shouldn't have 17 bananas a day), it's still an excellent source of fiber, vitamins, and minerals. And if you're more focused on eating fats and protein, you may neglect eating the daily recommended amount of veggies and skip out on those important nutrients.
"You may end up with a diet that's deficient in some vitamins and minerals," says Katherine Brooking, MS, RD, cofounder of Appetite For Health.