For the most recent agrarian part of our development there have been carbohydrate-rich foods but there were ways of consuming the carbs that made them healthier for us than what we do today. A keto diet is also very low in allergens and does not contain anti-nutrients that vegetarian proteins contain. No other mineral source is as healthy or as sustainable. And no other nutrient group is as essential for human health and longevity.
https://www.nutriminimart.com/fitcore-life-keto/