By Paleo Life Coach Editorial Team · Last updated September 25, 2026 · Reviewed against Harvard T.H. Chan diet reviews, PubMed meta-analyses and USDA data
Paleo and keto get lumped together because both cut bread, pasta and sugar. Then you notice that a paleo breakfast can include a banana and sweet potato hash, while a keto breakfast includes cheese and cream, and it’s clear they aren’t the same diet. This paleo vs keto comparison lays out the rules side by side, does the carb math with USDA numbers, shows a full day on each, and summarizes what the research actually found.
The quick version: Paleo is about food quality: eat meat, fish, eggs, vegetables, fruit, nuts and seeds, and skip grains, legumes, dairy and processed food, with no set carb limit. Keto is about a metabolic state: keep carbohydrate under about 50 g a day, often 20 g, so your body makes ketones, and dairy is allowed. A meal can be paleo without being keto, and vice versa.
What is the difference between paleo and keto?
Paleo asks “is this a food a hunter-gatherer could have eaten?” Keto asks “will this keep my carbs low enough for ketosis?” That single difference drives every row of the table below.
| Paleo | Keto | |
|---|---|---|
| Core rule | Whole, unprocessed foods; no grains, legumes, dairy or refined sugar | Carbs low enough to produce ketones, typically under 50 g/day |
| Typical carbohydrate | Not limited; often 100–150+ g/day from fruit and starchy vegetables | 20–50 g/day, about 5–10% of calories |
| Typical fat | Moderate to high | 70–80% of calories |
| Protein | Often high | Moderate (too much can blunt ketosis) |
| Fruit | Yes | Small amounts of berries only |
| Sweet potato, winter squash | Yes | No (starchy vegetables excluded) |
| Dairy | No (ghee is a gray area) | Butter and hard cheeses allowed; cream and milk restricted by some plans for their lactose |
| Honey, maple syrup | Small amounts | No |
| Tracking | Not required | Carb counting is essentially required |
| Origin | Modern diet based on ancestral eating; Harvard notes its popularity peaked in 2014 | Introduced in 1920 as an epilepsy treatment, later popularized for weight loss |
Sources: Harvard T.H. Chan, Diet Review: Paleo Diet; Harvard T.H. Chan, Diet Review: Ketogenic Diet. Paleo carbohydrate range is from our USDA-computed 7-day paleo meal plan.
Harvard’s keto review puts numbers on it: keto “typically reduces total carbohydrate intake to less than 50 grams a day… and can be as low as 20 grams a day,” and on a 2,000-calorie diet the usual split works out to about 165 g fat, 40 g carbohydrate and 75 g protein.
How many carbs can you eat on paleo vs keto?
Paleo has no carb limit; keto has a tight one. The table shows why many foods that are paleo staples simply don’t fit a keto day.
| Paleo food (serving) | Carbs (g) | Share of a 20 g keto day | Share of a 50 g keto day |
|---|---|---|---|
| Sweet potato, baked, 1 medium (114 g) | 23.6 | 118% | 47% |
| Banana, 1 medium (118 g) | 27.0 | 135% | 54% |
| Apple, 1 medium (182 g) | 25.1 | 126% | 50% |
| Blueberries, 1 cup (148 g) | 21.4 | 107% | 43% |
| Honey, 1 tbsp (21 g) | 17.3 | 87% | 35% |
| Butternut squash, 1 cup (140 g) | 16.4 | 82% | 33% |
| Strawberries, 1 cup (152 g) | 11.7 | 59% | 23% |
| Broccoli, 1 cup (91 g) | 6.0 | 30% | 12% |
| Almonds, 1 oz (28 g) | 6.1 | 31% | 12% |
| Spinach, 1 cup raw (30 g) | 1.1 | 6% | 2% |
Calculation: total carbohydrate per serving from USDA FoodData Central (SR Legacy) divided by 20 g and 50 g. Keto limits per the Harvard keto review. Harvard notes that “net carbs” (total minus fiber) is an unregulated marketing term, so we show total carbohydrate.
One banana uses more than a full day’s carbohydrate on a strict 20 g keto plan. That’s the practical difference in one line. If you want the paleo-side detail, our paleo carbs per day guide breaks down typical ranges by activity level.
What does a day of paleo vs keto look like?
