The carnivore diet is an extremely restrictive eating pattern that includes only animal-based foods — such as meat, poultry, eggs, fish, seafood, and in some cases limited dairy — while cutting out all plant-based foods, including fruits, vegetables, grains, legumes, seeds and nuts. Because it eliminates carbohydrates almost entirely, it’s often called a zero-carb or meat-only diet. In practice, it’s the most extreme version of a ketogenic-style diet, where fat and protein replace nearly all carbohydrate sources for energy.

Followers of the carnivore diet usually eat foods like steak, bacon, ground beef, salmon, eggs, butter and sometimes cheese. They avoid even small amounts of plant foods — no coffee, tea or herbs, and no spices or condiments containing plant ingredients. The idea is that animal foods provide everything the body needs, while plants are viewed as unnecessary or even harmful because of certain naturally occurring compounds such as lectins, oxalates or phytates. However, these compounds are generally not harmful for most healthy individuals and are found in many foods known to support long-term health.

Potential health benefits

Although the carnivore diet has gained popularity through social media and anecdotal testimonials, there is little scientific research examining its safety or effectiveness over time. To date, most of the evidence comes from self-reported surveys or short-term case studies rather than controlled clinical trials.

One survey of over 2,000 adults following a carnivore diet for an average of 14 months found that many participants reported improvements in weight, blood sugar control, and self-perceived well-being (Current Developments in Nutrition, 2021). Participants reported high satisfaction and low rates of adverse symptoms. Some noted decreases in body mass index (BMI), hemoglobin A1c (a marker of blood sugar control), and use of certain diabetes medications.

Supporters of the diet often claim benefits such as:

Research on related eating patterns, like ketogenic or very-low-carbohydrate diets, does show improvements in insulin resistance, triglyceride levels, and short-term weight management among people with metabolic syndrome or Type 2 diabetes. However, those particular diets still include some plant foods, fiber and a wider variety of nutrients than the carnivore diet, likely making them easier to sustain long term.

Potential health risks

While some individuals report positive experiences, many diet and nutrition experts and medical organizations caution that the carnivore diet can pose several potential risks:

Other considerations

Critics of the carnivore diet also raise environmental and ethical concerns. Heavy reliance on animal agriculture increases greenhouse-gas emissions, water use, and land demand. From a sustainability perspective, a diet composed entirely of animal foods is among the least environmentally friendly eating patterns.

There are also practical challenges. Completely avoiding plant foods may make dining out, social gatherings, and travel more difficult. The limited food variety can reduce enjoyment of eating and make it harder to meet micronutrient needs without supplementation.

The bottom line

If you’re considering the carnivore diet, proceed with caution. Always consult with a registered dietitian or healthcare provider before beginning such a restrictive plan. A professional can help monitor for nutrient deficiencies and discuss safer, evidence-based alternatives for achieving your health goals.

(Environmental Nutrition is the award-winning independent newsletter written by nutrition experts dedicated to providing readers up-to-date, accurate information about health and nutrition in clear, concise English. For more information, visit www.environmentalnutrition.com.)

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