A new study confirms a link between body fat and reduced brain volume. An international study of 10-thousand people shows diet and lifestyle may affect how you think. The research shows that the more belly fat you have, the less brain volume. That creates a higher risk for dementia. Researchers at Providence St. John's Health Center in Santa Monica, California say overactive and inflamed fat cells send signals to the brain to downsize. To keep belly fat to a minimum, make sure the foods you choose are nourishing your brain, as well as your body.