The paleo diet is both gluten-free and dairy-free by design. It excludes all grains (which eliminates gluten) and all dairy products, making it one of the more restrictive popular diets when it comes to these two food groups. But there are some important nuances, especially if you’re avoiding gluten or dairy for medical reasons rather than general wellness.
Why Paleo Eliminates Gluten
The paleo diet is built around foods that could theoretically be hunted or gathered: meat, fish, vegetables, fruits, nuts, and seeds. It excludes anything that arrived with agriculture, including all grains and legumes. Since gluten is a protein found in wheat, barley, and rye, and paleo removes all grains entirely, gluten is automatically off the table.
This makes paleo functionally gluten-free for most people. If you follow the diet strictly, you won’t encounter gluten in whole foods. The complication arises with packaged products marketed as “paleo,” which we’ll get to below.
Why Paleo Eliminates Dairy
Dairy is excluded because it’s a product of animal domestication, which came thousands of years after the Paleolithic era. But the rationale goes beyond historical reenactment. A significant portion of the global population can’t fully digest lactose, the main sugar in milk. In people who are lactose intolerant, lactose ferments in the gut, causing gas, bloating, and diarrhea.
Beyond lactose, some people react to dairy proteins like casein. This is a separate issue from lactose intolerance and involves the immune system rather than digestion. Roughly 50% of people with celiac disease who don’t fully improve on a gluten-free diet alone show a specific immune response to cow’s milk, with casein as the likely trigger. This overlap between gluten and dairy sensitivity is one reason paleo removes both at the same time. When your immune system produces antibodies against gluten proteins, those antibodies can also bind to casein and other dairy proteins because the molecular structures are similar enough to cause confusion.
Some versions of paleo, sometimes called “primal” or modified paleo, allow certain dairy products like ghee (clarified butter), which has most of the milk proteins and lactose removed. Full-fat, fermented dairy like yogurt or aged cheese occasionally appears in more relaxed interpretations. But strict paleo is entirely dairy-free.
Paleo Labels Are Not the Same as Gluten-Free Labels
This is the most important distinction if you have celiac disease or a serious gluten sensitivity. Foods labeled “gluten-free” in the U.S. must contain fewer than 20 parts per million of gluten, and certified gluten-free products often meet even stricter thresholds. Paleo-certified products follow different rules entirely.
Products certified as paleo by major U.S. certifiers cannot contain grains or grain-derived products, but the certifications do not include testing for gluten. That means a paleo product could be manufactured in a facility that also processes wheat, and there’s no guarantee it meets the 20 ppm threshold that protects people with celiac disease. One paleo certification even allows wheat or barley grass juice under certain conditions, as long as the plants haven’t gone to seed.
If you need verified gluten-free status for medical reasons, look for a gluten-free certification on the label in addition to any paleo claims. The Paleo Foundation does offer a separate “grain-free” certification that tests for gluten and enforces a stricter 10 ppm cutoff, but this is a different label from their standard paleo certification.
Getting Enough Calcium Without Dairy
The most practical nutritional concern on paleo is calcium. Dairy is the primary calcium source in most Western diets, and removing it requires intentional replacement. Several paleo-compliant foods provide meaningful amounts:
- Canned salmon with bones: 187 mg per 3 oz serving
- Cooked Chinese cabbage (bok choy): 158 mg per cup
- Cooked kale: 94 mg per cup
- Almonds: 75 mg per ounce (about 24 nuts)
- Cooked broccoli: 62 mg per cup
Most adults need around 1,000 mg of calcium daily. Hitting that number on paleo is doable but takes planning. You’d need to eat several servings of these foods each day. Sardines with bones, collard greens, and turnip greens are other good options. Without deliberate effort, calcium intake on paleo tends to fall short.
Who Benefits Most From This Combination
Removing both gluten and dairy simultaneously can be useful for people trying to identify food sensitivities, since the two are among the most common dietary triggers for digestive and inflammatory symptoms. Limited research suggests paleo-style diets may reduce markers of inflammation and oxidative stress in adults, though the evidence base is still small.
For people with celiac disease or confirmed gluten sensitivity, paleo’s grain-free framework provides a natural starting point, but the lack of gluten testing in paleo-certified products means you can’t rely on a “paleo” label alone. For people with dairy allergies or lactose intolerance, paleo removes the guesswork by cutting dairy entirely rather than asking you to navigate which products you can tolerate.
If you’re following paleo purely for general health rather than managing a diagnosed condition, the diet’s elimination of both gluten and dairy is built into its structure. You don’t need to do anything extra. Just be aware that “paleo” on a package and “safe for celiac disease” are two very different claims.