Red-meat sugar linked to diabetes risk, but association fades after intake is considered

A preliminary study found a higher type 2 diabetes risk among people consuming the most Neu5Gc, but the link was no longer statistically significant after researchers accounted for total red-meat intake.

A preliminary French study presented at the European Association for the Study of Diabetes meeting in Milan has drawn attention to Neu5Gc, a sugar found in red meat that researchers say may be linked to a higher risk of type 2 diabetes. According to Medical Daily, people in the study who consumed the most Neu5Gc had a 63% higher risk of developing the condition than those who consumed the least. But the same report notes an important limitation: once total red meat intake was taken into account, the association weakened and was no longer statistically significant.

The research, led by Leopold Fezeu of Université Sorbonne Paris Nord, followed 89,953 adults in the NutriNet-Santé cohort, a long-running French nutrition study. Participants were, on average, 42 years old, and most were women. None had type 2 diabetes or cancer when they enrolled. As ScienceDaily reported, the investigators estimated Neu5Gc intake from three 24-hour food records and tracked participants for a median of 7.2 years, during which 966 people developed type 2 diabetes.

The study’s strongest signal appeared at the top of the intake range. Compared with the lowest exposure group, the highest group had a 63% greater risk, while the second-highest group had a 41% higher risk. The middle groups did not differ significantly from the lowest group. Even so, the results remained observational, meaning they can show correlation but not prove that Neu5Gc causes diabetes. The researchers also emphasised that red meat itself is the main source of the sugar, making it difficult to separate the effect of Neu5Gc from other aspects of meat consumption.

That distinction matters. When the researchers adjusted for overall red meat intake, the relationship between Neu5Gc and diabetes risk lost statistical significance, suggesting that other components of red meat may be involved. Fezeu said in the release that there may be differences between sources of the sugar, and that heme iron, another element of red meat, deserves further study. The report also noted that dairy-derived Neu5Gc was not associated with a higher diabetes risk, and that obesity explained only a modest share of the association.

The findings arrive against a backdrop of widespread diabetes in the United States. The Centers for Disease Control and Prevention says more than 40 million Americans have diabetes, and roughly 90% to 95% of those cases are type 2 diabetes. Risk is higher among people who are overweight, physically inactive, 45 or older, or who have a family history of the disease. On that basis, the study is best read as a prompt for caution rather than alarm: adults with known risk factors may want to discuss screening and diet with a clinician, while researchers continue to test whether Neu5Gc, inflammation and other red meat-related compounds are actually driving the observed link.