Summary of the Carnivore Diet (CD) Study findings:
This text presents a scoping review of the current evidence surrounding the Carnivore Diet (CD). here’s a breakdown of the key findings:
What the Studies Looked Like:
* Highly Restricted: Most studies excluded plant-based foods entirely. Many focused specifically on red meat, with variations in fat content.
* Variations in CD: Some studies examined ketogenic versions of the CD, or used it as a temporary elimination diet. One involved a zero-carbohydrate diet primarily of meat (including organ meats).
* Methodological Issues: Many studies relied on questionnaires, theoretical dietary plans, or small sample sizes. There was a lack of control groups and short intervention durations.
Nutritional Aspects:
* Deficiencies: Intakes of several nutrients were often below recommended Dietary Reference Values (DRVs), including thiamin, magnesium, iron, calcium, potassium, iodine, folate, vitamin C, and vitamin D.
* Excesses: Vitamin A intake (from liver) was frequently enough above recommended levels.
* Fiber: Dietary fiber intake was consistently low.
Cardiometabolic & Health Effects:
* potential Short-Term Benefits: Some studies reported positive effects on disease course, allowing for medication reduction. Improvements were seen in some lab parameters (triglyceride/HDL ratio, C-reactive protein, γ-glutamyl transferase) and in iron status/fecal calprotectin in IBD patients.
* Negative Cardiometabolic Effects: Increases were observed in total cholesterol (TC), platelet counts, and LDL-C (bad cholesterol). While triglycerides and glycated hemoglobin improved in those with metabolic disorders, LDL-C and TC still increased.
* Kidney Issues: One case report showed health deterioration and kidney stones during the CD, which resolved after stopping.
* Gut Microbiome: One study found no important difference in gut microbiome diversity between CD and omnivorous diets.
Social & Psychological Aspects:
* Motivations: People adopted the CD for perceived health benefits, and to a lesser extent, ethical reasons or a sense of “naturalness.”
* Positive Experiences: Many reported improved overall health, simplicity, and enjoyment of the diet.
* Social Challenges: Following the CD frequently enough lead to social conflict, difficulties with healthcare professionals, and strained relationships.
Conclusions:
The review concludes that the CD may offer short-term improvements, potentially due to placebo effects, subjective feelings, or metabolic changes from ketosis. However, it also carries risks of:
* Cardiovascular & Renal Complications
* Micronutrient Deficiencies
* Low Fiber intake
* Adverse Lipid Profile Changes
Crucially, the authors state that due to the limitations of the current research, the long-term safety of the CD is unknown and long-term adherence is not recommended.
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