Obesity in over-50s ‘associated with greater risk of dementia’

People in their 50s who are obese have a 31% increased risk of dementia later in life compared with those of the same age with normal weight, a new study suggests.

Scientists from University College London (UCL), who conducted the research, say this risk may be particularly high for women who have abdominal obesity.

The researchers said the findings, published in the International Journal of Epidemiology, suggest keeping body mass index (BMI) under control could play a “significant role” in reducing the risk of dementia.

Dr Dorina Cadar, from UCL’S Institute of Epidemiology and Health Care, and senior author on the study, said: “These findings provide new evidence that obesity may have important implications in terms of dementia risk.”

The research team analysed data gathered from more than 6,500 people who were part of the English Longitudinal Study of Ageing, a representative database of over-50s in England which stores information about health, wellbeing and economic circumstances in several time periods.

The participants did not have dementia at the start of the study.

Compared with those with BMIS at normal levels (between 18.5-24.9), the team found people whose BMI was 30 or higher at the start of the study period had a 31% greater risk of dementia, at an average of 11 years later.

Women with abdominal obesity, based on waist circumference, were found to have a 39% increased risk of dementia compared with those who were not obese.