Sugar in red meat linked to 63% higher type 2 diabetes risk in large French study

Preliminary findings point to chronic inflammation as a possible mechanism, but researchers cannot yet separate Neu5Gc from red meat itself

By LineZotpaper

Published19 October 2026

Read Time3 min

A large observational study of nearly 90,000 French adults has found that people with the highest intake of a sugar naturally present in red meat face a 63% higher risk of developing type 2 diabetes, researchers reported at the annual meeting of the European Association for the Study of Diabetes in Milan. The findings lend support to the idea that chronic inflammation, rather than body weight alone, helps explain the long-standing link between red meat and diabetes.

Researchers analysed dietary and health data from 89,953 adults in the NutriNet-Santé cohort, a French study that tracks how nutrition and lifestyle affect health. Participants, 42 years old on average and 79% women, were free of type 2 diabetes and cancer at enrolment. Over a median follow-up of 7.2 years, 966 new cases of type 2 diabetes were recorded.

The sugar, N-glycolylneuraminic acid (Neu5Gc), is common in beef and lamb, with smaller amounts in dairy and in meats such as pork, rabbit, goat and game. Compared with participants who consumed the least meat-derived Neu5Gc, those in the highest intake group had a 63% greater risk of type 2 diabetes, while the second-highest group had a 41% greater risk. The association held after adjustment for age, sex, physical activity, overall diet quality, smoking and existing medical conditions, and weakened but remained significant after body mass index was added.

Neu5Gc is produced by most mammals, but humans lost the ability to make it after an ancient mutation in the CMAH gene. Because the body does not recognise it, the sugar can provoke an immune response when absorbed into tissues. Scientists class it as a xeno-autoantigen, and the resulting chronic immune activity, called xenosialitis, has previously been linked to cardiovascular disease and cancer.

"Our findings support chronic inflammation as a specific mechanism linking red meat consumption with T2D, partly beyond the amount of red meat a person eats and partly independent of body fat," said lead author Dr Leopold Fezeu of the Université Sorbonne Paris Nord, Bobigny, France.

Obesity appeared to explain only about 13% of the association, suggesting factors other than weight may be at work. However, the researchers stressed important limits. When the analysis additionally accounted for total red meat consumption, the relationship weakened and was no longer statistically significant, meaning they cannot determine whether Neu5Gc itself, rather than other components of red meat, drives the risk. Higher Neu5Gc intake from dairy was not associated with diabetes risk.

"Although we do not know exactly what levels of Neu5Gc trigger an immune response, our data suggest that higher intakes of meat-derived Neu5Gc are associated with a progressively higher risk of T2D," Fezeu said.

Analysis

Why This Matters

The finding offers a plausible biological pathway, chronic inflammation, for a connection that has mostly been measured statistically.
It suggests diabetes risk from red meat may depend on more than weight gain, since obesity explained only a small share of the association.
The results are preliminary and observational, so dietary advice is unlikely to change until the link is confirmed.

Background

Red meat consumption has long been associated with a higher risk of type 2 diabetes, but the reasons have been debated. This study is an attempt to test a specific mechanism. Neu5Gc is a sugar most mammals produce, but an ancient mutation in the human CMAH gene means the human body treats dietary Neu5Gc as foreign and mounts an immune response against it. That chronic immune activity has previously been linked to cardiovascular disease and cancer, and the researchers suspected it might also contribute to diabetes. This is described as the first large prospective investigation of that idea.

Key Perspectives

The researchers: The team, led by Dr Leopold Fezeu, interprets the results as support for chronic inflammation as a mechanism linking red meat to type 2 diabetes, operating partly beyond the amount of meat eaten and partly independent of body fat. Public health and nutrition researchers: The association between red meat and diabetes is well established in the literature, and this study adds a candidate explanation that could eventually inform dietary guidance, though the researchers themselves caution against drawing firm conclusions. Skeptics: The evidence is observational and based on self-reported diet. The most significant limitation is that once total red meat consumption was taken into account, the Neu5Gc association lost statistical significance, so the sugar cannot yet be separated from red meat itself.

