Middle-age adults with excess belly fat now have yet another reason to reduce their waist circumference. Research shows that abdominal obesity nearly triples their risk for dementia. Belly fat is already a known risk factor for diabetes, stroke, hypertension, hyperlipidemia (elevation of lipids such as cholesterol), and heart disease.

Obese people, who have a Body Mass Index (BMI) of 30 or higher, are at increased risk for mental health disorders. Depression and anxiety often lead to an increase risk of obesity, and obesity is common in people with depression. However, even people with normal BMIs who have large abdomens are much more likely to develop dementia.

Abdominal obesity is associated with lower total brain volume in otherwise healthy, middle-age adults, and a smaller brain is associated with a higher risk for subsequently developing dementia. In a study published in May 2010, researchers determined that visceral fat-the fat surrounding our organs-is linked to smaller brain size, more so than subcutaneous fat (fat that lies under our skin).