Paleo vs Keto: What's the Difference?

The Paleo diet and the Ketogenic (Keto) diet are two of the most popular dietary approaches in the world, and they are often confused with each other. Both eliminate grains and processed foods. Both emphasize whole, nutrient-dense eating. But they are built on fundamentally different principles, follow different rules, and produce different physiological outcomes.

This guide breaks down exactly how Paleo and Keto compare — what each diet includes and excludes, where they overlap, where they diverge, and how to decide which approach fits your goals.

What Is the Paleo Diet?

The Paleo diet is based on the principle of eating foods that were available to humans during the Paleolithic era — roughly 2.5 million to 10,000 years ago, before the advent of agriculture. The core idea is that the human body is better adapted to the foods our ancestors consumed as hunter-gatherers than to the grains, legumes, dairy, and processed products introduced by modern agriculture and food manufacturing.

A Paleo diet emphasizes meat, seafood, eggs, vegetables, fruits, nuts, seeds, roots, and tubers. It excludes grains (including wheat, corn, rice, and oats), legumes (including beans, lentils, peanuts, and soy), dairy products, refined sugars, artificial sweeteners, artificial preservatives, and heavily processed foods.

Paleo does not require tracking macronutrient ratios. There is no specific target for fat, protein, or carbohydrate intake. The focus is on food quality and ingredient sourcing — choosing grass-fed meats, wild-caught seafood, and organic produce when possible.

The Certified Paleo standards developed by the Paleo Foundation define specific criteria for what qualifies as Paleo-compliant in packaged food products, providing consumers with a reliable way to identify products that meet these dietary requirements.

What Is the Keto Diet?

The Ketogenic diet is a high-fat, very-low-carbohydrate eating plan designed to shift the body's primary fuel source from glucose (derived from carbohydrates) to ketone bodies (derived from fat). This metabolic state is called ketosis.

A standard Keto diet typically targets a macronutrient ratio of approximately 70–75% of daily calories from fat, 20–25% from protein, and 5–10% from carbohydrates. For most people, this means consuming fewer than 50 grams of net carbohydrates per day, and in many cases fewer than 20–30 grams.

Keto allows foods that are high in fat and low in carbohydrates, including meats, fatty fish, eggs, butter, full-fat cream, natural cheeses, nuts, seeds, healthy oils (olive oil, coconut oil, avocado oil), and low-carb vegetables such as leafy greens, broccoli, and cauliflower. It excludes grains, most fruits (except small portions of berries), starchy vegetables (potatoes, sweet potatoes, corn), legumes, sugar, honey, maple syrup, and most processed foods.

The Keto Certified program evaluates net carbohydrate content, ingredient quality, and overall formulation to verify that packaged food products support nutritional ketosis.

What Paleo and Keto Have in Common

Despite their different foundations, Paleo and Keto share several important similarities:

Both diets eliminate grains and grain-derived products, including wheat, corn, rice, oats, barley, and rye. Both diets exclude legumes, including beans, lentils, peanuts, and soy. Both diets strongly discourage or prohibit refined sugars and ultra-processed foods. Both emphasize whole, nutrient-dense food sources — fresh vegetables, quality meats, seafood, eggs, nuts, and seeds. Both tend to result in lower carbohydrate intake compared to the Standard American Diet, even though only Keto specifically requires carbohydrate restriction.

Key Differences Between Paleo and Keto

While the overlap is significant, the differences between these two diets are meaningful and affect both day-to-day food choices and long-term sustainability.

Dairy: Paleo excludes all dairy products, including milk, cheese, butter, and cream. Keto allows high-fat dairy such as butter, heavy cream, and full-fat natural cheeses, as long as the carbohydrate content remains within the daily limit.

Fruits: Paleo allows all fruits, including higher-sugar options like bananas, mangoes, and grapes. Keto restricts fruit intake significantly, generally permitting only small portions of low-sugar fruits such as berries, because most fruits contain too many carbohydrates to maintain ketosis.