What to Watch

Whether the results hold up after peer review, since the findings were presented at a conference and described as preliminary.
Whether further studies confirm that Neu5Gc-driven inflammation actually disturbs insulin-producing cells or the body's response to insulin.
Whether research can establish the proposed threshold at which Neu5Gc accumulation triggers an immune reaction.

Sources

Scientists link a strange sugar in red meat to a 63% higher diabetes risk · Latest Science News -- ScienceDaily

Checked

12 claims in this story checked against 1 source: 11 supported.

Show each claim

SupportedThe highest consumers of meat-derived Neu5Gc had a 63% higher type 2 diabetes risk than the lowest consumers.Latest Science News -- ScienceDaily: “Researchers found that participants with the highest intake of meat-derived Neu5Gc had a 63% higher risk of developing type 2 diabetes (T2D) compared with those who consumed the least.”
SupportedPreliminary findings point to chronic inflammation as a possible mechanism linking red meat with type 2 diabetes, partly beyond body weight.Latest Science News -- ScienceDaily: “Preliminary findings from a large observational study suggest that people who consume the most of this sugar face a substantially greater risk of developing the disease, potentially because of its effects on the immune system and chronic inflammation.”
SupportedResearchers cannot determine whether Neu5Gc itself, rather than other red-meat components, is responsible for the increased risk.Latest Science News -- ScienceDaily: “This means the researchers cannot determine whether Neu5Gc itself (rather than other components of red meat) is responsible for the increased risk.”
SupportedThe research was a large French observational study involving nearly 90,000 adults.Latest Science News -- ScienceDaily: “the scientists analyzed dietary and health information from 89,953 adults participating in NutriNet-Santé, a large French observational study that follows people over time”
SupportedThe findings were presented at the European Association for the Study of Diabetes annual meeting in Milan.Latest Science News -- ScienceDaily: “The findings were presented at the Annual Meeting of The European Association for the Study of Diabetes (EASD) in Milan, Italy.”
SupportedFezeu said: "Our findings support chronic inflammation as a specific mechanism linking red meat consumption with T2D, partly beyond the amount of red meat a person eats and partly independent of body fat."Latest Science News -- ScienceDaily: ““Our findings support chronic inflammation as a specific mechanism linking red meat consumption with T2D, partly beyond the amount of red meat a person eats and partly independent of body fat,” said lead author Dr. Leopold Fezeu”
SupportedFezeu said: "Although we do not know exactly what levels of Neu5Gc trigger an immune response, our data suggest that higher intakes of meat-derived Neu5Gc are associated with a progressively higher risk of T2D."Latest Science News -- ScienceDaily: ““Although we do not know exactly what levels of Neu5Gc trigger an immune response, our data suggest that higher intakes of meat-derived Neu5Gc are associated with a progressively higher risk of T2D.””
SupportedDuring a median follow-up of 7.2 years, researchers recorded 966 new type 2 diabetes cases.Latest Science News -- ScienceDaily: “During a median follow-up period of 7.2 years, researchers recorded 966 new cases of type 2 diabetes.”
SupportedThe second-highest meat-derived Neu5Gc intake group had a 41% greater type 2 diabetes risk than the lowest group.Latest Science News -- ScienceDaily: “Those in the second-highest group had a 41% greater risk (men and women combined).”
SupportedThe association remained significant after adjustment for established risk factors and weakened but remained significant after BMI was added.Latest Science News -- ScienceDaily: “The association remained statistically significant after researchers accounted for several established diabetes risk factors, including physical activity, overall diet, smoking, and existing health conditions. It became weaker after body mass index (BMI) was also considered, but remained significant.”
SupportedObesity accounted for approximately 13% of the association between meat-derived Neu5Gc and type 2 diabetes.Latest Science News -- ScienceDaily: “According to the researchers' estimates, obesity accounted for approximately 13% of the relationship between meat-derived Neu5Gc consumption and type 2 diabetes.”
Partly supportedNeu5Gc occurs in smaller amounts not only in dairy but also in pork, rabbit, goat and game.Latest Science News -- ScienceDaily: “The analysis included a broad range of red meats, such as beef, lamb, pork, rabbit, goat, and game. Processed meats (such as bacon, sausages and cured meats) were evaluated as a separate category, while dairy products were analyzed independently.”