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Surprise findings in study of how weight affects dementia

Being overweight cuts the risk of dementia, according to the largest and most precise investigation into the relationship.

The researchers admit they were surprised by the findings, which run contrary to current health advice.

The analysis of nearly two million British people, in the Lancet Diabetes & Endocrinology, showed underweight people had the highest risk.

Dementia charities still advised not smoking, exercise and a balanced diet.

Read more on the BBC News website