A study presented at the Annual Meeting of the European Association for the Study of Diabetes in Milan analyzed data from 89,953 adults in the French NutriNet-Santé cohort. Over a median follow-up of 7.2 years, 966 new cases of type 2 diabetes were recorded. Compared with participants in the lowest intake group, those with the highest estimated consumption of meat-derived Neu5Gc had a 63% greater risk of developing the disease; those in the second-highest group faced a 41% higher risk.
Neu5Gc is a sugar found naturally in most mammals but not produced by humans due to an ancient mutation in the CMAH gene. It is particularly common in beef and lamb and can enter the body through diet. Because the human immune system may recognize it as foreign, the sugar can become incorporated into tissues and provoke prolonged immune activity known as xenosialitis. The researchers suspect this chronic inflammation helps explain the red meat–diabetes connection beyond weight gain and total meat intake.
The findings are observational and preliminary, so they cannot prove causation. The association weakened after adjusting for body mass index but remained statistically significant, suggesting that the inflammatory mechanism may act partly independently of body fat. The authors note that higher intakes of meat-derived Neu5Gc appeared to be associated with progressively higher diabetes risk, though the exact threshold for triggering an immune response remains unknown.