A gluten-free and dairy-free diet eliminates two categories of food: anything containing the protein gluten (found in wheat, barley, and rye) and anything derived from animal milk (cow, goat, sheep). It’s one of the more common combination diets, followed by people with celiac disease, milk allergies, multiple food sensitivities, or autoimmune conditions where both triggers seem to worsen symptoms.
The diet sounds straightforward, but the overlap of these two restrictions touches nearly every aisle in the grocery store. Bread, pasta, cereal, cheese, yogurt, cream sauces, baked goods, and most processed snacks all contain gluten, dairy, or both. Successfully following this diet means knowing exactly what to avoid, what to eat instead, and how to fill the nutritional gaps that open up when you cut out two major food groups.
What You’re Cutting Out
On the gluten side, you’re removing wheat in all its forms (including spelt, farro, kamut, durum, einkorn, emmer, couscous, and semolina), plus barley, rye, and triticale. Oats are naturally gluten-free but are frequently contaminated during processing, so only oats specifically labeled gluten-free are safe. Flours like self-rising, enriched, graham, and farina all contain gluten. So do less obvious staples like bulgur, matzo, croutons, seasoned rice mixes, and many cereals.
On the dairy side, you’re removing milk, cheese, butter, cream, yogurt, ice cream, sour cream, and whey protein. This includes products from all mammals, not just cows. Dairy hides in baked goods, chocolate, protein bars, salad dressings, and many processed foods.
Beer, ale, and other malted beverages made from barley contain gluten. Drinks labeled “gluten-free” are fine, but products labeled “gluten removed” or “processed to remove gluten” are not considered safe for people with celiac disease. Cream-based liqueurs contain dairy.
Why People Follow This Diet
Celiac disease is the most well-established medical reason for strict gluten elimination. It’s an autoimmune condition where gluten triggers the immune system to damage the lining of the small intestine. People with celiac disease need to follow a gluten-free diet for life to prevent symptoms and intestinal damage from returning. Some people with celiac disease also develop temporary lactose intolerance because the intestinal damage impairs their ability to produce lactase, the enzyme that digests milk sugar. As the gut heals on a gluten-free diet, dairy tolerance sometimes returns.
Non-celiac gluten sensitivity causes similar digestive symptoms without the intestinal damage. A cow’s milk allergy, which is different from lactose intolerance, involves the immune system overreacting to milk proteins. Lactose intolerance, by contrast, is not an immune reaction at all. It simply means your body doesn’t produce enough lactase to break down the sugar in milk. Someone who is lactose intolerant may tolerate small amounts of aged cheese or butter, while someone with a true milk allergy needs to avoid all dairy completely.
Some people combine both restrictions because they have overlapping conditions, because they’re on an elimination diet to identify food triggers, or because they find the combination reduces inflammation, digestive discomfort, or skin issues.
What You Can Eat
The foundation of this diet is naturally gluten-free, naturally dairy-free whole food. That includes all fruits and vegetables, plain meat, poultry, and fish, eggs, legumes (beans, lentils, chickpeas), nuts and seeds, and gluten-free whole grains like rice, quinoa, millet, buckwheat (despite the name, it’s not related to wheat), amaranth, sorghum, teff, and certified gluten-free oats.
For dairy replacements, plant-based milks made from soy, almond, oat, coconut, or peas are widely available. Fortified soy milk most closely matches the nutrient profile of cow’s milk. Plant-based milks are generally lower in protein than dairy, though about 70% of products on the market are fortified with both calcium and vitamin D. Check labels, because some oat-based products may not be certified gluten-free.
Healthy fats come from olive oil, avocado oil, coconut oil, and avocados. Butter substitutes made from plant oils work for cooking and baking. Nutritional yeast adds a cheese-like flavor to dishes without any dairy.
Hidden Ingredients to Watch For
Gluten hides under names that don’t always scream “wheat.” Malt, barley malt, malt extract, malt syrup, malt flavoring, malted milk, and malt vinegar all contain gluten. The word “seasoning” on a label is a red flag: it often uses a wheat-based carrier, so check the allergen statement. Modified food starch, dextrin, and maltodextrin are usually gluten-free, but in rare cases they’re made from wheat. If wheat isn’t listed in the allergen statement, those ingredients are safe.
