Can diet and exercise prevent more than just diabetes?
Yes. In a 21-year study of adults with prediabetes, those who followed a structured lifestyle program had about a 21% lower risk of developing two or more chronic diseases compared with a placebo group. Metformin, a common diabetes drug, did not show the same benefit.
This research followed 1,173 adults who started out with prediabetes, meaning their blood sugar was higher than normal but not yet in the diabetes range. They were part of the Diabetes Prevention Program and its long-term follow-up study, one of the most carefully tracked groups in this field. The big question was simple. If you help someone change their habits early, do the benefits reach beyond blood sugar to the rest of their health?
What the data show
The answer points strongly toward lifestyle. People assigned to the lifestyle program were asked to eat healthier, get at least 150 minutes of physical activity each week, and aim to lose 7% of their body weight. Over the next two decades, this group was roughly 21% less likely to develop multimorbidity, which is the medical term for having two or more chronic conditions at the same time, such as heart disease, high blood pressure, or arthritis.
Metformin told a different story. While the drug is well known for helping prevent or delay diabetes, it did not significantly lower the risk of these stacked-up chronic conditions when compared with placebo. The lifestyle effect stood on its own, suggesting that the everyday work of moving more and eating better protects the body in ways a single pill may not.
Dr. Kumar’s Take
I find this study quietly powerful. We often frame prediabetes as a narrow blood sugar problem, but this tells me that the choices people make in those early years ripple out for decades. A 21% drop in the risk of multiple chronic diseases over 21 years is a meaningful number, and it came from changes most people can actually make. I want to be careful here. This does not mean metformin is useless, because it still has a clear role in preventing diabetes itself. What it does mean is that lifestyle work earns its place as a frontline tool, not a backup plan. When a patient asks me where to start, results like these make my answer easy.
How the study was done
This was not a quick snapshot. Researchers first randomly assigned participants to one of three groups, lifestyle, metformin, or placebo, and then followed them for 21 years. That random assignment matters, because it helps make sure the groups were similar at the start, so any later difference is more likely to come from the treatment itself. The very long follow-up is the real strength here. Many studies end after a year or two, but chronic diseases build slowly, so watching people for two decades gives a much truer picture of what these early choices actually do over a lifetime.
Who this matters for most
If you have been told you have prediabetes, this research speaks directly to you. The lifestyle goals used in the study were specific but realistic, and they are the same targets I discuss with patients every week. The findings suggest the payoff is not only avoiding diabetes but also lowering your odds of carrying several health conditions later in life. That is a future worth working toward, and the earlier you start, the more time the benefits have to add up.
Practical Takeaways
- Aim for at least 150 minutes of activity each week, which breaks down to about 30 minutes on most days, since this was a core part of the program that worked.
- Set a modest weight goal of around 7% of your current weight rather than chasing a dramatic number, because that smaller target is what the study tested and it still delivered long-term protection.
- Treat healthier eating as a daily habit, not a short diet, since the benefits in this study came from years of consistency rather than quick fixes.
- Talk with your doctor about whether metformin fits your situation, keeping in mind it helps with diabetes prevention even though it did not lower broader chronic disease risk here.
Related Studies and Research
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- Real-world brexanolone outcomes: 12-month follow-up shows sustained benefits
FAQs
What is multimorbidity, and why is it a bigger deal than one disease?
Multimorbidity simply means living with two or more long-term health conditions at once, like having both diabetes and heart disease. It matters because these conditions tend to feed off each other, making each one harder to manage and treatment more complicated. Juggling several diseases also means more medications, more appointments, and a heavier daily burden. Lowering the chance of reaching that point is a major win for both quality of life and independence as you age.
Why didn’t metformin lower the risk of multiple chronic diseases?
This study did not pin down the exact reason, so I want to avoid guessing beyond the data. What we can say is that metformin mainly targets blood sugar, while a lifestyle program touches many systems at once through weight, fitness, and diet. That broader reach may be why it protected against a wider range of conditions. Metformin still has real value for preventing diabetes, but this research suggests its benefits may not stretch as far across the body.
Is it too late to start if I already have prediabetes?
Not at all, and that is the encouraging part of this research. The participants began the program while they had prediabetes, not before it, and they still saw lower long-term risk. This tells me the window for meaningful change is open even after a prediabetes diagnosis. The key is starting soon and staying consistent, since the protective effects in this study built up gradually over many years.
Bottom Line
This 21-year study delivers a clear message. For adults with prediabetes, a structured program of healthier eating, regular activity, and modest weight loss cut the risk of developing multiple chronic diseases by about 21%, while metformin did not show the same broad protection. The benefits of changing your habits early reach far beyond blood sugar, shaping your health for decades to come.
