What we've found so far is that in some lean, active people, a carnivore diet may be linked to high levels of both LDL (often called "bad" cholesterol) and HDL (often called "good" cholesterol), along with low triglycerides [1]. Our analysis of the available evidence currently includes a small number of case reports, but no controlled studies or refuting data.
The evidence we've reviewed leans toward the idea that this unique cholesterol pattern can appear in certain individuals who are physically fit and eat only animal products [1]. In a couple of real-life examples, people following a strict carnivore diet showed blood lipid results that would typically seem conflicting—very high HDL, which is usually considered protective, alongside very high LDL, which is usually seen as a risk factor, and very low triglycerides, which is generally favorable [1]. These individuals were lean and physically active, suggesting that body composition and fitness do not necessarily prevent this pattern.
We don’t yet know how common this response is, or what long-term effects it might have. Our current analysis is based on only a few observations, so we can’t determine whether this pattern is typical, safe, or risky for most people on a carnivore diet. There is not enough evidence to say whether these changes are harmful, neutral, or possibly even normal in the context of a meat-only diet.
Because the data is so limited, we can only say that this pattern has been seen in a few cases. We don’t have enough information to predict who might experience it or what it means over time.
Practical takeaway: If you're on a carnivore diet and are otherwise lean and active, your cholesterol numbers might look unusual—high in both "good" and "bad" types, with low triglycerides. This has been seen before, but we don’t yet know what it truly means for health.
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