- A large US study found that long-term exposure to excess weight was a stronger predictor of cardiovascular disease than BMI measured at a single point in time.
- The effect was strongest in younger adults, suggesting earlier weight patterns may matter more than many people realise.
- The findings support the idea that reducing excess weight over time may lower risk, rather than treating one BMI reading as a fixed verdict.
Researchers from Mass General Brigham studied more than 136,000 adults from two long-running cohort studies.
All participants had a BMI above 25 at baseline.
To estimate long-term exposure to excess weight, the researchers averaged BMI measurements over a ten-year period.
They then followed participants for cardiovascular outcomes for an average of 16.7 years.
During follow-up, more than 12,000 people experienced events such as heart attack or stroke.
The study found that cumulative exposure to excess weight was more strongly linked to cardiovascular risk than a single BMI reading.
That is an important distinction.
A one-off BMI gives a snapshot. Long-term exposure tells you more about the actual burden placed on the body over time.
The strongest effects were seen in younger groups.
For example, women younger than 35 at baseline had a 60% higher cardiovascular risk with high cumulative exposure to excess weight.
The increase was smaller in older groups and was not seen in women over 50 or men over 65.
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That may reflect the fact that excess weight earlier in adult life has longer to do harm.
It also reinforces a practical message.
Risk is not set in stone by one reading.
Weight history matters and reducing excess weight exposure over time may still improve outcomes.
That makes this a more useful and more humane way of thinking about risk than treating BMI as a permanent label.
