Prehistoric humans used tools to extract ketogenic, low-deuterium bone marrow. Our natural metabolic state is ketosis. Eat grass-fed animal fats. We adopted agriculture and chronic diseases appeared on a mass scale Dr. László Boros: "Four million years ago, and this was a big finding for me, papers that published that actually the prehistoric man was able to open the skull of large plant-eating animals and start eating bone marrow fat. That's what humans were eating and consuming for themselves for millions of years. […] These prehistoric men were able to go in a ketogenic, deuterium-depleted diet which provides nutritional ketosis and metabolic ketosis with low deuterium. […] They were able to develop brain skills, fine motor movements, fine kind of hand speech. They were able to use their body in a low-deuterium environment in a more flexible, more expressive, and in a more complicated complex way, as far as memory, as far as communications, as far as social behaviors, and so on. And that was all dependent on low-fat, ketogenic diets that they were obtaining from large, plant-eating animals carcasses. "Now, the other advantage of this is that they didn't have to chase, they didn't have to hunt, they didn't have to be exposed to predatory animals by competing for these preys. They just waited until the predators left, and the scavengers left, and the bones were kind of cleaned up for them just to break through those bones using stone tools. That's what they found in this Ethiopian land where they found these 3.8 to 4 million years old bone structures of large plant-eating animals that were actually broken into using tools. "So if you look at for example a mammoth, or if you look at like large plant-eating animals, they have about 20 kg of bone marrow in any of those big bones. So those were actually very reliable, good untouched food sources; they just had to learn how to use tools to get to this ketogenic, low deuterium fat source. […] "So as our natural metabolic profile is ketosis, they could maintain ketosis during the day, low deuterium ketosis, this is what we should do, by the way, this is our natural metabolic state. […] "Agriculture came along about 10,000 years ago, and they started cultivating plants that are higher in deuterium. They formed larger communities and they started harvesting and eating plants, and that's where chronic diseases, and that's where diseases appeared in mass scales as we know. And this is when infectious diseases appeared also, because infectious diseases also depend on deuterium for the propagation of infectious agents. And changing dieting behaviors changed the disease landscape on mankind and societies, and we ended up where we are now. "Most people eat processed food, and if you look at the kind of the general health or the chronic disease epidemics taking place on this entire planet you can tell there is a huge devastating change, and practically it's because of the environmental exposure and also the food. The food industry does not measure deuterium, they don't really label the deuterium, and they don't really care about deuterium, meaning that practically you're left alone, you have to figure out yourself where to find low deuterium food source, and those are grass-fed animal fat, practically." Dr. László Boros with npub1yd2h2lrwchshvm46jq7auh65tjkxmgnapkavh7tjtqq07kknupxsa980tv @ 59:34–01:05:26 (posted 2023-11-28) https://youtu.be/U6nw_3m_k74&t=3574