What evolution can teach us about the way we eat today
“Humans weren’t meant to drink cow’s milk.”
“Wheat is unnatural to humans.”
“We should eat exactly like our ancestors.”
“Broccoli didn’t exist back then.”
Spend enough time in the health and wellness world and you’ll hear these ideas repeated again and again. Whether it’s Paleo, keto, carnivore, vegan, raw diet, plant based, gluten-free or dairy-free, many modern diets are built around the same underlying question:
What were humans originally meant to eat?
It’s a fascinating question, and one I’ve found myself thinking about often.
As someone who loves cooking from scratch, making yoghurt, baking sourdough, growing herbs and veggies and learning where food comes from, I’ve always been curious about the relationship between nature, food and our health.
But the more I learned about evolution, the more I started wondering if we were asking the wrong question. Because what if there was never one perfect human diet? What if the thing that helped us survive wasn’t eating the same foods forever…
…but our incredible ability to adapt?
When you step back and look at the bigger picture, something remarkable begins to appear.
Humans changed.
Plants changed.
Animals changed.
Our gut microbes changed.
The foods we eat changed.
Even today, evolution hasn’t stopped. Around us, plants, animals, fungi and bacteria continue adapting to the world they live in, just as they always have.
Maybe the greatest lesson evolution teaches us isn’t that we should try to return our diets to one specific moment in history but that life and our diets never stops changing.
“Evolution doesn’t ask what’s ideal. It asks what survives.”
Could There Ever Have Been a “Perfect Human Food”?
Sometimes we talk as though there was a single moment in history when the perfect human diet existed. But evolution doesn’t really work like that. After all, how could there have been a perfect food for humans before humans even existed?
Long before Homo sapiens appeared, the plants, animals and ecosystems around them were evolving to suit completely different worlds.
Then humans arrived and the story continued. As we changed and so did the foods around us. Some plants became easier to harvest, some fruits became sweeter, some grains became larger and some people evolved to digest milk into adulthood. Our food wasn’t waiting for us before we arrived, it evolved alongside us. Perhaps that’s exactly what we should expect from a living world that never stands still.
Our Ancestors Didn’t Follow Diets
It’s easy to imagine our ancestors following one simple “natural” diet but reality was far more interesting.
For millions of years, different human species lived in completely different environments. Some walked across African grasslands. Others survived freezing Ice Age Europe. Some lived near coastlines rich in shellfish, while others relied on forests, rivers or open plains. Naturally, their diets reflected those environments.
One of our earliest human relatives, Homo habilis, likely ate whatever they could find: wild berries, fruit, roots, tubers, nuts, seeds, insects, eggs and the occasional meat scavenged from animal carcasses. Food wasn’t about following rules, it was about taking opportunities.
Later came Homo erectus, a species that spread across much of Africa and Asia. Evidence suggests they hunted more regularly than earlier humans and, perhaps most importantly, learned to control fire. We’ll come back to why that matters shortly.
By the time Homo heidelbergensis appeared around 700,000 years ago, hunting had become even more sophisticated. Archaeologists have discovered beautifully crafted wooden spears, suggesting these humans worked together to hunt large animals while still gathering seasonal plants, berries, nuts and roots whenever they were available.
Then came one of our closest relatives. The Neanderthals. We’re a lot closer to them than most people realise but more about that soon. For years they were portrayed as almost exclusively meat eaters, and in many icy regions they certainly relied heavily on animals like bison, reindeer and mammoths simply because plant foods were scarce.
But newer discoveries tell a richer story. Researchers have found evidence that Neanderthals also ate mushrooms, pine nuts, legumes, roots and even wild grains in some regions. Tiny starch granules preserved in dental plaque suggest they cooked and ate starchy plants long before farming existed. In other words, even Neanderthals adapted their diets depending on where they lived.
The same was true for Homo sapiens. As our own species spread across Africa, the Middle East, Europe, Asia and eventually Australia and the Americas, there wasn’t one “human diet.”
There were hundreds. People living beside rivers caught fish. Those near coastlines gathered shellfish. Forest communities ate different plants from people living on open plains and some groups relied more heavily on meat, while others gathered far more plant foods.
