French researchers found that people with the highest estimated intake of Neu5Gc, a sugar molecule absorbed from red meat, had a 63% higher relative risk of developing type 2 diabetes , but the observational findings do not prove cause and effect.
A sugar molecule found in red meat may help explain why the food has long been associated with a higher risk of type 2 diabetes, according to early findings presented at the European Association for the Study of Diabetes meeting in Milan. The compound, N-glycolylneuraminic acid, or Neu5Gc, is unusual because humans do not make it themselves, yet can absorb it from foods such as beef, lamb and, in smaller amounts, dairy products.
The French analysis drew on data from 89,953 adults in the NutriNet-Santé cohort, most of them women, with an average age of 42 at the start of the study. None had diabetes or cancer when they entered the research. Participants recorded their diets in three 24-hour food diaries, and researchers estimated Neu5Gc intake using measured values in different foods. Over a median follow-up of 7.2 years, 966 people developed type 2 diabetes. Those in the highest fifth of estimated intake had a 63% greater risk than those in the lowest fifth after accounting for age, sex, physical activity, diet quality, smoking and existing health conditions.
Researchers cautioned that the figure is a relative measure, not a forecast that 63% of high consumers will develop diabetes. The pattern was also uneven. Risk rose mainly in the top two intake groups, with the second-highest group showing a 41% increase, while the lower groups did not differ significantly from the reference group. In the highest intake category, men consumed a median of 97 grams of red meat a day and women 73 grams, though the study was observational and did not identify a safe threshold.
The biological theory centres on inflammation. Scientists have proposed that Neu5Gc can become incorporated into human tissues, where the immune system may treat it as foreign and generate low-grade inflammation, a process sometimes described as xenosialitis. That, in turn, could interfere with insulin action and damage the pancreatic cells that produce insulin. Earlier work has supported parts of that idea. Research reported in 2003 found that people could absorb small amounts of pork-derived Neu5Gc, and a 2020 study in BMC Medicine using the same French cohort linked higher intake with higher anti-Neu5Gc antibody levels in a smaller group of participants.
The latest findings also suggest that the source of the molecule matters. Dairy-derived Neu5Gc was not linked with diabetes in the French data, and when researchers looked at total Neu5Gc from all foods, the association was weaker than for red meat alone. The same French work also found that the pattern was present in both men and women, although there were too few cases to analyse the sexes separately. Earlier laboratory research published in the Proceedings of the National Academy of Sciences found that red meat is rich in Neu5Gc and that the molecule can be incorporated into human tissue, while an NIH summary of a later study noted that gut bacteria may help release Neu5Gc from meat in the digestive tract.
Even so, the study does not prove that Neu5Gc causes diabetes, and it did not test whether replacing red meat with other foods changed risk. The researchers said their next steps include measuring anti-Neu5Gc antibodies in larger groups and examining the molecule alongside haem iron, another component of meat often studied in relation to chronic disease. For now, the work adds another possible mechanism to a long-running debate about red meat and metabolic health, but it stops short of offering a clear reason to single out Neu5Gc on its own.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