We built three sample days and totaled them with USDA FoodData Central values. All three are grain-free; they differ in fruit, starch and dairy.
| Standard paleo | Paleo-keto hybrid | Keto with dairy | |
|---|---|---|---|
| Breakfast | 3-egg omelet with spinach and pepper, strawberries, banana | 3 eggs with spinach cooked in olive oil, 1/2 avocado | 3 eggs with spinach, 1 oz cheddar, butter |
| Lunch | Chicken salad with avocado and olive oil | Salmon over romaine with olive oil and cucumber | Salmon over romaine with olive oil and 1/2 avocado |
| Dinner | Salmon, broccoli, sweet potato | 85% ground beef, broccoli, cauliflower, olive oil | 85% ground beef, broccoli, butter, 2 tbsp cream |
| Snack | Apple and almonds | 1 oz macadamia nuts | 1 oz macadamia nuts |
| Calories | 1,779 | 1,788 | 1,916 |
| Protein | 102 g | 98 g | 102 g |
| Carbohydrate | 141 g | 34 g | 26 g |
| Fat | 96 g | 144 g | 159 g |
| Fiber | 34 g | 18 g | 14 g |
| Protein / carbs / fat (% of calories) | 22 / 31 / 47 | 21 / 8 / 71 | 21 / 5 / 74 |
Calculation: raw-weight portions × per-100 g values from USDA FoodData Central. The standard paleo day is Monday of our 7-day plan.
Two things jump out. Removing fruit and starch drops fiber by roughly half, from 34 g to 14–18 g, below the 14 g per 1,000 calories adequate intake set by the Institute of Medicine (National Academies, DRI for macronutrients). And the paleo-keto hybrid reaches keto-like numbers without dairy, but only by leaning heavily on oil, avocado and nuts.
Which foods are keto but not paleo, and paleo but not keto?
| Paleo, not keto | Keto, not paleo | Both |
|---|---|---|
| Sweet potatoes, squash, plantains | Butter and hard cheeses | Meat, poultry, fish, eggs |
| Bananas, apples, most fruit | Sugar-free “keto” products with sweeteners like erythritol | Leafy greens, broccoli, cauliflower, zucchini |
| Honey and maple syrup (small amounts) | Heavy cream in coffee (some plans allow small amounts) | Avocado, olive oil, coconut oil |
| Carrots and beets in quantity | Soy products like tofu (listed by Harvard as keto-friendly) | Nuts and seeds in moderation |
Sources: allowed-food lists in the Harvard paleo review and Harvard keto review. Cheese details in our guide to whether cheese is paleo.
What does the research say about paleo and keto?
Neither diet has long-term, large-scale evidence behind it, and the two have mostly been tested against different comparison diets.
- Paleo: A 2015 meta-analysis of four randomized trials (159 participants) with people who had at least one component of metabolic syndrome found paleo produced greater short-term improvements than guideline-based diets in waist circumference (−2.38 cm), triglycerides and blood pressure. The authors rated the evidence moderate and noted the trials were short, up to six months (Manheimer et al., 2015, PubMed). Harvard adds that in a two-year trial of 70 postmenopausal women, the paleo group lost more fat at six months, but not at 24 months.
- Keto: A 2013 meta-analysis of 13 randomized trials with at least 12 months of follow-up found people assigned to a very-low-carbohydrate ketogenic diet (no more than 50 g/day) lost slightly more weight than those on low-fat diets, a mean difference of 0.91 kg, with lower triglycerides and diastolic blood pressure but higher LDL cholesterol (Bueno et al., 2013, PubMed).
- Safety notes: Harvard lists possible long-term keto risks including kidney stones, osteoporosis and higher uric acid, and possible deficiencies of fiber, B vitamins and minerals. For paleo, it flags calcium, vitamin D and B vitamins if dairy and grains aren’t replaced.
The honest summary: both can produce modest short-term improvements, the long-term difference between them is small or unknown, and the one you can sustain matters more than the one with the better headline.
Should you choose paleo or keto?
| Your situation | Better starting point | Why |
|---|---|---|
| You want a lasting everyday eating pattern | Paleo | No counting; fruit and starch allowed |
| You like cheese, cream and butter | Keto | Dairy is a keto staple, excluded on paleo |
| You exercise hard or play sports | Paleo | Room for carbohydrate from fruit and starchy vegetables |
| You specifically want ketosis, under medical supervision (for example, epilepsy) | Keto | Ketosis is the point, and it needs precise carb limits |
| You have diabetes or take glucose-lowering medication | Either, only with your clinician | Rapid carb cuts can change medication needs; see paleo and type 2 diabetes |
| You dislike tracking food | Paleo | Keto essentially requires carb counting |
If you have kidney disease, a history of disordered eating, are pregnant or take medication, talk to your doctor or a registered dietitian before starting either diet.
