Dementia more common among lightweights

Being middle-aged and underweight is not a good combination when it comes to dementia risk, according to evidence from the UK.

The study of two million people over a 20-year period shows that compared with normal-weight people, those with a low BMI in midlife are a third more likely to get dementia.

The results also indicate that obesity in middle-age is protective against dementia, a surprising finding that contradicts previous