Sugar in red meat that human body recognizes as foreign may help explain food’s link to type 2 diabetes, preliminary findings suggest. Preliminary findings from French study of nearly 90000 adults linked higher intake of meat-derived sugar called Neu5Gc with greater type 2 diabetes risk.

Participants with highest intake had 63 percent higher risk than those with lowest intake, although observational research cannot establish sugar caused disease directly.

Presented At EASD Annual Meeting

Findings were presented at Annual Meeting of European Association for Study of Diabetes, researchers investigating whether immune response could explain association.

Lead author Dr Leopold Fezeu of Université Sorbonne Paris Nord in Bobigny, France said findings support chronic inflammation as specific mechanism linking red meat consumption.

Fezeu said findings support chronic inflammation as specific mechanism linking red meat consumption with T2D, partly beyond amount eaten and independent of body fat.

Why Body Recognizes This Sugar As Foreign

Most mammals naturally produce Neu5Gc, but ancient mutation in CMAH gene left humans unable to make it, encountering it through food. We nevertheless encounter it in food, particularly beef and lamb, with smaller amounts in dairy products, entering human tissues after consumption.

After consumption, Neu5Gc can enter human tissues, creating unusual situation where foreign molecule becomes incorporated into body’s own cells unexpectedly.

Scientists describe it as xeno-autoantigen, against which immune system produces antibodies, resulting persistent immune activity called xenosialitis previously linked to cardiovascular disease.

Link To Diabetes Previously Unexamined

Resulting persistent immune activity xenosialitis previously linked to cardiovascular disease and cancer, researchers wanted to explore whether similar process contributes to diabetes. Question had not previously been examined in large prospective study, offering new avenue for understanding red meat and diabetes connection and prevention.

NutriNet-Santé Cohort Of 89953 Adults

Analysis drew on 89953 participants in NutriNet-Santé, long-term French study of diet, lifestyle, health, average age 42, 79 percent women. None had diabetes or cancer at enrollment, during median follow-up 7.2 years, 966 developed type 2 diabetes, providing prospective data for analysis.

Participants completed three 24-hour dietary records, researchers used validated database of measured Neu5Gc concentrations in foods to estimate consumption from meat or dairy.

Meat And Dairy Analyzed Separately

Meat analysis included beef, lamb, pork, rabbit, goat, game, processed meat products recorded as separate food group, dairy analyzed separately for comparison.

Men and women each divided into five equally sized groups quintiles according to meat-derived Neu5Gc intake, comparing diabetes risk across groups using lowest as reference.

Higher Intake Linked To Higher Risk

Highest-intake group had 63 percent higher diabetes risk, while second-highest group had 41 percent higher risk combined, relative increases not absolute percentages.

Association remained after accounting for age, sex, physical activity, diet quality, smoking, underlying health conditions, appeared in both men and women consistently.

Groups differed substantially in meat consumption, highest-intake men ate median 97 grams red meat daily, women 73 grams, plus processed meat. Including processed meat brought amounts to 136 grams and 96 grams respectively, lowest-intake group totals just 21 grams men and 9 grams women.

Possible Threshold For Immune Response

Risk rose particularly sharply at higher Neu5Gc intakes, researchers suggested could reflect threshold at which accumulation provokes stronger immune response, but threshold not established. Fezeu said although we do not know exactly what levels trigger immune response, data suggest higher intakes associated with progressively higher risk of T2D.

Obesity Explains Only 13 Percent

Accounting for body mass index weakened association, but remained statistically significant, researchers estimated obesity explained approximately 13 percent of association and proposed inflammation mechanisms. Researchers proposed inflammation affecting insulin-producing cells and insulin-sensitive tissues might help explain rest, those mechanisms still require further investigation and direct testing. However, when researchers also adjusted for total red meat consumption, association weakened and no longer statistically significant, though continued pointing toward higher risk.

This result makes difficult to separate Neu5Gc possible contribution from other substances in meat, highlighting need for further research and antibody measurement.

Dairy Neu5Gc Shows No Association

Dairy-derived Neu5Gc showed no association with diabetes, researchers considered consistent with lower concentrations in cow milk compared with beef and lamb.

Across all food sources combined, highest Neu5Gc intake associated with 37 percent higher diabetes risk, largely driven by meat sources with highest concentrations.

Future Prevention Strategies

Together, findings suggest association between Neu5Gc and T2D may depend on dietary source, with meat-derived Neu5Gc showing stronger association than total dietary Neu5Gc.

Fezeu said there may be differences between sources, or other components of red meat may contribute, highlighting complexity of red meat and diabetes relationship.

Fezeu added given how common red meat in Western diets, strong association between meat-derived Neu5Gc and T2D risk is important finding requiring further exploration.

Future research should explore whether reducing exposure to meat-derived Neu5Gc, for example favoring poultry or plant-based proteins over beef and lamb, could help prevent T2D. Studies directly measuring anti-Neu5Gc antibodies in large cohorts would also help to directly test xenosialitis mechanism in humans more accurately and conclusively.

Q&A

Q: What is Neu5Gc sugar in red meat and why does human body recognize it as foreign?
A: Neu5Gc is meat-derived sugar most mammals produce, but ancient CMAH gene mutation left humans unable to make it, immune system produces antibodies forming xeno-autoantigen causing xenosialitis inflammation.

Q: How much higher was type 2 diabetes risk for highest meat-derived Neu5Gc intake in French NutriNet-Santé study?
A: Highest-intake group had 63 percent higher diabetes risk, second-highest 41 percent higher versus lowest-intake group, relative increases after adjusting for age, activity, diet quality, smoking.

Q: Does dairy-derived Neu5Gc also increase type 2 diabetes risk like meat-derived Neu5Gc?
A: No, dairy-derived Neu5Gc showed no association with diabetes, researchers considered consistent with lower concentrations in cow milk and smaller serving sizes versus beef and lamb.

FAQ

Q: How many participants were tracked in NutriNet-Santé study and how many developed type 2 diabetes?
A: Analysis drew on 89953 participants average age 42, 79 percent women, none had diabetes at enrollment, 966 developed type 2 diabetes during median 7.2 years follow-up.

Q: Can study prove reducing Neu5Gc intake from beef and lamb prevents type 2 diabetes?
A: No, preliminary observational findings cannot establish causation, results not yet validated, unmeasured lifestyle differences could influence, food records may misrepresent actual intake.

Q: Why did association weaken when adjusting for total red meat consumption in analysis?
A: When adjusting for total red meat, association weakened and no longer statistically significant, making difficult to separate Neu5Gc contribution from other substances like heme iron.

Q: What future research do scientists plan to test xenosialitis immune mechanism directly in humans?
A: Team plans investigate Neu5Gc alongside heme iron and measuring anti-Neu5Gc antibodies directly in large cohorts to test proposed immune mechanism more accurately.

Q: What foods have highest Neu5Gc content and what alternatives might help reduce exposure?
A: Beef and lamb have highest Neu5Gc content, researchers suggest favoring poultry or plant-based proteins over beef and lamb to potentially reduce exposure and prevent T2D.

 

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