Our ancestors weren’t following a nutritional philosophy. They were responding to the seasons, the climate and the landscapes around them and perhaps that’s the real lesson. Not that humans evolved eating one perfect menu but that we’ve always been remarkably adaptable.
We Even Shared More Than Food
One of the most fascinating discoveries in human evolution came from ancient DNA. When modern humans left Africa around 60,000–70,000 years ago, they didn’t simply replace the Neanderthals living across Europe and western Asia. They met them, they lived alongside them, they had children together and those children were fertile.
Today, most people with European and Asian ancestry carry around 1–2% Neanderthal DNA, passed down through thousands of generations. Those tiny pieces of DNA still influence us today, affecting everything from aspects of our immune systems to skin and hair biology.
The Discovery That Changed Everything
If I had to choose one moment that transformed the human diet forever, it wouldn’t be farming. It would be fire. Learning to control fire didn’t simply make food taste better. It changed what food could become. Raw meat became softer, tough roots became sweet and digestible and hard grains became edible.
Many harmful bacteria and parasites that once travelled through food could be destroyed with heat, making meals safer and reducing the risk of serious illness.
Cooking also unlocked more calories from many foods. Imagine trying to eat a raw potato. Now imagine it roasted until it’s fluffy and sweet. It’s the same food, yet your body can access far more of its energy once it’s cooked.
Some scientists, including evolutionary biologist Richard Wrangham, have even proposed that cooking played a major role in the evolution of our large human brains. Because cooked food requires less energy to chew and digest, more energy may have been available to support one of the most demanding organs in the body, our brain.
Whether every part of that idea proves correct is still debated, but there’s little doubt that cooking changed the course of human history. It didn’t just nourish our bodies, it changed the way we gathered. Families sat around fires, knowledge was shared, food became safer and meals lasted longer and perhaps, without even realising it, our ancestors began transforming the relationship between humans and food forever.
As someone who genuinely enjoys spending an afternoon baking bread or making yoghurt from scratch, I love thinking about this. Every time we light an oven, stir a pot or gather around a dinner table, we’re continuing a tradition that stretches back hundreds of thousands of years. Cooking isn’t separate from nature, it became part of our evolution.
The First Seeds of Change
Long before neat rows of wheat covered fields or vegetable gardens filled backyards, our ancestors were already paying close attention to the plants growing around them.
Imagine noticing that one patch of wild grass produced larger seeds than another or that one fruit tasted sweeter. Or that a certain plant grew back each year where seeds had fallen. No one understood genetics and no one knew the word “evolution.” They simply noticed, experimented, and remembered what they preferred.
Over countless generations, those tiny observations would quietly change the world and they would eventually lead to one of humanity’s greatest turning points… Agriculture. We’ll come back to that in a moment, because the story of farming isn’t just about humans. It’s also the story of wheat, vegetables and countless other plants that began evolving alongside us.
The First Garden Wasn’t Planned
When we think about the beginning of farming, it’s easy to imagine someone waking up one morning and deciding to become a farmer. The reality was almost certainly much slower and, in my opinion, far more beautiful.
Around 12,000 years ago, as the last Ice Age came to an end, the climate began to warm. Glaciers retreated, forests spread, and many human groups no longer needed to move constantly in search of food. For the first time, some communities were able to stay in one place for longer periods and when you spend enough time in one place, you begin to notice things. Perhaps someone noticed that edible grasses grew where seeds had fallen the previous year or perhaps discarded fruit seeds sprouted near campsites.
Maybe a child scattered seeds without thinking, only to discover new plants growing months later. No one can know exactly how it happened but we do know that farming wasn’t invented overnight. It emerged from thousands of tiny observations made over countless generations. Curiosity became cultivation and observation became tradition and slowly, humans began shaping the landscapes around them, they didn’t fight nature, they worked with it.
The Story of Wheat
One of the biggest myths surrounding wheat is that our ancestors never ate it when in reality, wild relatives of modern wheat existed long before agriculture. Hunter-gatherers living in parts of the Middle East were collecting wild grains thousands of years before they ever planted fields. Archaeologists have even discovered ancient grinding stones dating back well before farming became common, suggesting these grains were crushed into coarse flour and cooked in simple flatbreads or porridges.
