If you want to eat like a Neandertal, you cannot simply eliminate carbs.
For generations, we have imagined our prehistoric ancestors as hunters defined by meat and blood, but the teeth of the dead tell a quieter, more complex story. Scientists examining ancient oral bacteria have found that Neandertals consumed substantial amounts of starch — roots, grains, nuts — long before agriculture gave us bread or rice, suggesting that carbohydrates were not a modern indulgence but a foundational fuel for the expanding human brain. The popular paleo diet, which casts carbs as the enemy of ancestral eating, may be built on a myth as old as the myth it claims to correct.
- Bacterial DNA recovered from 124 ancient teeth — including those of Neandertals — reveals a diet far richer in starch than the meat-centric story of prehistory allows.
- The presence of Streptococcus bacteria adapted to bind with the starch-digesting enzyme amylase points to carbohydrate consumption stretching back at least one hundred thousand years.
- This evidence directly contradicts the premise of modern paleo diets, which restrict carbs in the name of ancestral authenticity — a claim the fossil record no longer supports.
- The real tension is not ancient but contemporary: in a world flooded with processed sugars, the danger is excess and restriction alike, not carbohydrates themselves.
- Scientists and nutritionists are converging on a quieter conclusion — that moderation, whole foods, and a guilt-free relationship with eating are closer to the truth than any elimination diet.
We carry a stubborn image of prehistoric humans as relentless hunters, their survival written in bone and blood. But researchers examining bacterial residue trapped in ancient teeth have found something that complicates that picture: Neandertals, who roamed Europe some two hundred thousand years ago, ate significant amounts of starch — roots, grains, and nuts alongside whatever meat they could secure.
The study, published in the Proceedings of the National Academy of Sciences, analyzed genetic material from bacteria found in the mouths of 124 individuals spanning multiple species, from Neandertals to chimpanzees. Researchers identified bacteria of the genus Streptococcus — microbes adapted to bind with amylase, the enzyme in human saliva that breaks starch into glucose — in both Neandertal and ancestral Homo mouths. Their presence suggests a diet rich in complex carbohydrates long before agriculture existed. The brain, an organ of enormous energy demand, roughly doubled in size between two and seven hundred thousand years ago; starch, it seems, helped pay that metabolic bill.
Plant consumption leaves few traces in the fossil record compared to bone and tooth, which is why meat has dominated our understanding of prehistoric nutrition. Only by studying the microbial communities living in ancient mouths could researchers glimpse what had been invisible.
The implications for modern dietary culture are pointed. Paleo diets claim to reconstruct ancestral eating by eliminating carbohydrates in favor of protein and fat — but the evidence suggests the carbs were always there, and that they mattered. The problem in today's food environment is not carbohydrates themselves but the excess of refined sugars in processed foods, which contribute to obesity, diabetes, and chronic disease. Restrictive diets promise transformation but often produce only the yo-yo cycle. The science points elsewhere: toward moderation, whole foods, and a relationship with eating built on balance rather than fear.
We carry a picture in our heads of prehistoric humans as relentless meat eaters, their diets built on the hunt and the kill. But the scientific record is more complicated than that story suggests. Researchers examining the bacterial residue trapped in ancient teeth have found something that upends the familiar narrative: Neandertals, who roamed Europe roughly two hundred thousand years ago, ate substantial amounts of starch. They consumed roots, grains, nuts, and other carbohydrate-rich foods alongside whatever meat they could secure. The discovery matters because it suggests that carbohydrates, not meat alone, may have been the fuel that allowed our ancestors' brains to grow.
The study, published in the Proceedings of the National Academy of Sciences, analyzed genetic material from bacteria living in the mouths of 124 individuals—Neandertals, modern humans, pre-agricultural humans, chimpanzees, gorillas, and howler monkeys. By reconstructing bacterial DNA from up to one hundred thousand years ago, the researchers identified a pattern: both Neandertals and their Homo ancestors harbored bacteria from the genus Streptococcus, microbes specially adapted to bind with amilase, an enzyme in human saliva that breaks down starch into glucose. The presence of these bacteria suggested a diet rich in complex carbohydrates, likely consumed long before agriculture was invented. The brain, after all, is an energy-hungry organ. Between two million and seven hundred thousand years ago, our ancestors' brains roughly doubled in size. Meat certainly contributed to that expansion, but so did the steady supply of energy that starch provides.
It is easy to understand why meat has loomed so large in our understanding of prehistoric nutrition. Bones and teeth leave clear traces in the soil; plant consumption is harder to detect in the fossil record, visible mainly through the wear patterns on ancient teeth. Researchers had to adopt a novel approach—examining the microbial communities that lived in the mouths of our ancestors—to reveal what had been hidden. The Streptococcus bacteria found in Neandertal teeth had likely fed on sugars from starch-rich foods, their presence a kind of biological signature of dietary habit.
This finding challenges the logic behind modern paleo diets, which advocate high protein and fat consumption while sharply restricting carbohydrates, claiming to recreate the eating patterns of our cave-dwelling ancestors. But the evidence suggests otherwise. If you want to eat like a Neandertal, you cannot simply eliminate carbs. The carbohydrates were there. They mattered. They helped build the brains that made us human.
The contemporary food environment, of course, bears little resemblance to the scarcity our ancestors faced. We live surrounded by processed foods loaded with refined sugars, and overconsumption of these products contributes to diabetes, obesity, and other chronic diseases. The problem is not carbohydrates themselves but excess. Restrictive diets promise quick weight loss, but they often backfire over time, producing the yo-yo effect and causing stress to both body and mind. The scientific consensus is clear: the brain resists restriction. If you want to eat well, the path is not elimination but moderation, not deprivation but a peaceful relationship with food. Eat fresh, home-cooked meals built around whole carbohydrate sources. Trust that your ancestors knew something worth knowing: that the right fuel, consumed without fear or guilt, is what allows us to thrive.
Citas Notables
Your brain hates diets— Sophie Deram, nutritionist and author
Carbohydrates were important for human evolution and are a fundamental nutrient, not villains or addictive substances— Research findings discussed by Sophie Deram
La Conversación del Hearth Otra perspectiva de la historia
So researchers looked at bacteria in ancient teeth and concluded Neandertals ate carbs. How does that even work?
The bacteria in your mouth adapt to what you eat. If you're consuming a lot of starch, certain bacteria thrive because they can break down those sugars. The Streptococcus bacteria they found in Neandertal teeth had that specific adaptation. It's like reading a diary written in microbes.
And this matters because paleo diets claim to mimic ancestral eating. They're basically saying we should eat like our ancestors did.
Right, but they're selling a false version of that past. They say our ancestors were pure carnivores, that carbs are modern poisons. The evidence shows Neandertals were eating roots, grains, nuts—all carbohydrate sources. If you want to eat like them, you can't cut the carbs.
Why did people think prehistoric diets were all meat in the first place?
Bones and meat leave obvious traces in the ground. Plant foods don't. So for a long time, that's all we could see. It took a new method—looking at the bacteria itself—to reveal what was actually being eaten.
Does this mean carbs are suddenly healthy again?
They never stopped being healthy. The issue is that modern carbs often come loaded with added sugars and processing. Our ancestors ate whole foods. The carbohydrate itself isn't the villain. Excess is the problem, and restriction doesn't solve it—it usually makes things worse.
Worse how?
Restrictive diets stress the body and mind. They work short-term, then people regain the weight and more. But beyond weight, there's the psychological toll. Your brain actually resists restriction. The real answer is learning to eat well without fear.