The most frequent claims associated with the carnivore diet involve:

The high satiety of protein and fat naturally leads to caloric deficit without the psychological strain of restrictive portion control. Criticisms and Risks

The Carnivore Diet: Evolution, Mechanics, and Modern Discourse

Without fruit and vegetables, there are risks of low Vitamin C, folate, and phytonutrients, though "nose-to-tail" eating (consuming organ meats) is often proposed as a solution.

Proponents of the carnivore diet often cite the "ancestral health" model. They argue that for the vast majority of human evolution, particularly during the Pleistocene epoch, large fatty ruminants were the primary caloric source for early hominids. This perspective suggests that the human digestive tract—characterized by a high-acidity stomach and a relatively short colon—is biologically optimized for protein and fat rather than the fibrous cellulose found in many plants. From this view, the Agricultural Revolution is seen as a recent "mismatch" that introduced inflammatory lectins, phytates, and excessive sugars into the human diet. Nutritional Mechanics

Long-term elimination of fiber may alter the gut microbiome in ways that are not yet fully understood, potentially impacting colon health.