Only two U.S. hospitals will let you use nitrous oxide for pain relief during birth

Yes, it was to eat whatever was at hand, but whatever was at hand was stuff that nature provided, not humans, who thought they knew better. “Natural” as in “doing things harmonious to how this universe has developed.” The obesity epidemic stems from the opposite of that- people who are not eating the way nature worked it out for humans. You’re confusing “natural” for “ignorant”. If people ate right, they wouldn’t have to count carbs.