Look AHEAD — Cardiovascular effects of intensive lifestyle intervention in type 2 diabetes
In plain English
The largest randomised trial of lifestyle-led weight loss in type 2 diabetes: 5,145 overweight adults were assigned to an intensive programme (calorie restriction plus exercise, achieving ~8.6% weight loss in the first year) or to standard diabetes support and education, then followed for nearly a decade. The intensive group kept off more weight and improved fitness and risk factors — but, against expectation, had no fewer heart attacks, strokes or cardiovascular deaths, and the trial was stopped early for futility. It is the pivotal cautionary tale that sustained weight loss does not automatically translate into fewer hard cardiovascular events.
Why it matters
Intensive lifestyle weight loss improved fitness and risk factors but did not cut cardiovascular events in type 2 diabetes.
Informs: Weight Loss·Diabetes·Heart Disease
Provenance
- Design
- Randomised controlled trial
- Sample size (n)
- 5,145
- Follow-up
- 9.6 years
- Peer-reviewed
- Yes
- Replications
- 2
- Funding
- Public / academic
- Funders
- US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- Institutions
- Wake Forest School of Medicine (coordinating centre), Brown University, US National Institutes of Health
decades.plus score
A transparent 0–100 weighted sum across six components. Higher scores reflect bigger, cleaner, more replicated work.
Caveats
The control group also improved over time (background diabetes care advanced during the trial), narrowing the gap the study could detect. Pre-specified subgroup analyses suggested those who lost the most weight may still have benefited — the null is for the average effect, not necessarily for everyone.
