Why Weight Loss Isn’t Enough for Everyone at Risk of Diabetes

Losing weight is often recommended as a key step in preventing type 2 diabetes, but new research published in Diabetes suggests the story may be more complex. In this long-term study, researchers found that some people, particularly those with certain metabolic risk profiles, may still develop diabetes despite meaningful and sustained weight loss. The findings highlight that while lifestyle changes are important, they don’t work the same way for everyone.

“We were particularly interested in whether individuals in risk clusters 3 and 5 differed from those in other clusters with regard to improvements in blood glucose levels and the prevention of type 2 diabetes,” explained study investigator Norbert Stefan, M.D., Ph.D., of the Department of Diabetology, Endocrinology and Nephrology at the University Hospital of Tübingen in Germany, and the German Center for Diabetes Research (DZD).

Different Risk Profiles, Different Outcomes

Investigators previously grouped individuals into six “risk clusters” based on how their bodies process insulin and regulate blood sugar. Two of these groups were considered especially high risk: one involving people with impaired insulin-producing cells (cluster 3), and another involving individuals with higher body weight, older age and severe insulin resistance (cluster 5).

To better understand how these groups respond to lifestyle changes, participants completed a two-year intervention focused on diet, exercise and weight loss. They were then followed for nearly nine years to see how their metabolic health evolved over time.

What Happened Over Time

Even among participants who successfully lost weight, averaging about 8% body weight reduction, the outcomes varied widely. Those in the highest-risk group (cluster 5) experienced worsening blood sugar levels and a decline in insulin production over time. Most notably, 41% of individuals in this group went on to develop type 2 diabetes, despite maintaining weight loss.

In contrast, people in lower-risk groups did not develop diabetes, and only a small number of those in the beta cell–related group (cluster 3) progressed to the condition. This suggests that underlying metabolic differences can strongly influence how the body responds to lifestyle interventions.

“We were very surprised to find that, despite a large and sustained weight loss of 8% and after a very long follow-up period of nine years, individuals in risk cluster 5 showed increasing blood glucose levels, declining insulin secretion and a persistently high risk of type 2 diabetes,” noted Stefan.

Beyond Lifestyle Alone

These findings point to an important reality: weight loss, while beneficial, may not fully address the biological drivers of diabetes in everyone. For individuals with severe insulin resistance, the body may continue to struggle with blood sugar regulation even after significant lifestyle improvements.

This means some patients may benefit from a more tailored approach that goes beyond diet and exercise. That could include closer monitoring, earlier use of medications or other targeted interventions designed to address specific metabolic challenges.

A More Personalized Path Forward

The study underscores the growing importance of personalized medicine in preventing chronic conditions like type 2 diabetes. Rather than relying on a one-size-fits-all strategy, health care providers may need to consider individual risk profiles when recommending prevention plans.

For patients, this reinforces the value of ongoing conversations with their care team. Understanding your unique risk and how your body responds to lifestyle changes can help guide more effective, individualized strategies to protect long-term health.