digest
Short Summary
Main recommendation: Dr. Eric Westman does not endorse the carnivore diet outright; he calls it a mixed bag that deserves "eyes wide open" caution, pending new prospective research. He argues it may be able to supply essential nutrients and may help some people, but long-term safety data are lacking, so it should only be followed under the guidance of an experienced practitioner.
Key Points
- Westman says the key test for any diet is whether it provides all the nutrients we currently believe we need, while noting that new vitamins and uses are still being discovered.
- He cites Amber O'Hearn's review "Can a Carnivore Diet Provide All Essential Nutrients?" (Current Opinion in Endocrinology and Diabetes) as a scholarly starting point, and says he personally believes the carnivore diet can plausibly cover essential nutrients.
- He reports that some of his own patients addressed medical concerns by cutting out vegetables and following carnivore-type diets, which he describes as examples he has personally observed of short-term healing, not proof of long-term benefit.
- He stresses that social-media surveys (such as a Harvard-group survey of about 2,000 carnivore-diet respondents) are not sufficient evidence because of selection bias, and that prospective trials are needed.
- He is skeptical of the "ancestral" argument alone, noting humans may have evolved to need nutrients not available in the past, and says dismissing the diet merely because long-term data are missing reflects a lack of curiosity, not necessarily being unscientific.
Details Worth Noting
- Concrete instructions: Westman gives no step-by-step meal plan. His actionable guidance is: (1) if you try this diet, do it under the direction of someone who has guided many people through it; (2) measure the blood tests doctors typically order to confirm you are in good health; (3) do not accept treatment decisions based only on standard lab ranges, because on keto or carnivore diets ketones are normal and may be flagged abnormal against carbohydrate-eater reference values; (4) if following a vegetarian or vegan diet, be aware of vitamin B12 needs; (5) on a carnivore diet, consider calcium, which may be obtained from bones or fish if bones are not eaten.
- Westman references the video "Homo Carnivorous" by Barry Groves, with the key comparative gut anatomy and nutrient absorption section roughly from 7:43 to 14:48, arguing humans are anatomically closer to carnivores.
- Groves's argument that mammals generally absorb about 70 percent of calories as fat (including ruminants via gut bacteria) and that carnivores like lions eat fatty meats, leading to the claim humans should do the same, is described by Westman as a stretch, though intriguing.
- Westman notes that vitamin C deficiency (scurvy) was absent in the Inuit, who ate carnivorously, suggesting either adequate intake or lower requirements without a glucose-based metabolism.
- He cautions that nutrient deficiencies can take years to appear, which is why long-term monitoring matters.
Bottom Line
The carnivore diet is plausibly nutritionally adequate and may benefit some individuals, but Westman withholds full endorsement until long-term, prospective research exists; anyone considering it should proceed carefully with professional oversight and appropriate lab monitoring.
