Scientists are genuinely divided on this question.

Not medical advice — just what the research says.

What's still open

What the evidence found 3 findings
Based on 4 sources:
PMC (PubMed Central) peer-reviewed View
Animal (Elsevier) peer-reviewed View
PubMed peer-reviewed View
PMC peer-reviewed View
Based on 11 sources:
PMC (PubMed Central) peer-reviewed View
National Cancer Institute institutional View
MD Anderson Cancer Center institutional View
World Health Organization institutional View
Harvard T.H. Chan School of Public Health Nutrition Source institutional View
PMC/NCBI peer-reviewed View
Oncology Central news View
PMC peer-reviewed View
Fred Hutch institutional View
European Prospective Investigation into Cancer and Nutrition peer-reviewed View
Journal of Nutrition peer-reviewed View
Based on 7 sources:
American Grassfed Association institutional View
Mayo Clinic institutional View
PMC (PubMed Central) peer-reviewed View
Texas A&M University Animal Science Department institutional View
PMC (PubMed Central) peer-reviewed View
The Organic Center institutional View
Environmental Working Group institutional View
Sources 22 findings
2015 World Health Organization institutional-review View
2015 Harvard T.H. Chan School of Public Health institutional-review View
2015 PMC/NCBI peer-reviewed-study View
PMC (PubMed Central) peer-reviewed-study View
Animal (Elsevier) peer-reviewed-study View
PubMed peer-reviewed-study View
PMC peer-reviewed-study View
PMC (PubMed Central) peer-reviewed-study View
National Cancer Institute institutional-review View
MD Anderson Cancer Center institutional-review View
Oncology Central News report View
PMC peer-reviewed-study View
2024 Fred Hutch institutional-review View
European Prospective Investigation into Cancer and Nutrition peer-reviewed-study View
Journal of Nutrition peer-reviewed-study View
PMC (PubMed Central) peer-reviewed-study View
Texas A&M University Animal Science Department institutional-review View
PMC (PubMed Central) peer-reviewed-study View
American Grassfed Association institutional-review Advocacy / podcast View
Mayo Clinic institutional-review View
The Organic Center institutional-review Advocacy / podcast View
2026 Environmental Working Group institutional-review Advocacy / podcast View
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Generated by reaso.ai's editorial pipeline: claim restated, scientific consensus classified via 3-run majority vote, 22 findings enriched with attribution and study type, narrative written in neutral voice. No individual researcher has signed off on this specific analysis — see methodology for how the pipeline works. Built with Claude Sonnet by Anthropic. Updated April 18, 2026. How we do this →

Written by AI. Sources are linked for verification.