Starting cholesterol-lowering statins soon after a type 2 diabetes diagnosis may do more than protect the heart—it might also protect the brain. In a nationwide study of over 132,000 people in Denmark, those who began statin treatment within a year of their diabetes diagnosis had a 15% lower relative risk of developing dementia over the next decade compared with those who never started statins.
The Research
Presented at ESC Congress 2026 and published in The Lancet Regional Health - Europe, the study was led by Dr. Tummas Ternhamar from Copenhagen University Hospital, Denmark. Using Danish national registers, researchers identified 132,585 people who developed type 2 diabetes between 2006 and 2019 and had not previously taken statins. Participants were followed until the end of 2021, and medical records were checked for new diagnoses of all-cause dementia.
To reduce bias that often plagues observational studies, the team used a clone-censor-weight design, mimicking a randomized trial. They compared three groups: those who did not start statins within five years of diagnosis, those who started within the first year, and those who started between one and five years after diagnosis. During a median follow-up of 7.1 years, 2.7% of participants developed dementia. Early statin users had a 15% lower relative risk of dementia compared to non-users, while later starters had a 10% lower relative risk. The results were similar for both men and women.
"In individuals developing type 2 diabetes, statins were associated with a lower risk of dementia, most pronounced in those with early initiation," said Dr. Ternhamar. "Statins seem to be underused in patients with type 2 diabetes, despite their protective effects against cardiovascular disease. Our findings suggest another potentially important reason to ensure that patients with type 2 diabetes and high LDL-C receive timely statin treatment."
Why It Matters
Dementia is a growing global concern, and nearly half of cases might be prevented by addressing modifiable risk factors, including high LDL cholesterol from midlife. People with type 2 diabetes are already at heightened risk for cognitive decline, making this finding particularly relevant. While statins are known to cut heart attack and stroke risk, this study suggests an added brain benefit—especially when started promptly after a diabetes diagnosis. Commenting on the research, Professor Isabel Goncalves, a member of the ESC Communication Committee, noted: "Because statins are widely available and inexpensive, the findings are potentially important."
However, because this is an observational study, it cannot prove statins directly prevent dementia. The authors themselves caution that further research is needed to confirm causality.
What You Can Do
If you or a loved one has type 2 diabetes or high LDL cholesterol, talk to your doctor about whether statins are right for you—and why starting them early might be beneficial. While medical decisions should always be made with a healthcare provider, this study adds another reason to take cholesterol management seriously. Alongside medical care, keeping your brain active through challenging activities—like puzzles, learning new skills, and taking cognitive tests—may help support long-term brain health.
Source: ScienceDaily Mind & Brain
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