Core hypothesis

• In human practice, the carnivore diet is animal-fat-based nutrition, not a protein plan.
• Amber’s 2009 shift from long-term low-carb eating to carnivore eating brought weight loss and ended mood-disorder symptoms and medication.
• Human traits—large brain, upright gait, grip, short acidic gut, low fermentation, and unusual fatness—fit a fat-specialized animal-food model.
• Grain-based societies are recent in human history, so grain-centered assumptions shape human physiology work.

Human divergence and fat-first foraging

• Chimpanzees are a poor model for Homo because the Pan line and Homo line split more than five million years ago, and closest living relatives can have very different physiologies.
• Thompson and colleagues separate chimpanzee small-prey hunting from Homo large-animal exploitation.
• Chimpanzees use hands, teeth, and canines in forests for small prey that mainly adds protein and micronutrients.
• Homo exploited large prey in dangerous open settings with tools, and the special payoff was access to large fat stores.
• Percussive scavenging of bones and skulls gave australopithecines marrow and brains before flaked tools became central.
• Bone and skull contents supplied compact, persistent, portable, high-energy fat and brain-specific nutrients.
• Stone flakes arose as byproducts of pounding, then made attached meat easier to use, creating a path from fat scavenging to butchery and hunting.
• The gateway into the human predatory pattern was fat.

Energy constraints

• Humans lost the digestive equipment for a fiber-based energy strategy: the colon and cecum are small next to other primates.
• Bone isotope work puts Homo at a high trophic level, with meat intake high enough to trouble protein-centered nutrition models.
• Protein alone fails as a human energy base; rabbit starvation shows lean meat without fat leads to diarrhea, headache, lassitude, discomfort, and unsatisfied hunger.
• Cats can run brains from protein-derived glucose, but humans cannot take most calories from protein without problems.
• Carbohydrates from tubers were limited by late widespread cooking, low raw glucose availability, toxins, and heavy processing demands.
• With fiber and protein limited and carbohydrates unreliable, animal fat remains the workable ancestral energy source.

Human fatness, infant brains, and ketosis

• Even lean humans carry two to three times more fat than other comparable adult primates, and human babies are unusually fat.
• Human infant fat is largely subcutaneous, differently distributed, and matched to high brain energy demand.
• Humans rank high in encephalization, and infants devote more than half of their energy to the brain.
• Human babies combine relatively larger brains, more fat, and stronger ketosis than adults.
• Cahill’s graph shows newborns and infants enter ketosis faster than older children and adults during fasting.
• Ketone-focused infant brain work ties neonatal energy, breast-milk medium-chain fats, octanoic acid use, and brain lipid/cholesterol building to ketosis.
• In humans, ketone use is not merely starvation fuel: the brain can use ketones whenever supply is available.
• Therapeutic epilepsy diets show many people can maintain seizure control and mild ketosis without protein or calorie restriction when carbohydrate is low and fat is high.
• Body fat increases ketogenic capacity because stored fat can enter circulation between meals.

Final lipovore model

• The human brain began with simple fat-access tools, large-animal carcasses, and a dietary shift away from fiber.
• Humans evolved greater fat storage, ketone generation, and ketone use under ordinary fed and fasting conditions.
• The lipovore is a human specialized for animal fat as a central fuel.
• Fat-centered infant-brain biology makes sugary grain-based weaning foods, low-fat guidance after age two, and Ancel Keys-era anti-fat policy look biologically backward.

References

• [03:45] Origins of the Human Predatory Pattern: The Transition to Large-Animal Exploitation by Early Hominins — https://doi.org/10.1086/701477
• [15:20] The Fat of the Land — https://archive.org/details/fatofland0000stef
• [20:40] Survival of the fattest: fat babies were the key to evolution of the large human brain — https://doi.org/10.1016/S1095-6433(03)00048-5
• [23:20] Fuel Metabolism in Starvation — https://doi.org/10.1146/annurev.nutr.26.061505.111258
• [23:50] Ketones and brain development: Implications for correcting deteriorating brain glucose metabolism during aging — https://doi.org/10.1051/ocl/2015025
• [25:45] Brain fuel metabolism, aging, and Alzheimer's disease — https://doi.org/10.1016/j.nut.2010.07.021
• [27:05] The Modified Atkins Diet in Refractory Epilepsy — https://doi.org/10.1155/2014/404202

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