Hi, I’m Aastha and thanks for joining Live Longer World as I parse through the snake-oil in longevity. On my health stack, you can see my exact collection of non-toxic health products I use (12 categories including sleep, fitness, clean water, lighting, air quality, non-toxic kitchen).
“We’ve actually been losing brain size, and with it, mental ill health has been escalating.”
“Homo sapiens had to be evolving in contact with fresh water, but more optimally with the estuarine regions where they had both fresh water to drink and where they had abundant seafood.”
Unless we pay attention to the importance of the brain and its nutrition, quotes, “We will become a race of morons.” - Dr. Michael Crawford
The human brain is smaller today than it was twenty thousand years ago. Not metaphorically, but measurably, by about the volume of a tennis ball, and it is still shrinking. Professor Michael Crawford has spent fifty years explaining why, and his answer is not genetic. The answer is the lack of a single fat - DHA, an omega-3, found in seafood.
DHA makes up the signaling architecture of every neuron we own, and the brain is so dependent on it that it has used nothing else for this job in six hundred million years of evolution. No DHA, no brain.
What Dr. Crawford has argued since 1972, across more than three hundred papers is that it was not our genes that built our extraordinary brains, but DHA drawn from the sea. It's why, he says, our ancestors could only have become human beside the water, where DHA was abundant, and why the modern retreat from seafood toward seed oils and processed food maps almost exactly onto rising rates of depression, autism, and dementia.
He also makes the case that DHA behaves like a semiconductor inside our head, that the official advice to limit fish in pregnancy has harmed generations, and that the dementia people fear in old age may be set in motion before they are born.
What makes the conversation land is that Dr. Crawford is 97 years old, lucid, and still doing research. He clearly knows something about the brain - the proof is in the pudding! He has authored the popular book The Shrinking Brain: Mental Health is affected by poor Brain Nutrition, has advised the WHO and FAO, and holds Japan’s Order of the Rising Sun for this exact body of work. He has been warning about this since 1972, when his own book on the subject prompted the line that we risk becoming "a race of morons" if we keep ignoring how we feed the brain. The unsettling part is how long this evidence has been sitting in plain view while the people who write nutrition guidelines have looked the other way.
“The brain won’t work without DHA. That’s just full stop.” — Professor Michael Crawford.
What we discuss in this episode:
The fat (DHA) your neurons refuse to run without, and how the brain shrinks when the modern diet starves them of it.
The evidence that human brains have physically lost mass since the Stone Age, and what changed in our diet.
Why Dr. Crawford says the official advice to limit fish in pregnancy is wrong, and harming babies.
How seed oils in nearly every processed food crowd out DHA from our brain cells.
The case that Alzheimer’s and dementia may be set in motion in the womb, even before we’re born!
The wrongly demonized fatty acid that infant formula still leaves out.
Why our ancestors could only have evolved a big brain by living beside the sea.
The claim that DHA works like a semiconductor, wiring our neurons to run on light.
What Dr. Crawford eats at 97, and the simple seafood rule he lives by.
Watch on YouTube, Spotify, or any other podcast platform. Timestamps and related episodes below.
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Timestamps:
00:00 The Brain Food We Stopped Eating
00:32 "Your Brain Won't Work Without DHA. That's just full stop"
04:04 It Wasn't DNA That Made Us Human
06:50 How the Eye Built the Brain
08:00 Why Carnivores Are Sharper Than Herbivores
11:35 The Flowering Plant That Invented Pregnancy
14:22 The Placenta: An Organ Built From One Fatty Acid
15:35 Why Arachidonic Acid Is Wrongly Demonized
18:18 More Astrocytes Than Neurons: Who Really Runs the Brain
21:39 Health Stacked
22:38 DHA vs Arachidonic Acid: Two Different Origins
25:21 How the Fetus Hoards DHA and Rejects the Rest
30:31 Are Seed Oils Actually Starving Your Brain?
32:24 Why the FDA is wrong about Fish in Pregnancy
37:50 Do Fish Oil Supplements Work?
44:15 The Lack of Fish in Pregnancy is causing ADHD and Austism
50:10 Why Governments Only Care About Body Size, Not Brains
52:00 "A Race of Morons": The Warning From 1972
55:04 Does Dementia Actually Begin in the Womb?
59:16 Does the Father's Nutrition Matter Too?
59:40 The Importance of Arachidonic Acid that Infant Formula Leaves Out
01:02:24 How Often You Should Actually Eat Seafood
01:04:05 Can Vegetarians and Vegans Get Enough?
01:05:04 Can Genetics Let You Skip Seafood? The India Case
01:08:00 Why Humans Could Only Have Evolved Beside the Sea
01:11:55 Farming the Sea: What Japan Figured Out
01:17:22 The Collapse of DHA in Chicken and Eggs
01:20:52 Why Corn-Fed Everything Is Lower in DHA
01:22:32 The Semiconductor Theory of the Brain, Explained
01:27:20 What Dr. Crawford's Vision Is Like at 97 years old
01:28:39 The Rare Double-DHA Molecule in Your Retina
01:29:23 Where Dr. Crawford Lands on Saturated Fat
01:31:09 His Advice to Young Scientists: Challenge Everything
01:32:07 Closing: Why This Is a Three-Generation Emergency
For paid subscribers, I will be releasing highlights and practical takeaways from this conversation with Dr. Crawford, so if you want those, please consider upgrading.
