Will the Paleo Diet Put You Into Ketosis?
Summary
The paleo diet and ketogenic diet differ significantly in their carbohydrate and protein ratios, making ketosis unlikely for most people following paleo. Whether paleo can induce ketosis depends on individual factors like age, metabolism, and insulin resistance. For most average people, paleo’s higher carb and protein content will prevent meaningful ketosis.
Key Takeaways
- Paleo is not the same as keto — paleo allows approximately 30% of calories from carbs, compared to only 5% on a ketogenic diet
- Paleo-allowed foods like fruit, sweet potato, yam, and honey raise carbohydrate intake significantly above ketogenic thresholds
- Protein is higher on paleo (30–38% of calories) versus keto (20% of calories), which matters because excess protein can raise insulin levels
- High protein requires lower carbs — if protein intake is elevated, carbohydrates must be reduced to compensate and maintain ketosis
- Most average people will not reach ketosis on paleo, particularly those with insulin resistance or a slow metabolism
- Heavy exercise may change the equation — those doing significant training may burn off enough carbs to push ketone levels higher on a paleo-style diet
- To achieve ketosis, both protein and carbohydrates must be deliberately reduced below paleo’s typical ranges
Details
Macronutrient Comparison: Paleo vs. Keto
| Macronutrient | Paleo Diet | Ketogenic Diet |
|---|---|---|
| Carbohydrates | ~30% of calories | ~5% of calories |
| Protein | 30–38% of calories | ~20% of calories |
The gap between these two dietary approaches is substantial. Paleo permits a range of carbohydrate-containing whole foods — including fruit, sweet potatoes, yams, and honey — that are typically excluded or severely restricted on a ketogenic diet.
The Protein-Insulin Connection
A less commonly understood factor is the role of dietary protein in insulin production. Consuming too much protein can stimulate insulin secretion, which in turn suppresses ketone production. This means that paleo’s higher protein range (up to 38% of calories) can work against ketosis even if carbohydrate intake is moderate.
To optimize for ketosis, both variables need to be managed simultaneously:
- Lower carbohydrates below the paleo threshold
- Moderate protein closer to the ketogenic recommendation of ~20% of calories
Who Is Unlikely to Reach Ketosis on Paleo
Dr. Berg specifically identifies the average person as unlikely to enter ketosis on a paleo diet, particularly those with:
- Insulin resistance — impairs the body’s ability to efficiently switch to fat and ketone metabolism
- Slow metabolism — reduces the rate at which carbohydrates are cleared and ketones are generated
- Older age — metabolic rate tends to decline with age, making carbohydrate tolerance lower
The Exercise Exception
One scenario where paleo might support ketosis is in individuals performing high volumes of training and exercise. If carbohydrates from paleo-approved foods are being burned off through intense physical activity, the metabolic conditions may shift enough to allow for some ketone production. However, this is considered an exception rather than the norm.
Practical Implication
If ketosis is the goal, paleo alone is generally insufficient. The overlap between paleo and keto exists — both eliminate processed foods and grains — but paleo’s inclusion of starchy vegetables, fruit, and higher protein makes it a fundamentally different metabolic approach.