Scientists have produced the strongest experimental evidence yet that a specific molecule made by gut bacteria, in response to a high-fat Western diet, actively speeds colorectal tumor growth rather than simply appearing alongside it. The work, from the Technical University of Munich, RWTH Aachen University, and the German Institute of Human Nutrition Potsdam-Rehbrücke, appears in the journal Gut.
The finding lands in the middle of an unsettled question that affects many households. Colorectal cancer is rising in adults under 50, and diet is the risk factor people most want a clear answer about. This research does not deliver a diet prescription. What it does is fill in the biological chain of events connecting fatty food to tumor growth, which has been missing for decades.