Can you combine paleo and keto?
Yes. A paleo-keto diet uses only paleo foods (no dairy, grains, legumes or sweeteners) while keeping carbs under about 50 g. The sample hybrid day above shows what that takes: eggs, fish, meat, low-starch vegetables, and a lot of added fat from olive oil, avocado and nuts. It’s stricter than either diet alone, lower in fiber than standard paleo, and harder to sustain socially. Most people who try it do better cycling: keto-style weekdays with paleo starches around training, or strict paleo with a lower-carb emphasis.
Common mistakes on paleo and keto
- Keto without enough vegetables. Low-starch vegetables are how keto eaters get fiber, potassium and magnesium.
- Keto built on processed “keto” snacks. Bars and sweets can meet the carb limit while offering little nutrition.
- Paleo as a license for paleo baking. Almond-flour muffins and honey-sweetened treats are compliant, not necessarily good for daily eating.
- Cutting carbs without adjusting medication. People on insulin or sulfonylureas need medical guidance before any low-carb diet.
- Ignoring calcium on paleo. Without dairy, plan sardines, salmon with bones, greens and almonds.
Frequently asked questions about paleo vs keto
Is paleo or keto better for weight loss?
Both can support weight loss when they reduce total calories. In long-term trials, ketogenic diets produced slightly more weight loss than low-fat diets, a difference of under 1 kg on average, while paleo trials show short-term benefits but little long-term data. The better choice is the one you can maintain; neither guarantees results.
Can you do paleo and keto together?
Yes. “Paleo-keto” means eating only paleo foods while keeping carbohydrates low enough for ketosis, usually under 50 g a day. It’s stricter than either diet alone, relies heavily on added fats, and tends to be lower in fiber, so plan plenty of low-starch vegetables.
What’s the biggest difference between paleo and keto?
Paleo is defined by which foods you eat and allows carbohydrate from fruit and starchy vegetables. Keto is defined by how much carbohydrate you eat, usually 20–50 g a day, and allows dairy. One is a food-quality rule; the other is a macronutrient rule.
Is paleo or keto easier to follow long-term?
Paleo is usually easier because it allows fruit and starchy vegetables and doesn’t require tracking. Keto requires counting carbs, and Harvard notes early symptoms such as hunger, fatigue, headaches and “brain fog” that may last days to weeks. Some people find keto’s strict structure easier than paleo’s judgment calls, so personality matters too.
Is paleo a low-carb diet?
Not necessarily. Paleo removes grains and sugar, which lowers carbs for many people, but fruit, sweet potatoes, squash and plantains are all allowed. Our USDA-computed 7-day paleo plan averages about 141 g of carbohydrate a day, roughly three to seven times a typical keto limit.
Can you eat fruit on keto?
Only small amounts, mostly berries. A cup of strawberries has about 12 g of carbohydrate, more than half of a strict 20 g keto day, and a single banana has about 27 g. On paleo, whole fruit is a normal part of the diet.
Your next step: pick by the foods you’d miss most
If you’d miss fruit and sweet potatoes, start with paleo. If you’d miss cheese and cream and don’t mind counting, keto may suit you better. Either way, check your calorie needs with the TDEE and macro calculator, and compare other options in the paleo diet comparisons hub or the four-way paleo vs keto vs Whole30 vs Mediterranean guide.
Consider this general nutrition reading, not a replacement for advice from your doctor or a registered dietitian, especially if you have a medical condition or take medication.
Research cited in this guide
- Diet Review: Paleo Diet – Harvard T.H. Chan School of Public Health
- Diet Review: Ketogenic Diet – Harvard T.H. Chan School of Public Health
- Paleolithic nutrition for metabolic syndrome: systematic review and meta-analysis (Manheimer et al., 2015) – PubMed
- Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis (Bueno et al., 2013) – PubMed
- FoodData Central (SR Legacy) – U.S. Department of Agriculture
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids – National Academies Press