They weren’t eating towering slices of highly refined supermarket sandwich bread but they certainly weren’t strangers to grains either. The difference is that wild wheat looked very different from the varieties we know today. Its seed heads shattered easily, scattering their grains across the ground before they could all be collected. From the plant’s perspective, this was perfect since scattering seeds is how wild grasses reproduce but for people trying to harvest them, it was messy and inefficient.
So imagine you’re living 10,000 years ago. You notice that one patch of wheat holds onto its seeds just a little longer than the rest so it’s easier to collect. Without realising it, you gather more seeds from those particular plants. The following season, those are the seeds you plant near your camp year after year, generation after generation. No one understood DNA and no one was trying to redesign nature. They were simply choosing the plants that worked best for their lives.
Over thousands of years, those tiny decisions transformed wild grasses into the wheat that would eventually feed entire civilizations. Humans didn’t force nature to change, they became part of the evolution.
Today, one of my favourite ways to enjoy wheat is through naturally fermented sourdough.
“The story of wheat isn’t just the story of a plant. It’s the story of human curiosity.”
Broccoli Was Never “Invented”
One of the most common things I hear is,
“Broccoli isn’t natural, it’s man made.”
And in one sense, that’s true.
If you travelled back thousands of years, you wouldn’t find the familiar green heads of broccoli growing in neat rows but that doesn’t mean broccoli suddenly appeared out of nowhere or that someone invented it in a laboratory. The story is much more fascinating than that.
Broccoli belongs to a species called Brassica oleracea, a wild mustard plant that still grows along rocky coastlines in parts of Europe today. If you’ve ever seen it, you probably wouldn’t give it a second glance. It’s scraggly, leafy and nothing like the vegetables filling our supermarkets.
Yet hidden inside that humble wild plant was incredible genetic diversity. Some plants naturally produced larger leaves. Others had thicker stems. Some developed tighter flower buds.
Without understanding genetics, ancient farmers simply saved seeds from the plants they liked best. Perhaps one family preferred bigger leaves, another liked thicker stems and another noticed flower buds that tasted delicious before they opened. Over hundreds, then thousands of years, those small choices slowly shaped entirely new vegetables.
Not one but many…
From the very same wild ancestor came:
- Broccoli
- Cauliflower
- Kale
- Cabbage
- Brussels sprouts
- Kohlrabi
Six completely different vegetables, one original plant.
That’s one of my favourite examples of evolution because it reminds us that extraordinary change often happens through ordinary choices repeated over a very long time. No laboratories or genetic engineering. Simply generations of people saving seeds from the plants that served them best which we call selective breeding.
A Carrot Wasn’t Always a Carrot
If you’ve ever pulled a bright orange carrot from your fridge and thought, “Well, that’s just what carrots have always looked like,” you’re not alone but the carrot has quite the story to tell.
The earliest cultivated carrots were nothing like the sweet, crisp vegetables we know today. They were often thin, woody and forked, with colours ranging from purple to white and yellow. They weren’t particularly pleasant to eat, but they were useful enough that people continued growing them.
Just like wheat and broccoli, variation already existed within these plants. Some roots were a little thicker, some were a little sweeter, some grew straighter than others.
Generation after generation, people naturally saved seeds from the carrots they enjoyed growing and eating most. Over hundreds of years, those tiny choices gradually transformed the carrot into the familiar orange vegetable we know today. No one sat down with a blueprint and no one decided, “Let’s alter the generics of the carrot.” It was simply another conversation between people and nature, unfolding one harvest at a time.
Corn Might Be Nature’s Greatest Makeover
If broccoli surprises people, corn usually leaves them speechless. Modern sweetcorn began as a wild grass called teosinte. If you placed teosinte beside a cob of corn today, most people would never guess they were related.
Teosinte has only a handful of small, hard kernels, each enclosed in a tough casing. It doesn’t resemble the juicy cobs we butter at summer barbecues. Yet hidden inside that humble grass was the potential for something extraordinary.
As generations of farmers saved seeds from plants with slightly larger ears or softer kernels, corn slowly changed. Not in decades, not even in centuries, but over thousands of years. Today, corn feeds billions of people around the world and yet its story began with a grass that many of us would probably walk straight past.
“Evolution doesn’t usually happen with giant leaps. It happens through countless tiny steps.”
