An all-meat diet is called the **carnivore diet**. It’s also sometimes referred to as the “zero carb” diet because it eliminates virtually all carbohydrate-containing foods. The diet restricts eating to meat, poultry, fish, seafood, eggs, some dairy products, and water, cutting out every plant-based food group entirely.
What the Carnivore Diet Includes
The carnivore diet is simpler than most eating plans because the food list is short. You eat beef, chicken, pork, fish, and eggs. Cooking fats come from animal sources: butter, beef tallow, or ghee. Some followers include dairy like cheese or heavy cream, though others cut it out. Seasonings are generally considered acceptable, including salt, pepper, cumin, paprika, garlic, and chili paste.
Shopping looks different on this diet. You’re mostly in the meat, poultry, and seafood sections of the grocery store. Fruits, vegetables, grains, legumes, nuts, seeds, and sugar are all off the table. The macronutrient breakdown skews heavily toward fat and protein. In clinical observations, people eating this way typically get around 60% of their calories from fat, 37% from protein, and less than 3% from carbohydrates.
Variations of the All-Meat Diet
Not every version of the carnivore diet looks the same. The standard version allows any animal product, giving you a wide range of meats, fish, eggs, and dairy to work with. But stricter versions exist.
The **Lion Diet** is the most restrictive variation. It limits food to ruminant meat (beef, bison, lamb, goat, venison), salt, and water. That means no poultry, no pork, no fish, no eggs, and no dairy. Its proponents describe it as an elimination diet designed to identify food sensitivities, with the idea that you eat only ruminant meat for a period and then slowly reintroduce other foods.
A “nose-to-tail” approach is another common variation, where followers eat organ meats like liver, heart, and kidney alongside muscle meat. The logic is that organ meats provide a broader range of vitamins and minerals than steaks and ground beef alone.
How the Body Adapts
Without carbohydrates, your body shifts to burning fat as its primary fuel source, a metabolic state called ketosis. Your liver converts fat into molecules called ketones, which your brain and muscles use for energy instead of glucose. This transition typically takes a few days to a couple of weeks, and the adjustment period can be rough.
During those first weeks, many people experience fatigue, muscle cramps, headaches, and dizziness. This is partly an electrolyte issue. As your body adapts to burning fat, it flushes more sodium and water through the kidneys. Carnivore diet guidelines suggest higher electrolyte intake during this phase: roughly 3,000 to 5,000 mg of sodium per day (about 1.5 to 2 teaspoons of salt), 3,000 to 4,700 mg of potassium, and 300 to 400 mg of magnesium. Salting food generously and eating potassium-rich meats like beef can help, though some people supplement.
Nutritional Gaps and Risks
The most commonly cited concern with the carnivore diet is vitamin C. Fresh meat contains small amounts of it, but cooking destroys much of what’s there. Only about 10 mg of vitamin C per day is needed to prevent scurvy, and the daily recommended intake is 60 mg for nonsmoking adults. Case reports of scurvy have appeared in people eating exclusively cooked meat with no fresh produce. The risk is real, though followers who eat raw or rare organ meats (particularly liver) may get enough to avoid deficiency.
Fiber is completely absent from the diet. This raised early concerns about gut health, but a case study published in a peer-reviewed journal found something unexpected: a healthy long-term carnivore dieter’s gut microbiome was dominated by bacteria normally associated with fiber breakdown, including Faecalibacterium and Roseburia. Neither the diversity nor the functional capacity of the gut bacteria differed significantly from people eating a standard diet. This is a single case study, not a definitive answer, but it suggests the gut may adapt more than previously assumed.
Cholesterol and Heart Health Concerns
The effect on cholesterol is one of the most significant medical concerns. A case report published in the journal Atherosclerosis described two healthy young men, ages 28 and 33, who presented with extraordinarily high LDL cholesterol after one year on a carnivore diet. Their LDL levels reached 15 and 17 mmol/L, roughly six to seven times the normal upper limit. These numbers were so extreme that doctors initially suspected a rare genetic condition called familial hypercholesterolemia before identifying the diet as the cause.
Not everyone on the diet sees numbers this dramatic, and individual responses vary based on genetics. But with 60% of calories coming from fat, much of it saturated, significant LDL increases are a common finding. This is a point of genuine medical concern, particularly for people with existing cardiovascular risk factors.
What the Science Does and Doesn’t Show
Anecdotal reports from carnivore diet followers frequently describe improvements in autoimmune symptoms, joint pain, skin conditions, and digestive issues. These claims are widespread in online communities but haven’t been tested in controlled trials. A clinical study currently recruiting participants at the time of writing aims to evaluate the effects of carnivore and lion diets on inflammatory bowel disease and rheumatoid arthritis, measuring inflammation markers like C-reactive protein over 24 weeks. Until results from studies like this are available, the evidence base is limited to case reports and self-reported experiences.
The elimination aspect of the diet may explain some of the reported benefits. By removing all plant foods, processed ingredients, sugar, and common allergens like gluten and soy simultaneously, some people may inadvertently eliminate a specific food trigger that was causing their symptoms. The challenge is that without structured reintroduction, you never learn which food was actually the problem.