A new study published in Human Brain Mapping reports that elderly individuals who were obese or overweight had significantly less brain tissue than individuals of normal weight.

The study reviewed the brain images of 94 people in their 70s. They were followed for five years, and it was discovered that clinically obese people had 8% less brain tissue, while simply overweight people had 4% less brain tissue compared to normal-weight humans.

“The brains of obese people looked 16 years older than their healthy counterparts, while those of overweight people looked 8 years older,” study leader Paul Thompson said. “This is the first study to show physical evidence in the brain that connects overweight and obesity and cognitive decline.”