People are getting taller. Brains are getting smaller. Average height has climbed decade after decade — driven by higher protein intake. But brain volume tells a different story. We evolved from a chimpanzee brain of roughly 350cc — about the size of your fist — to 1,650cc at our... peak 30,000 years ago. Today we sit at 1,330cc. We've lost almost a chimp brain's worth of volume. And IQ has been declining since 1950. Between 2005 and 2010, five major European public health audits showed brain disorders had become the #1 cost to society. Rising from €386 billion to €789 billion in just five years. Nobody acted. Professor Michael Crawford has spent 50 years studying why. 300+ papers. 95 years old. Still publishing. Still doing podcasts. Still sharp. He remembers that before WWII, the UK served a fish course before the meat course or herring for breakfast. In Elizabeth I's time — roughly 50% of English income came from cod fleets off Newfoundland. Factory workers complained about too much salmon for lunch. East End pubs served free oysters with beer. New York City was once an oyster capital. And even during World War II, when almost everything else was rationed, seafood wasn’t. Every pregnant mother received cod liver oil, orange juice and milk — delivered free by the milkman to her doorstep. 95% of infants were breastfed. The government understood maternal DHA nutrition during the war. Then abandoned it entirely. Fish consumption declined quietly in the decades that followed — pollution, industrialisation, changing food culture. Seafood went from a working class staple to luxury item. And almost nobody noticed — because we were told to track protein intake. But no one told you to track DHA intake. Even chicken — the modern “healthy protein” — has been affected. DHA content of chicken meat dropped from 170mg per 100g in the 1970s to just 13mg today. Chickens used to roam fields eating grubs and green food. Now they’re fed corn. No DHA precursor. The food system changed the nutritional profile of an entire protein source without telling anyone. And here's the problem with that: Your brain isn't built from protein. It's built from specialised fats. Specifically DHA — docosahexaenoic acid — an omega-3 found almost exclusively in seafood. Every mammal maintains a tight omega-6 (ARA) to omega-3 (DHA) ratio of roughly 2:1 or 1:1. Human breast milk is low protein and loaded with DHA. Nature makes the priority obvious. The marine evidence is hard to ignore. A dolphin has 1,700cc cranial capacity. A lion — similar body size — has 340cc. Same body weight. Five times the brain volume. The only difference: the dolphin returned to the sea 50 million years ago. And the human fossil record supports it too. Homo heidelbergensis lived inland. Fish-poor diet. Average brain volume: ~1,100cc. Coastal Homo sapiens eating shellfish — living at the water's edge — reached 1,550–1,660cc. The biggest brains ever recorded in human history. Seafood eaters built larger, more complex brains. And you can't just eat more flax seeds. Crawford proved this biochemically. The ability to convert plant-based omega-3s into DHA is rate-limited — it's a very slow process. As body size increases, the velocity of growth outstrips the biosynthetic capacity. This is why every land-based mammal without exception loses brain capacity as it gets bigger. Squirrels: 2.5% brain to body ratio. Rhinoceros: 0.1%. The land food base simply cannot supply DHA fast enough for large mammals. And DHA isn't just a structural fat. Inside cell membranes it behaves as a semiconducting, UV-absorbing chromophore. Its structure enabled early photoreceptors to convert light into electrical signals — the beginning of the nervous system itself. Your retina uses it. Your synapses use it. Your vision depends on it. Crawford: DHA was so effective for neural signalling that evolution never replaced it. Genomes shifted across millions of years. DHA didn't. In this rare case — the molecule dictated to the DNA. At 95 — Crawford eats seafood five times a week. He is his own proof of concept. No nootropic fixes a structural deficiency in the primary building block of your brain. My playbook: - Seafood five times a week - Oysters once — highest mineral load - Sardines four times - Salmon when available Spend less on supplements. Invest in seafood. Your brain isn't asking for more protein. It's asking for the fat it's built from.show more

no.mind

29,238 subscribers

Share Download