Starchy vegetables: Paleo allows starchy vegetables and tubers, including sweet potatoes, yams, and root vegetables. Keto excludes these because of their high carbohydrate content.

Natural sweeteners: Paleo permits natural sweeteners such as raw honey, maple syrup, and coconut sugar in moderation. Keto does not allow these and instead may permit certain artificial or non-caloric sweeteners like stevia and erythritol.

Macronutrient tracking: Keto requires careful tracking of macronutrient ratios — specifically maintaining a very high fat intake and very low carbohydrate intake — to achieve and sustain ketosis. Paleo does not require any macronutrient counting or tracking.

Primary goal: The Paleo diet's primary goal is to improve overall health by aligning food choices with ancestral eating patterns and eliminating potentially inflammatory modern foods. The Keto diet's primary goal is to induce and maintain a specific metabolic state (ketosis) in which the body burns fat for fuel instead of glucose.

Food quality emphasis: Paleo places strong emphasis on the sourcing and quality of food — grass-fed, pasture-raised, wild-caught, and organic are core to the Paleo framework. Keto is primarily concerned with macronutrient composition and does not inherently require specific sourcing standards, though many Keto practitioners choose higher-quality foods.

Can You Do Both? The Paleo-Keto Overlap

Yes. It is possible to follow both a Paleo and a Keto diet simultaneously. A Paleo-Keto approach would involve eating only Paleo-compliant foods (no grains, legumes, dairy, or processed foods) while also restricting carbohydrates enough to achieve ketosis (typically under 50 grams of net carbs per day). This means excluding both dairy (per Paleo rules) and high-sugar fruits and starchy vegetables (per Keto rules).

This combined approach is more restrictive than either diet alone but can be effective for people who want the food-quality focus of Paleo with the metabolic benefits of ketosis.

Products that carry both Certified Paleo and Keto Certified marks from the Paleo Foundation meet the requirements of both dietary frameworks.

Which Diet Is Right for You?

The best choice depends on your goals, your health situation, and what you can sustain long-term.

Consider Paleo if you want a flexible, whole-foods-based approach that does not require counting macros or tracking ketone levels. Paleo is generally easier to maintain long-term and in social settings because it allows a wider range of foods, including fruits, starchy vegetables, and natural sweeteners. It is well-suited for people whose primary goals are reducing inflammation, improving digestion, eliminating processed foods, and eating in alignment with ancestral health principles.

Consider Keto if you have a specific metabolic goal such as weight loss through fat adaptation, blood sugar management, or a medically supervised protocol (the ketogenic diet was originally developed in the 1920s as a treatment for epilepsy). Keto requires more discipline in tracking macronutrient intake and may be more difficult to sustain in social or travel situations due to the strict carbohydrate limit.

Consider both if you want the strictest level of dietary quality — eliminating grains, legumes, dairy, and processed foods while also keeping carbohydrate intake low enough to maintain ketosis.

Regardless of which approach you choose, look for third-party certified products when shopping for packaged foods. Certification marks like Certified Paleo and Keto Certified verify that a product's ingredients and formulation actually comply with the diet's standards, rather than relying on unverified marketing claims.

Summary: Paleo vs Keto at a Glance

Paleo is an ancestral, whole-foods-based diet that excludes grains, legumes, dairy, and processed foods. It does not require macronutrient tracking. Keto is a high-fat, very-low-carbohydrate diet designed to induce ketosis. It requires careful macro tracking and restricts carbohydrates to under 50 grams per day. Both diets exclude grains, legumes, refined sugars, and processed foods. They differ on dairy (Keto allows it, Paleo does not), fruits and starchy vegetables (Paleo allows them, Keto restricts them), and the role of macronutrient ratios (essential for Keto, not required for Paleo). The two diets can be combined into a Paleo-Keto approach for people who want both food-quality standards and metabolic ketosis.