What does the research show about carnivore diet?

Carnivore diet

No controlled trials of the carnivore diet were located. In a self-report survey of 2,029 followers, BMI fell and people with diabetes reported lower HbA1c and less medication, with few reported symptoms. LDL cholesterol was high in that survey and rose from 157 to 256 mg/dL in 24 followers with blood tests. No study measured nutrient levels.

Add to Bio HackChecked 2026-11-13

Status: A dietary pattern, not a regulated product.
Also called: carnivore, lion diet, ketovore, zero-carb diet, all-meat diet, meat-only diet, animal-only diet
Followed for: weight loss, blood sugar, type 2 diabetes, triglycerides, gut symptoms, inflammatory bowel disease, well-being

Strong several reviews agree · Moderate one review or consistent trials · Limited one or a few small studies · Untested no study in people, listed with what it rests on

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LimitedLimited evidence: in a self-report survey of 2,029 adults on the diet, median BMI fell from 27.2 to 24.3.
LimitedLimited evidence: survey respondents with diabetes reported a median HbA1c fall of 0.4 points and less diabetes medication use.
LimitedLimited evidence: triglycerides fell in all 6 followers who started above 130 mg/dL, in a study of 24 people sharing blood tests.
LimitedCase reports: 10 people with ulcerative colitis or Crohn's disease, selected because they responded, reported improvement on mostly carnivore ketogenic diets.
LimitedLimited evidence: in a self-report survey, 95% of followers said their overall health improved.

Reported risks3

LimitedLimited evidence: in a self-report survey, 3.1% to 5.5% reported digestive symptoms, and fewer reported muscle or skin symptoms.Common
LimitedLimited evidence: LDL cholesterol rose from a median of 157 to 256 mg/dL in 24 followers who shared before and after blood tests.How often is not known
LimitedCase reports: a 61-year-old man on a carnivore diet developed acute pancreatitis caused by severe hypertriglyceridemia.How often is not known

What people follow it for, and what was found

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Limited

Weight loss

Limited evidence: in a self-report survey of 2,029 adults on the diet, median BMI fell from 27.2 to 24.3.

Compared with before the diet, in the same people [1]

The numbers and sources

Effect: Respondents reported a median BMI of 27.2 (IQR 23.5 to 31.9) before the diet and 24.3 (IQR 22.1 to 27.0) on it [1].
Population: 2,029 adults recruited through social media, median age 44, 67% men, on the diet for a median of 14 months. Survey data, not a trial [1].
Sources: [1]
Caveats: Self-reported and self-selected, with no comparison group. The survey included only people on the diet for 6 months or more [1]. A scoping review of 9 human studies rated the overall evidence very limited, with small samples, short durations and no control groups [2].

Limited

Blood sugar in diabetes

Limited evidence: survey respondents with diabetes reported a median HbA1c fall of 0.4 points and less diabetes medication use.

Compared with before the diet, in the same people [1], [3]

The numbers and sources

Effect: Respondents with diabetes reported a median BMI fall of 4.3 (IQR 1.4 to 7.2), a median HbA1c fall of 0.4% (IQR 0% to 1.7%), and reductions in diabetes medication use given as 84% to 100% [1]. In a German study, both followers who started with prediabetic HbA1c values had lower values on the diet [3].
Population: Survey respondents with diabetes [1]; 24 German followers who shared blood tests from before and during the diet [3].
Sources: [1], [3]
Caveats: Self-reported survey data and a very small before-and-after study, with no control group [1][3].

Limited

Triglycerides

Limited evidence: triglycerides fell in all 6 followers who started above 130 mg/dL, in a study of 24 people sharing blood tests.

Compared with no comparison group [1]; before the diet, in the same people [3]

The numbers and sources

Effect: All 6 participants with triglycerides above 130 mg/dL before the diet had lower levels on it [3]. Survey respondents who reported current lipids had a triglyceride level of 68 mg/dL [1].
Population: 24 German followers, median age 46, on the diet at least 1 month [3]; a subset of survey respondents [1].
Sources: [1], [3]
Caveats: No control group. The survey reported current values, not change [1].

Limited

Inflammatory bowel disease

Case reports: 10 people with ulcerative colitis or Crohn's disease, selected because they responded, reported improvement on mostly carnivore ketogenic diets.

Compared with no comparison group [4]

The numbers and sources

Effect: Six people with ulcerative colitis and four with Crohn's disease reported improvement of 72 to 165 points on the Inflammatory Bowel Disease Questionnaire [4].
Population: 10 adults with confirmed inflammatory bowel disease, recruited through a social media survey [4].
Sources: [4]
Caveats: A case series that included only people whose disease responded to the diet, so it cannot show how often it helps. No comparison group [4].

