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The mammal-derived molecule Neu5Gc may trigger chronic inflammation that harms insulin production, preliminary research suggests.
Scientists have long tied the consumption of red meat to type 2 diabetes, but the usual explanations, saturated fat, calories, weight gain, have never fully accounted for the connection.
A new analysis of nearly 90,000 French adults points to a specific molecule in beef and lamb as part of the hidden driver. People with the highest intake of a sugar called N-glycolylneuraminic acid, or Neu5Gc, had a 63% higher risk of developing type 2 diabetes than those with the lowest intake.
The findings were presented at the European Association for the Study of Diabetes annual meeting in Milan, held from September 28 to October 2, 2026. The second-highest intake group showed a 41% higher risk.
A sugar your immune system treats as foreign
Neu5Gc is produced by most mammals but not by humans, after an ancient mutation knocked out the gene needed to make it. When people eat beef or lamb, the molecule gets built into their own tissues, and the immune system responds by producing antibodies against it.
Lead author Dr. Leopold Fezeu of Université Sorbonne Paris Nord in Bobigny said the resulting low-grade chronic inflammation, which the researchers call xenosialitis, “could impair insulin action and the insulin-producing cells of the pancreas.”
The team drew on the NutriNet-Santé cohort, tracking 89,953 adults for a median of 7.2 years. During that time, 966 developed type 2 diabetes. Men in the top intake group ate about 97 grams of red meat a day, 136 grams with processed meats added, while women ate 73 grams, or 96 grams with processed meats.
Not every meat behaves the same
Beef and lamb carry the highest Neu5Gc levels, with smaller amounts in pork, game, and dairy. The analysis found no significant link between dairy-derived Neu5Gc and diabetes risk, likely because dairy contains far less of the sugar and is consumed in smaller portions.
Fezeu stressed that the figure is relative, not absolute. “It does not mean that 63% of high consumers will develop diabetes,” he told Medical News Today, adding that “the absolute difference in risk for any individual is much smaller.”
Obesity accounted for only about 13% of the association, meaning most of the diabetes risk tied to Neu5Gc operated independently of body fat. The findings are preliminary and have not yet been peer-reviewed. Fezeu said his team plans to measure anti-Neu5Gc antibodies directly in future work. In the meantime, he noted, “current dietary guidelines already recommend limiting red meat intake.”