Bananas Once Had Seeds
Imagine biting into a banana filled with large, hard seeds. That’s exactly what wild bananas were like. The bananas we eat today came from naturally occurring hybrids between wild banana species. Some of those hybrids produced fruit with tiny, undeveloped seeds instead of large, rock-hard ones and people loved them so they kept growing them.
Unlike many other fruits, bananas are propagated by planting shoots from the parent plant rather than seeds. Every Cavendish banana you buy at the supermarket is essentially a clone of countless bananas that came before it.
Again, humans didn’t create bananas by tweaking genetics. We recognised something useful that nature had already produced and helped it spread.
Apples Never Grow True From Seed
Here’s a fact I absolutely love. If you planted the seeds from your favourite apple today, there is almost no chance the tree would produce the same apples. That’s because apple seeds contain a unique mix of genes, meaning every seed grows into a genetically different tree.
For thousands of years, people have preserved the apple varieties they loved by grafting branches from one tree onto the roots of another. It’s one more example of humans working with the biology of a plant rather than rewriting it. The apples in our fruit bowl today are the result of centuries of patience, observation and care.
Avocados Were Once Waiting for Giants
Perhaps the strangest story of all belongs to the avocado. Millions of years ago, avocados are thought to have evolved alongside enormous Ice Age mammals, including giant ground sloths. These giant animals could swallow the fruit whole before carrying the large seed far away, helping new avocado trees grow in different places.
Then those giants disappeared. Many scientists believe avocados lost their primary seed dispersers. For a time, their future was uncertain until another species stepped in. Us!
Humans recognised the value of the fruit and began cultivating avocado trees, spreading them far beyond their original home. In a way, we became the avocado’s newest evolutionary partner.
Nature Has Always Changed Nature
Here’s something I find fascinating. People often speak about humans changing plants as though it’s something completely unnatural.
They often say things like:
“Broccoli is man-made.”
“Modern fruit isn’t natural.”
“Humans interfered with evolution.”
But when you look across the natural world, almost every species influences the evolution of another.
Bees don’t decide to improve flowers. They simply visit the ones with the most nectar. Over countless generations, flowers that attracted more pollinators reproduced more successfully. At the same time, bees evolved specialised hairs, behaviours and even tongue lengths that made collecting nectar more efficient and in return some flowers developed long, narrow tubes to accommodate the insects that pollinated them with long tongues. Both species quietly shaped one another over millions of years.
Fruit didn’t become colourful and sweet just for us. Many fruits evolved bright colours, sweetness and enticing aromas because birds and mammals were more likely to eat them and carry their seeds somewhere new. The animals received energy-rich food, while the plants gained a free transport system for their offspring.
Long before humans planted crops, leafcutter ants had already become farmers. They collect leaves not to eat directly, but to grow a special fungus that serves as their food. Over millions of years, the ants and fungi evolved together until each depended on the other.
Some flowers even evolved pale petals, powerful fragrances and abundant nectar specifically to attract bats instead of bees. In return, bats became important pollinators, helping those plants reproduce as they travelled from flower to flower.
Every species changes the world around it simply by trying to survive and humans are part of that story too. When we planted seeds from the sweetest fruit, nature responded. When we preferred larger grains, nature responded. When we saved seeds from a cabbage with bigger leaves, nature responded again.
In evolutionary biology, this is known as artificial selection where humans influence which traits are passed on by choosing which plants or animals reproduce.
The word artificial can sound as though humans created something entirely new by manipulating genetics, but that’s not really what’s happening. The variation already existed within the plants. Humans simply influenced which variations continued. Thousands of years ago this happened more unintentionally since no one understood genetics or evolution.
Today, plant breeding is often far more intentional which is why the word “artificial is used”. Farmers and plant breeders deliberately select for traits like flavour, disease resistance, drought tolerance and yield. While the methods have become much more sophisticated, the underlying principle is still the same: working with the natural genetic variation already present within a species. That’s very different from creating an entirely new organism from scratch.
The difference isn’t that humans influence evolution. It’s that we noticed the patterns, remembered them and intentionally continued them across generations. Saving seeds from sweeter fruit wasn’t fundamentally different from birds repeatedly spreading the seeds of the fruit they preferred.
