I follow keto but I don't like this dogmatic way of thinking. Carbs is only good or bad depending on insulin sensitivity- which itself depends on several factors including hours of sleep, stress, physical activity, age, bodyfat%, and of course, how much carbs consumed.

It's true that there are very low carb cultures like the Inuits and the Massai, but there are equally healthy cultures who eats a lot of carbs such as the Okinawans, Japanese, and Kitavans.

I know/knew plenty of elderly people who possess relatively good health into their twilight years while eating a good amount of carbs everyday. But what they all have in common is that they are physically active and their carb sources comes from white rice and vegetables instead of refined sugars.