Limited

Well-being

Limited evidence: in a self-report survey, 95% of followers said their overall health improved.

Compared with no comparison group [1], [3]

The numbers and sources

Effect: Respondents reported improved overall health (95%), well-being (66% to 91% across measures) and high satisfaction [1]. German followers commonly reported subjective health improvements [3].
Population: 2,029 survey respondents [1]; 24 German followers [3].
Sources: [1], [3]
Caveats: Self-reported by people who chose the diet and stayed on it [1].

How trials defined it

No trial has defined the diet, and a scoping review found no standardized definition [2]. In the largest survey, followers had eaten it for a median of 14 months. 85% ate red meat daily or more, under 10% ate vegetables, fruits or grains more often than monthly, and 37% took no vitamin supplements [1]. In the bowel disease case series, diets were mostly meat, eggs and animal fats [4]. The German study required at least 1 month on a self-designed carnivore diet [3].

Risks

Reported risks3

LimitedCommon

Self-reported symptoms and nutrient concerns

Limited evidence: in a self-report survey, 3.1% to 5.5% reported digestive symptoms, and fewer reported muscle or skin symptoms.

The numbers and sources

How common: Common: between 1 in 100 and 1 in 10 people.
Effect: Reported symptoms included gastrointestinal (3.1% to 5.5%), muscular (0.3% to 4.0%) and skin (0.1% to 1.9%) [1].
Population: 2,029 survey respondents [1].
Sources: [1], [2], [6]
Caveats: No study located measured vitamin or mineral levels in people on the diet. A scoping review flagged potential shortfalls in vitamins C and D, calcium, magnesium, iodine and fiber [2]. An analysis of four modeled meal plans, with no people studied, fell short of reference intakes for thiamine, magnesium, calcium and vitamin C, sometimes for iron, folate, iodine and potassium, and well short for fiber [6].

LimitedHow often is not known

LDL cholesterol rise

Limited evidence: LDL cholesterol rose from a median of 157 to 256 mg/dL in 24 followers who shared before and after blood tests.

The numbers and sources

How common: How often is not known: the sources give no rate.
Effect: Median total cholesterol rose from 224 to 305 mg/dL (p < 0.0001) and LDL from 157 to 256 mg/dL (p 0.00024). No other blood marker changed significantly [3]. Survey respondents who reported current lipids had LDL of 172 mg/dL and HDL of 68 mg/dL [1]. A scoping review identified elevated LDL and total cholesterol across the human studies [2].
Population: 24 German followers [3]; a subset of 2,029 survey respondents [1]; 9 human studies [2].
Sources: [1], [3], [2]
Caveats: Small, self-selected groups without controls. No study measured heart attacks or strokes.

LimitedHow often is not known

Pancreatitis from very high triglycerides

Case reports: a 61-year-old man on a carnivore diet developed acute pancreatitis caused by severe hypertriglyceridemia.

The numbers and sources

How common: How often is not known: the sources give no rate.
Effect: One man of 61 on a carnivore diet had acute pancreatitis caused by severe hypertriglyceridemia [5].
Population: One case report [5].
Sources: [5]
Caveats: A single case. The report has no abstract, so this entry rests on its title [5].

Sources

Lennerz BS, Mey JT, Henn OH, et al. Behavioral Characteristics and Self-Reported Health Status among 2029 Adults Consuming a "Carnivore Diet". Current Developments in Nutrition. 2021. https://doi.org/10.1093/cdn/nzab133
Lietz A, Dapprich J, Fischer T. Carnivore Diet: A Scoping Review of the Current Evidence, Potential Benefits and Risks. Nutrients. 2026. https://doi.org/10.3390/nu18020348
Klement RJ, Matzat JS. Subjective Experiences and Blood Parameter Changes in Individuals From Germany Following a Self-Conceived "Carnivore Diet": An Explorative Study. Cureus. 2025. https://doi.org/10.7759/cureus.82521
Norwitz NG, Soto-Mota A. Case report: Carnivore-ketogenic diet for the treatment of inflammatory bowel disease: a case series of 10 patients. Frontiers in Nutrition. 2024. https://doi.org/10.3389/fnut.2024.1467475
Squire P, Ghosh M. Acute pancreatitis caused by severe hypertriglyceridemia in a 61-year-old man on a carnivore diet. CMAJ. 2026. https://doi.org/10.1503/cmaj.250499
Goedeke S, Murphy T, Rush A, et al. Assessing the Nutrient Composition of a Carnivore Diet: A Case Study Model. Nutrients. 2024. https://doi.org/10.3390/nu17010140

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