The scale became greater and the intention became clearer but the process itself, life shaping life, has been unfolding for hundreds of millions of years. Perhaps we give ourselves too much credit and sometimes too much blame. Life has always shaped life. Humans are one chapter in that much bigger story. We’re simply participating in the same evolutionary process that has always existed.
“Nature doesn’t preserve the past. It responds to the present.”
We Didn’t Just Change Our Food
As our food changed, something else was changing too. Us!
Evolution isn’t a one-way street where humans shape the natural world while remaining exactly the same themselves. We’re part of the story, just as we influenced the plants and animals around us, those plants and animals influenced us in return. Perhaps one of the clearest examples is something as ordinary as a glass of milk.
Were Humans Meant to Drink Milk?
You’ve probably heard the phrase:
“Humans weren’t designed to drink cow’s milk.”
In a way, that’s true. For most of human history, babies produced an enzyme called lactase, which helps digest the natural sugar in milk, lactose. As children grew older and stopped breastfeeding, most of them naturally stopped producing large amounts of lactase. There simply wasn’t much reason to keep making it. Then something remarkable happened.
As farming spread and people began keeping cattle, sheep and goats, milk became a valuable source of nutrition in some parts of the world. For a few people, random genetic mutations meant they continued producing lactase into adulthood. Those people could digest fresh milk more easily than others.
In places where dairy animals were common, that may have provided an advantage during times when food was scarce. Milk offered calories, protein, fat, minerals and hydration all in one package. Over thousands of years, those genes became more common in some populations. Today, many people of Northern European ancestry digest lactose easily throughout adulthood.
In other parts of the world, such as much of East Asia, lactose intolerance remains far more common. Neither is more “natural.” They’re simply different evolutionary stories shaped by different environments.
And even among those who don’t tolerate fresh milk well, many people can comfortably enjoy fermented dairy like yoghurt, kefir or cheese because bacteria break down much of the lactose during fermentation. I actually find that fascinating. Even the microbes helping us make yoghurt became part of the story.
Our Teeth Tell a Story Too
Take a look in the mirror and our mouths reveal something surprising. We have sharp incisors for biting, canines capable of tearing, and broad molars built for grinding. We’re not specialised carnivores like lions nor are we specialised herbivores like cows. We’re omnivores. Our teeth suggest a species capable of eating a wide variety of foods.
Over time, as cooking softened meals and diets changed, our jaws also appear to have become smaller than those of many of our ancient ancestors.
Some researchers think softer foods and cooking may have contributed to this gradual change, although several factors are likely involved. That might even help explain why wisdom teeth often become impacted today or why some of us are missing one or a few or all of them together. Our mouths no longer have quite the same amount of room. It’s another reminder that evolution never really stops.
Perhaps Cooking Changed Us More Than We Realise
Earlier, we talked about fire changing food but perhaps it changed us too. Cooking doesn’t just make meals taste better, it softens fibres in plants, it breaks down connective tissue in meat and it destroys many harmful bacteria and parasites.
It allows us to access more energy from many foods than we could by eating them raw. Some evolutionary scientists believe this extra energy may have helped support the growth of our unusually large brains over hundreds of thousands of years.
While researchers continue exploring exactly how much of a role cooking played, there is little doubt that it transformed human life. It also transformed something less obvious and that would be community.
A fire became a gathering place, meals became shared experiences and knowledge passed from one generation to the next. Recipes long before they were ever written down were taught through observation. Perhaps that’s one reason cooking from scratch still feels so deeply satisfying today. It’s not just about nourishment, it brings us closer together through connection.
“Cooking didn’t separate us from nature. It became one of the ways we learned to live within it.”
Our Invisible Evolutionary Partners
When we think about evolution, we often picture animals or plants but some of the most extraordinary changes are happening in organisms too small to see. Inside every one of us lives an enormous community of bacteria, fungi and other microbes known as the gut microbiome.
These tiny organisms help break down parts of our food, produce important compounds and interact with our immune system in ways scientists are still working to understand. What’s incredible is that this community isn’t fixed, it changes throughout our lives.
The foods we eat, where we live, medications we take and even spending time outdoors can influence which microbes thrive inside us. In a sense, every meal feeds not only us, but an entire ecosystem living within us.
