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0This research explores how a ketogenic diet (KD) influences intestinal tumor growth, specifically within the small intestine of mice predisposed to cancer. The study reveals that while a KD increases small-intestinal stem cell activity and accelerates tumorigenesis, these effects are driven by the oxidation of dietary fats rather than the production of ketone bodies. Through genetic manipulation, the authors demonstrate that neither inhibiting nor augmenting ketone metabolites impacts tumor burden, contradicting previous theories regarding the tumor-suppressive nature of ketones in this organ. Instead, the diet triggers PPAR signaling and fatty acid oxidation, pathways that enhance the regenerative and malignant potential of stem cells. These findings suggest that the high lipid content of ketogenic diets may pose risks for individuals with a genetic susceptibility to intestinal cancers. Ultimately, the work emphasizes that the metabolic breakdown of fats, not the resulting ketones, is the primary driver of diet-induced cancer progression.
References:
Shay J E S, Chi F, Tzouanas C N, et al. Ketogenic diet mediates intestinal tumorigenesis through lipids not ketones[J]. Nature, 2026: 1-10.