Dairy hides behind terms like casein, caseinate, lactalbumin, lactoglobulin, and ghee. Whey is a milk-derived protein found in many protein powders and processed foods. “Natural flavors” occasionally contain dairy-derived ingredients, so look for a milk allergen declaration on the label. Some medications and supplements use lactose as a filler.
In the U.S., the FDA requires that products labeled “gluten-free” contain fewer than 20 parts per million of gluten, the lowest level that can be reliably detected with validated testing methods. For dairy, look for “milk” in the allergen statement, which U.S. law requires manufacturers to disclose.
Nutritional Gaps to Fill
Cutting out both gluten-containing grains and dairy removes significant sources of several nutrients. Research has identified persistent deficiencies in people following this type of diet, particularly in fiber, folate, vitamin B12, vitamin D, calcium, iron, zinc, and magnesium. Gluten-free products tend to be lower in fiber, magnesium, and folic acid than their wheat-based counterparts, and gluten-free cereals found in nature have less magnesium than gluten-containing grains.
Calcium and vitamin D are the biggest concerns when you drop dairy. Adults generally need around 1,000 mg of calcium daily. A cup of cow’s milk provides roughly 300 mg. You can close that gap with fortified plant milks, canned sardines or salmon with bones, leafy greens like kale and bok choy, almonds, and fortified orange juice. For vitamin D, fortified foods, fatty fish, egg yolks, and sun exposure all contribute, but a supplement is often the most reliable option.
Iron and B12 come primarily from meat, fish, and eggs on this diet, since fortified cereals and breads (common sources for the general population) may not be available in gluten-free versions or may contain less of these nutrients. Folate-rich foods like spinach, asparagus, Brussels sprouts, and black-eyed peas help fill the folate gap. A daily multivitamin designed for your age and sex can serve as a safety net, but whole foods should be your primary strategy.
Preventing Cross-Contamination at Home
If you share a kitchen with people who eat gluten and dairy, cross-contamination is a real risk, especially for anyone with celiac disease or a milk allergy. Small traces matter. A few crumbs in a shared toaster or a knife double-dipped into a butter dish can be enough to trigger a reaction.
Dedicate specific shelves or cupboards to your gluten-free and dairy-free foods, and store them above foods that contain those ingredients so nothing sifts or drips down. Use separate utensils and small appliances where practical: a dedicated toaster, cutting board, colander, and rolling pin. Squeeze bottles for condiments like jam or mustard eliminate the double-dipping problem entirely. If separate sets of everything aren’t realistic, prepare and cook your food first, before any gluten or dairy-containing ingredients come out. Clean all surfaces and equipment thoroughly between uses.
Label condiment jars clearly. A shared jar of peanut butter that someone else has touched with a bread knife now contains gluten. The simplest solution is to keep two jars, one clearly marked as safe.
Making It Sustainable
The biggest practical challenge with a combined gluten-free and dairy-free diet is that it eliminates the convenience foods most people rely on. Sandwiches, pizza, pasta with cheese, cereal with milk, and yogurt are all off the table in their standard forms. Gluten-free, dairy-free alternatives exist for all of these, but they vary widely in taste, texture, and nutritional value. Many gluten-free packaged products compensate for flavor and texture by adding extra sugar, fat, or sodium.
Building meals around naturally compliant foods rather than substitutes tends to work better long-term, both nutritionally and financially. A stir-fry over rice, grilled chicken with roasted vegetables and quinoa, lentil soup, or a salad with avocado and nuts are all naturally gluten-free and dairy-free without requiring specialty products. Save the substitutes for the moments you really want them, like a gluten-free pizza crust on Friday night or oat milk in your coffee.
Eating out requires more planning. Many restaurants now offer gluten-free menus, but cross-contamination in restaurant kitchens is common. Ask specifically about shared fryers, cooking surfaces, and whether sauces contain flour or butter. Asian cuisines built around rice and noodles made from rice or sweet potato can be good options, though soy sauce contains wheat (tamari is the gluten-free alternative). Mexican food centered on corn tortillas, beans, and grilled meats is another naturally friendly choice, as long as you skip the cheese and sour cream.