Evolution Is Still Happening
Sometimes people talk about evolution as though it’s something that happened in the distant past but it’s still happening right now. Scientists have discovered bacteria and fungi capable of breaking down certain plastics. Some fungi have evolved enzymes that can digest materials once thought almost impossible to decompose.
Around the world, animals are adapting to city life. Plants are responding to changing climates. Microbes continue evolving every single day and nature hasn’t stopped experimenting, it never has.
And while these changes don’t necessarily mean every new adaptation is beneficial for humans or the animals, they remind us of something important. That life responds again and again generation after generation and that’s what evolution has always done.
So Where Does That Leave Processed Food?
This is where I think it’s important to draw a distinction. When I look at broccoli, wheat or yoghurt, I see whole foods that have changed gradually alongside us over thousands of years.
When I look at many ultra-processed foods, I see something different. Many of these products have been engineered for convenience, long shelf life and intense flavour using chemicals, artificial flavours, ultra processed grain, and highly refined fats our bodies don’t recognise and struggle to process. They’ve appeared in only the tiniest fraction of our evolutionary history. Could humans continue adapting over thousands of generations? Perhaps… because evolution rarely stands still.
But today, the strongest scientific evidence suggests that diets built around whole and minimally processed foods are consistently associated with better health than diets dominated by ultra-processed foods and that’s why cooking from scratch aligns so well for me.
So… Maybe Nature Never Meant Food to Stay the Same
By now, you might be wondering whether I’m saying every food humans have ever created is automatically good for us and that’s just not the case. I still believe there’s an important difference between whole foods that have evolved gradually alongside us and foods that have been rapidly engineered for convenience, shelf life or hyper-palatability.
Choosing whole foods, cooking from scratch, growing herbs and veggies in the garden or baking your own bread isn’t about trying to recreate ancient life, it’s about staying connected to food that still feels recognisable.
Food that reflects seasons, soil, animals, microbes and generations of human knowledge passed from one kitchen to the next. At the same time, I don’t think we need to fear every food that didn’t exist exactly as it does today.
The more I learn about evolution, the less I believe there was ever one perfect human diet. Instead, I see a world that has always been changing. Humans changed. Plants changed. Animals changed. Even the tiny microbes living inside us continue to evolve today.
So… maybe we’ve been asking the wrong question all along. Instead of asking what humans were meant to eat, perhaps we should simply appreciate the incredible story of how humans and nature have grown together and the beautiful variety of foods we have available to us today.
“Evolution doesn’t ask what’s ideal. It asks what survives.”
My Thoughts
I don’t claim to have all the answers, and I’m certainly not trying to tell anyone how they should eat. This blog post simply reflects something I’ve been thinking about for a long time.
The more I learn about evolution, the less I believe there was ever one perfect human diet waiting to be discovered. Instead, I find myself appreciating something much simpler… Nature has always provided everything we need because it never stopped adapting and perhaps neither should we.
FAQs
Did ancient humans really eat wheat?
Yes. Hunter-gatherers collected and ate wild grains thousands of years before agriculture, although they looked very different from modern wheat.
Is broccoli man-made?
Broccoli wasn’t invented in a laboratory. It evolved through thousands of years of selective breeding from a wild mustard plant, with people repeatedly saving seeds from plants with desirable traits like the delicious flower buds.
Why can some adults drink milk while others can’t?
Lactose tolerance evolved independently in several populations after dairy farming became common. Many adults still naturally lose the ability to digest lactose, and both patterns are normal.
Did cooking help humans evolve?
Many scientists believe cooking played an important role in human evolution by making food safer, easier to digest and more energy-rich, although researchers continue to study exactly how significant its role was.
What is the healthiest diet according to evolution?
Evolution doesn’t point to one perfect diet. Instead, it shows that humans have been remarkably adaptable, eating different foods depending on their environment while thriving on a wide variety of whole, minimally processed foods.
Are carrots genetically engineered?
No. Modern carrots are not genetically engineered. They were gradually selectively bred over thousands of years from wild carrots by saving seeds from plants that were naturally sweeter, larger or straighter. It’s a great example of humans working with the natural variation that already existed, rather than creating a new plant from scratch.
