Fat Metabolism, Not Ketones, Drives Keto's Cancer Effects in Mice

A Nature study in mice found that a ketogenic diet can accelerate small-intestine tumors while suppressing colon tumors, and that these effects are driven by fatty acid oxidation and subsequent activation of PPARs—not by ketone bodies. This challenges the idea that ketones explain keto’s impact on cancer, suggesting fat metabolism is the key driver. While having implications for understanding cancer biology, the findings are preclinical and human relevance remains unclear; commercially available ketone supplements are unlikely to replicate these effects.