What is the carnivore diet?
The carnivore diet is the elimination of all plant foods and the exclusive consumption of animal products - primarily meat, fish, and animal fats. Unlike standard ketogenic diets that allow 20-50g of net carbohydrates from low-carb vegetables, nuts, and berries, the carnivore diet keeps carbohydrate close to 0g, so ketosis is easy to reach and maintain.
Advocates often point to traditional diets, such as those of Arctic peoples, that were built mostly on animal foods. The modern carnivore movement has grown through personal reports of improvements in autoimmune conditions, food sensitivities, weight, and mental clarity, which advocates attribute to removing compounds found in plant foods. Those reports have not yet been tested in controlled trials; our guide to low-carb and carnivore diets for chronic disease covers what the research does and does not show.
Carnivore diet approaches
Beef & Butter (Lion Diet)
The most restrictive approach: ruminant meat (beef, lamb, bison), butter, water, and salt. Mikhaila Peterson popularized the "Lion Diet" name, describing it as an elimination diet for her own autoimmune symptoms; Dr. Shawn Baker has promoted carnivore eating more broadly. The logic advocates give is that beef rarely triggers food sensitivities, which makes it a simple baseline for an elimination diet. Most practitioners start here and slowly reintroduce foods.
Nose-to-Tail Carnivore
Includes all cuts including organ meats - liver, heart, kidney, bone marrow, and tongue. The most nutritionally complete approach because organ meats contain B vitamins, vitamin A, folate, iron, zinc, copper, and CoQ10 at concentrations far exceeding muscle meat. A serving of liver once or twice a week supplies large amounts of vitamin A, B12, folate, and copper.
All Animal Products
Expands to include all meats, fish, shellfish, poultry, and animal fats. Fatty fish adds omega-3 EPA and DHA. This is the most common long-term carnivore approach - more varied than beef-only, more restrictive than animal + dairy.
Animal Products + Eggs & Dairy
The most flexible carnivore variant, including eggs, butter, cheese, heavy cream, and other full-fat dairy. This version allows the widest range of carnivore-compatible cooking and the most dietary variety. Note: some people find dairy (particularly casein protein or lactose) interferes with weight loss or triggers inflammation - monitor your response.
How the carnivore calculator sets your macros
Carbohydrate is set at 0 g. Protein is set at 2.2 g per kg of lean body mass (about 1.0 g per pound of lean mass), the top of the range this site uses, because almost every carnivore food is a protein source and a lower intake is hard to eat in practice. Protein is also filling and helps preserve lean mass during weight loss. Fat fills the remaining calories, so the fat and protein percentages are a result of the grams rather than a fixed ratio.
Many carnivore advocates suggest eating to fullness without tracking. A calculator gives you a baseline to compare against, which helps if you have a specific goal such as weight loss or muscle gain. Treat the numbers as a starting point: fattier cuts make the fat target easy to reach, leaner cuts make it easier to stay under it.
Electrolytes and the carnivore transition
The carnivore transition is similar to keto flu and can feel more abrupt for people coming straight from a typical Western diet. Sodium is the main lever: a total of about 3,000 to 5,000 mg a day, from salting food generously and drinking broth, eases headaches, cramps, and fatigue for many people. If you have high blood pressure, heart or kidney disease, or take blood pressure medication, set this with your clinician.
Meat and fish supply a fair amount of potassium, and organ meats add more: cooked beef liver has roughly 300 mg per 3 oz serving. Magnesium is harder to get from animal foods alone, so some people on carnivore use a supplement, keeping supplemental magnesium at or below 350 mg a day. Do not add potassium supplements without medical advice if you have kidney disease or take ACE inhibitors, ARBs, or potassium-sparing diuretics.
Who should consider carnivore keto?
Carnivore is most commonly adopted by people who have not achieved their desired results on standard keto, who suspect food sensitivities or autoimmune triggers from plant foods, or who hope that removing plant foods will ease symptoms of conditions like psoriasis, IBS, rheumatoid arthritis, or Crohn's disease. Some people report striking improvements; the evidence so far is case reports and surveys rather than trials. It is also used as an elimination protocol - the strictest possible dietary reset - before systematically reintroducing foods.
Carnivore is not recommended as a first-line dietary approach without medical supervision for people with kidney disease, gout, elevated uric acid, or familial hypercholesterolemia. The high saturated fat content may be a concern for certain cholesterol phenotypes - discuss with your doctor before starting.
Carnivore vs standard keto
The key differences: carnivore keeps carbohydrate close to zero, so ketosis is steady without carb counting. Standard keto requires tracking net carbs; carnivore needs much less tracking, because most animal foods contain little or no carbohydrate (dairy, liver, and shellfish have a few grams). Standard keto allows more dietary variety; carnivore is simpler (no label-reading required) but more restrictive socially. Because it removes plant foods entirely, carnivore draws many people with autoimmune conditions who are looking for food triggers.