Cross-sectional studyindependent cross-checkabstract checked I-VEG-109 standard review

Survey of meat-only dieters reports satisfaction

Behavioral Characteristics and Self-Reported Health Status among 2029 Adults Consuming a "Carnivore Diet".

Overview

Lennerz BS et al.. Curr Dev Nutr 2021 · PMID 34934897 · DOI 10.1093/cdn/nzab133

Over 2,000 self-selected carnivore dieters reported few side effects and feeling better, but their reported LDL cholesterol was markedly high.

Does the study support the specific claim? Partly · Methodological quality: very low

Study explained simply

What did the researchers want to find out?: Describe people on a carnivore diet.
How was the study done?: Online survey.
How many people, animals or samples were studied?: 2,029 adults.
What was actually found?: High satisfaction, few reported symptoms, high LDL-C.
How large was the observed effect?: Descriptive only.
What do the results mean in everyday life?: Some people feel well on such diets in the short term.
What are the study's limitations?: Self-selected, self-reported, no controls.
What does it say about Elawady's specific claim?: Weak support; cannot show long-term health.
Do the results apply to Germany and Europe?: Low.
What can explicitly not be concluded from this study?: Cannot show safety or benefit over time.

Authors: Lennerz BS et al.
Journal: Curr Dev Nutr
Year: 2021
Identifier: PMID 34934897 DOI 10.1093/cdn/nzab133
Verification: verified – PubMed efetch 2026-10-26; Crossref 2026-10-26
Retracted: no
Corrections: none
Extent checked: abstract only
Conflicts of interest and funding: Funding (PubMed grant list): NCCIH NIH HHS; NIDDK NIH HHS

What are the dietary practices and self-reported health of adults following a "carnivore diet"?

Study design: Cross-sectional study – Cross-sectional social-media survey of self-identified carnivore-diet consumers
Population: Adults reporting a carnivore diet for >=6 months (recruited via social media)
Country: International (mostly USA)
Period: 30 March-24 June 2020
Sample size: 2,029
Inclusion and exclusion criteria: not stated in abstract

Exposure / intervention: Carnivore diet (<10% ate vegetables, fruits or grains more than monthly)
Comparator: Self-reported pre-diet status
Endpoints: Self-reported symptoms, satisfaction, conditions, BMI, lipids, HbA1c
Statistical methods: Descriptive

Results: Median 14 months on diet; adverse symptoms <1% to 5.5%; 95% reported improved overall health; median BMI 27.2 to 24.3; reported LDL-C markedly elevated (172 mg/dL), HDL 68 mg/dL, TG 68 mg/dL; diabetes medication reductions reported.
Absolute risks: not reported
Authors' conclusion: Adults consuming a carnivore diet experienced few adverse effects and reported benefits and high satisfaction; CVD risk factors variably affected; generalizability and long-term effects require further study.

Descriptive percentages only; no comparison group, so no effect estimate.

The only human data found that point in the direction of the claim (short-term self-reported wellbeing without plant foods).

Lietz 2026 scoping review: nutrient deficiency risks and elevated LDL; cohort meta-analyses.

Self-selected international sample; low transferability.

Very low-quality support; cannot establish long-term safety; elevated LDL-C is a recognised risk factor.

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	very low
Risk of bias	high
Precision of results	not applicable
Directness	direct
Reproducibility	not replicated
Consistency with the overall evidence	unknown
Regional transferability	low
Adequacy of the interpretation (by the archive)	not applicable

Prospective controlled studies of long-term outcomes.