A raw diet centers on eating foods that have never been heated above roughly 104 to 118°F (40 to 48°C). The core idea is that cooking destroys nutrients and natural enzymes in food, so eating everything uncooked preserves more of what your body needs. In practice, this means meals built around fresh fruits, vegetables, nuts, seeds, and sometimes raw animal products, depending on the version you follow.
Types of Raw Diets
There are three main variations. A raw vegan diet is the most common and excludes all animal products, focusing entirely on plant-based foods. A raw vegetarian diet adds raw eggs and unprocessed dairy products like raw milk and certain cheeses. A raw omnivorous diet goes further, including raw or dried meat and fish alongside plant foods.
Most people who identify as “raw foodists” follow the vegan version. Some eat 100% raw, while others aim for 75% or more of their calories from uncooked sources. The degree matters: studies show that people eating over 90% raw experience more pronounced effects on weight and hormonal health than moderate raw eaters.
How Raw Food Is Prepared
Eating raw doesn’t mean eating everything straight from the ground. Raw food preparation relies on a few key techniques that transform ingredients without heat.
- Soaking: Nuts, seeds, and grains are submerged in warm salted water for up to 24 hours. The combination of water and minerals helps break down compounds that interfere with nutrient absorption.
- Sprouting: After soaking, foods are rinsed and left in shallow water with air exposure for two to five days until they germinate. This process unlocks stored nutrients and further reduces compounds that block mineral absorption.
- Dehydrating: A dehydrator set to around 110 to 115°F dries foods over 18 to 24 hours, giving them texture and crunch while staying under the raw temperature threshold.
- Blending and juicing: Smoothies, cold soups, nut milks, and fresh juices are staples. Blending breaks down cell walls mechanically rather than with heat.
- Fermenting: Sauerkraut, kimchi, and kombucha are considered raw because fermentation relies on bacteria, not cooking.
The Enzyme Theory Behind Raw Diets
The central claim of raw diet advocates is that raw foods contain natural enzymes essential for digestion, and that cooking destroys them. There’s a kernel of truth here: heat does break down enzymes in food. But the human body produces its own abundant supply of digestive enzymes to handle carbohydrates, protein, and fat. Plant-sourced enzymes are not needed for human digestion and health, according to nutrition researchers at the University of Florida. Your stomach acid alone is strong enough to denature most food enzymes before they could do any work in your gut.
This doesn’t mean raw foods lack benefits. It just means the enzyme argument isn’t the reason.
What Cooking Actually Does to Nutrients
The relationship between heat and nutrition is more complicated than “raw is better.” Cooking destroys some nutrients and dramatically increases others.
Heat breaks down the thick cell walls of plants, which helps your body absorb nutrients that are otherwise locked inside. Cooked tomatoes contain about 35% more of one form of lycopene (a powerful antioxidant) than raw tomatoes. Cooked carrots deliver more beta-carotene. Cooked spinach, mushrooms, asparagus, cabbage, and peppers all supply more antioxidants than their raw counterparts. Boiling and steaming tend to preserve these compounds better than frying.
Cooking also creates beneficial compounds that don’t exist in raw food. When cruciferous vegetables like broccoli, cauliflower, and cabbage are heated, they produce indole, an organic compound linked to protective health effects.
On the flip side, water-soluble vitamins like vitamin C and some B vitamins do decline with cooking. So the honest picture is that some foods are more nutritious raw and others are more nutritious cooked. A diet that includes both gets the widest range of available nutrients.
Antinutrients in Raw Plant Foods
Plants produce natural defense compounds that can interfere with how your body absorbs minerals. These are only a real concern when your diet consists exclusively of uncooked plant foods, which is exactly the situation a raw vegan diet creates.
Oxalates, found in raw spinach, kale, broccoli, and soybeans, bind to calcium and prevent your body from absorbing it. Phytates, concentrated in grains, nuts, and seeds, reduce absorption of iron, zinc, and other minerals. Lectins, present in wheat, beans, quinoa, peas, peppers, eggplants, and tomatoes, can trigger inflammatory responses. In some people, lectins contribute to joint pain, skin issues, and digestive discomfort.
Soaking and sprouting reduce these compounds, which is why those techniques are so central to raw food preparation. Cooking, however, is far more effective at neutralizing them. This is one of the practical trade-offs of eating exclusively raw.
Nutritional Risks of Long-Term Raw Diets
The most well-documented deficiency among raw vegans is vitamin B12, which is found almost exclusively in animal products. One study of raw vegan participants found that 92% had B12 levels below the normal threshold, and 53% had levels low enough to risk neurological damage. Even among raw vegans eating nori seaweed and other plant foods sometimes claimed to contain B12, deficiency rates remained high.
Weight loss is common and sometimes extreme. While some people seek this out, a long-term study on raw food dieters found that roughly 30% of women under 45 experienced partial to complete loss of their menstrual period. Women eating over 90% raw were affected more frequently than those eating a more moderate proportion. Loss of menstruation signals that the body isn’t getting enough energy and can have serious consequences for bone density and fertility.
Other nutrients that tend to run low on raw diets include iron, zinc, omega-3 fatty acids, vitamin D, and adequate calories overall. The more restrictive the version of the diet, the more supplements become necessary to avoid deficiency.
Food Safety Concerns
Cooking is one of the most reliable ways to kill harmful bacteria. Thorough heating destroys Salmonella, Listeria, and toxic strains of E. coli. When you skip that step, especially with animal products, the risk of foodborne illness rises.
Raw eggs, unpasteurized dairy, and raw meat or fish all carry bacterial risks that cooking eliminates. Even raw plant foods can harbor pathogens from soil or contaminated water, which is why thorough washing matters more on a raw diet than on a cooked one. Sprouts are a particular concern because the warm, moist conditions that encourage germination are also ideal for bacterial growth.
Potential Benefits
People who follow raw diets tend to eat large volumes of fruits and vegetables, which means high intake of fiber, vitamin C, potassium, and various plant compounds. Most raw dieters report improvements in energy and digestion, at least initially. The diet naturally eliminates processed foods, added sugars, and refined oils, which accounts for many of the health improvements people experience.
Raw diets are also very low in sodium and saturated fat. For people coming from a typical processed-food-heavy diet, the shift can lower blood pressure and improve cholesterol markers. Whether those changes come from eating raw specifically, or simply from eating more whole plants and fewer processed foods, is harder to untangle.
Who Should Be Cautious
Children, pregnant women, older adults, and anyone with a compromised immune system faces higher risk from both the foodborne pathogens and the nutritional gaps associated with raw diets. People with a history of disordered eating should also approach raw diets carefully, as the rigid rules and frequent weight loss can reinforce restrictive patterns. If you’re drawn to eating more raw foods, adding raw meals alongside cooked ones captures many of the benefits while avoiding the most serious nutritional pitfalls.