The paleolithic diet: Why should we eat like cavemen?
The paleolithic diet, often called the paleo diet, mimics presumed eating habits of prehistoric humans. It draws from the Paleolithic era—about 2.5 million to 10,000 years ago. In 1985, Dr. S. Boyd Eaton published an article in the New England Journal of Medicine. This brought the approach to attention. Later, Dr. Seignalet suggested using this ancestral diet to ease autoimmune diseases and reduce inflammation.
Lots of Vegetables—and More Vegetables!
This diet focuses on lean meats, fish, fruits, vegetables, nuts, and seeds. It excludes several food groups: grains, legumes, dairy, added sugars, and refined vegetable oils. Supporters argue these foods were absent in prehistoric diets. They believe these contribute to inflammation, weight gain, and metabolic issues.
Grains (wheat, corn, rice) are avoided. Legumes (beans, lentils, peas) are excluded. Dairy is omitted due to lactose—a natural milk sugar. Supporters claim humans are not genetically adapted to dairy after early childhood.
Some studies suggest benefits. The diet may lower heart disease risk factors: LDL cholesterol, triglycerides, and blood pressure. It can improve insulin sensitivity and blood sugar control. This may help people with type 2 diabetes or prediabetes.
Contradictory Study Results
Not all research agrees on paleolithic diet benefits. Some studies show mixed outcomes for weight loss and metabolic health. Concerns exist about limited food variety and missing nutrients—like calcium and vitamin D—from excluding dairy.
One reason for conflicting results is individual variability—especially genetics. For decades, science shows some people thrive on more meat-based diets. Others do better with plant-heavy patterns. This is nutrigenomics. When future nutrition studies account for genetic profiles, clearer answers may emerge.
Some people feel great on paleo. Others do not. Eating according to your genes is possible. Tests like 23andMe and nutrigenomic panels are now accessible. Everyone can learn key traits of their genetic makeup. This helps personalize the path to health.
Eating Like a caveman?
The core paleo hypothesis claims our genes have not adapted to modern industrial diets. These diets changed greatly in the last 40,000 years. This may explain rising chronic diseases, per the theory. But prehistoric humans lived only about 30 years on average. They rarely developed chronic illnesses.
That was another era. In the 21st century, what should we think about this way of eating? Should we eat like Cro-Magnon?
Paleo means eating far more vegetables and fruits. This habit alone helps prevent many diseases. It also cuts processed foods. This improves nutrient density: less sodium, less refined fats and sugars. These are clear paleo advantages. But similar benefits come from Mediterranean, vegetarian, or DASH diets—without strict carb limits.
When cutting carbs brings big relief, ask first: Is it all carbs or one specific carb? Allergies and intolerances are common! Not everyone tolerates everything. You may not need to avoid all carbs for that new well-being.
Long-Term Health Effects
Extreme paleo can provide too few carbs for body fuel needs. Excluding grains makes it hard to sustain long-term. This can trigger new cravings. Most followers allow “cheat” periods—a socially accepted way to give in.
Effects on Muscle Mass
Popular paleo today often means 20–40% carbs. This pushes protein above 30% and fats around 50%. Even with good fat choices, this is too high long-term. It favors fat storage and slows metabolism. Excess protein forces the body to break down muscle reserves. Muscles are glucose-dependent. Without this fuel, they release structural elements to feed the brain via glycogen. This harms long-term muscle maintenance!
A Dehydrating Diet
Any very low-carb diet causes chronic dehydration—even with high water intake. Excess protein elimination burdens kidneys, which need water to work. Losing muscle also means losing water. Check dehydration: Pinch the back of your hand. If skin stays tented, you are likely dehydrated. On low carbs, weight loss often signals water and muscle loss—not fat. True fat loss happens slowly without dehydration.
Carbs: A caveman’s Fuel!
Plenty of healthy complex carbs exist. Strict portion diets teach nothing about listening to body signals—something our ancestors did. We do not know how much they avoided carbs. Berries, fruits, tubers, squash, and ancient grains were seasonal options.
Critique of Human Evolution
Agriculture brought more carbs. This helped humans develop larger brains—an evolutionary advantage. Seafood remained common then. Cereal farming stabilized carb intake.
For the first generation since agriculture began, human brain volume is shrinking. Less omega-3 from reduced fish intake plays a role. Restrictive low-carb diets have also surged, such as the keto diet. Everything on our screens pushes the idea that protein trumps everything else.
Eating more vegetables and fruits—without overdoing meat or fats, without carb restriction—offers better chances to avoid health issues. This approach is far more sustainable long-term. Create your own diet. The one that fits you!
Interested in knowing more on nutrigenomics and personalized nutrition? Click here
References
- The Paleolithic Diet: A Review of Its Evidence and Application (2023). Nutrients (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC10005603/).
- Paleolithic Diet—Effect on the Health Status and Performance of Athletes? (2021, foundational; still widely cited). Nutrients (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8004139/).
- Nutrigenomics and Personalized Nutrition: What Does the Future Hold? (2024). Frontiers in Nutrition. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2024.1342400/full.
