Red meat has historically provided concentrated nutrition, but contemporary science links its consumption to health risks and ecological damage, per an interdisciplinary review in The Quarterly Review of Biology.

Human success hinged on dietary flexibility rather than meat-centric eating, as early humans adapted to diverse environments and seasonal resources.

Three million years of hominin dietary history, integrated with archaeology, epidemiology, and molecular biology, suggests that changes in meat availability, composition, production, and cultural role—not meat itself—drive today’s concerns.

The shift to agriculture about 10,000–12,000 years ago narrowed diets to staples like grains, leading to nutritional gaps such as iron deficiency compared with hunter-gatherer diets.

Today red meat supports a global industry valued around $1.3 trillion, with industrial production expanding availability and frequency of consumption.

Early humans valued animal foods alongside plants, with fats, bone marrow, organs, and brain tissue likely delivering extra calories and essential lipids for brain development.

Conclusion: the evolutionary value of dietary flexibility should inform future dietary choices and policy, balancing historical benefits with current health and environmental costs.

A proposed mechanism, xenosialitis via Neu5Gc, suggests red meat could trigger chronic inflammation linked to atherosclerosis, colorectal cancer progression, and possibly cognitive decline.

Rather than promoting blanket elimination of red meat, the authors advocate a flexible, diverse diet that reduces reliance on red meat while recognizing its historical role.

Industrial meat production is estimated to contribute about 15% of global greenhouse gas emissions, drive deforestation, pollute water, and foster antibiotic resistance through heavy animal-use.

Epidemiological data connect higher red and processed meat intake with cardiovascular disease, type 2 diabetes, colorectal cancer, and higher all-cause mortality, with processed meat classified as a Group 1 carcinogen and unprocessed red meat as probably carcinogenic.