Please note that traditional century-old diets have a great track record of sustaining communities, but it's not necessarily the case that the old diets can lea

Please note that traditional century-old diets have a great track record of sustaining communities, but it's not necessarily the case that the old diets can lead to long lifespans given our current levels of food availability. For instance, my grandmother used to tell me that I needed sugar to grow strong, so she added a ton of it to my milk when I was little. Refined sugar wasn't as readily available, or equally cheap, a long time ago so the small amounts of sugar that made sense in the past doesn't make sense today. She meant well, but the old knowledge unfortunately ended up creating a perverse incentive. What you are saying makes complete sense, but it's important to have in mind that when going all-in with "traditional" foods, one still needs to worry about overall intake - the century-old foods can still kill you if your diet isn't balanced.