Could the bacteria living inside your intestines reveal whether you will develop type 2 diabetes years from now? According to a major Swedish study, the answer may be yes.
Researchers from Chalmers University of Technology have found that certain gut bacteria and changes in metabolism appear long before diabetes is diagnosed. Their findings were published in Cell Reports Medicine.
Type 2 diabetes often develops slowly over many years. During this time, blood sugar levels gradually rise as the body becomes less responsive to insulin.
Because symptoms may not appear until the disease is well established, many people do not realize they have diabetes until complications have already begun. Finding warning signs earlier could give people the chance to prevent or delay the disease.
The researchers examined stool samples from 4,685 adults in Sweden as part of the HealthFerm research project. The team then tracked the participants for an average of five years. During follow-up, 383 people developed type 2 diabetes. By comparing their gut bacteria with those who stayed healthy, the scientists discovered several clear differences.
Nine bacterial species were linked to the future development of diabetes. One of the most unexpected discoveries involved Akkermansia muciniphila. Previous research often described this bacterium as beneficial, but this study found that high levels were linked to greater diabetes risk.
The researchers believe the explanation may depend on diet. When enough fiber is available, the bacterium feeds on that fiber. If fiber intake is too low, it may begin consuming the protective mucus layer inside the gut. This may increase inflammation and interfere with the body’s ability to control blood sugar.
The study also identified Coprococcus catus as another important bacterium. People with only very small amounts of this bacterium appeared to have a higher diabetes risk, while those with larger amounts did not show the same pattern. These findings suggest that maintaining a healthy balance of gut bacteria may be important for long-term metabolic health.
The researchers say gut bacteria could eventually become useful biomarkers. Instead of relying only on blood tests, weight, or family history, doctors might one day include a stool sample when estimating a person’s diabetes risk.
Because gut bacteria can be changed through healthier eating habits, probiotics, or other future treatments, they may also become targets for personalized prevention.
The scientists caution that these findings must still be confirmed in larger studies involving different populations. At present, they cannot recommend specific diets based on an individual’s gut bacteria.
However, the results strengthen current advice to eat more fiber-rich foods such as vegetables, fruit, legumes, and whole grains because these foods support a healthier gut microbiome.
The study stands out because it followed participants before diabetes appeared, making it possible to identify early biological changes. Although the research shows a strong association, it does not yet prove that these bacteria directly cause diabetes.
Even so, the findings offer an exciting direction for future research. If confirmed, gut bacteria testing could become an important tool for early diagnosis and personalized prevention of one of the world’s most common chronic diseases.
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Source: Chalmers University of Technology.
