Study links Neu5Gc sugar in red meat to 63% higher type 2 diabetes risk

A NutriNet-Santé observational study presented at the EASD Annual Meeting links high consumption of Neu5Gc, a mammal-derived sugar found in red meat like beef and lamb, to a 63% increased risk of type 2 diabetes. Because humans lack the CMAH gene, the body treats incorporated Neu5Gc as a foreign antigen, triggering chronic inflammation known as xenosialitis. Analysis of 89,953 French adults showed this elevated risk was specific to meat sources rather than dairy, with obesity accounting for only 13% of the association.

NutriNet-santé findings on Neu5Gc and diabetes

• ▪A NutriNet-Santé observational study presented at the Annual Meeting of The European Association for the Study of Diabetes in Milan linked high intake of meat-derived N-glycolylneuraminic acid (Neu5Gc) sugar to a 63% higher risk of developing type 2 diabetes.
• ▪When accounting for all dietary sources of Neu5Gc combined, NutriNet-Santé study participants in the highest intake group faced a 37% higher risk of type 2 diabetes compared with those in the lowest group.
• ▪Researchers at Université Sorbonne Paris Nord estimated that obesity accounted for approximately 13% of the statistical relationship between meat-derived Neu5Gc consumption and type 2 diabetes risk.
• ▪The NutriNet-Santé study found that consumption of Neu5Gc derived from dairy products was not associated with an increased risk of type 2 diabetes.

NutriNet-santé study methodology and cohort

• ▪The NutriNet-Santé study estimated individual Neu5Gc exposure by evaluating three 24-hour dietary records per participant against a validated food composition database.
• ▪In the NutriNet-Santé study, median daily red meat intake in highest vs lowest Neu5Gc groups was 97g vs 5g (136g vs 21g including processed) for men, and 73g vs 0g (96g vs 9g total) for women.
• ▪During a median follow-up period of 7.2 years in the NutriNet-Santé study, researchers documented 966 new cases of type 2 diabetes.
• ▪ The NutriNet-Santé observational study tracked 89,953 French adults with an average age of 42 years, 79% of whom were women, with no initial history of diabetes or cancer.

Biological mechanism of Neu5Gc in humans

• ▪When consumed through red meat, Neu5Gc accumulates in human tissues as a foreign xeno-autoantigen, triggering antibody responses and persistent inflammation known as xenosialitis.
• ▪Humans lack the ability to naturally produce the sugar Neu5Gc due to an evolutionary mutation in the CMAH gene.

Broader research on red meat and diabetes

• ▪The September 2024 Lancet Diabetes & Endocrinology meta-analysis determined that daily intake of 50 grams of processed meat increased diabetes risk by 15%, 100 grams of unprocessed red meat increased risk by 10%, and 100 grams of poultry increased risk by 8%.
• ▪A September 2024 federated meta-analysis in The Lancet Diabetes & Endocrinology evaluating adults across 31 global cohorts identified over 107,000 incident cases of type 2 diabetes.
• ▪A 2023 study covering over 200,000 participants found that high overall red meat consumption was associated with a 62% higher risk of developing type 2 diabetes.

Dietary substitution recommendations

• ▪Findings from the Lancet Diabetes & Endocrinology meta-analysis and prior 2023 research indicated that replacing red meat with nuts, legumes, or dairy significantly lowers the risk of developing type 2 diabetes.
• ▪Lead author Dr. Leopold Fezeu suggested that substituting beef and lamb with poultry or plant-based protein sources could reduce exposure to meat-derived Neu5Gc.