I agree that the title is a little sensationalistic... I haven't read the actual study, but I trust them that there is an association between the two. However, we all know that correlation does not equal causation, and I have a feeling that there are some factors that have yet to be accounted for. This is just wild speculation here, but we know that people that are overweight are usually more sedentary, which means a slower metabolism. We do know that a slower metabolism can lead to the buildup of amyloid plaques in the brain, which could be why it appears that stomach fat is causing dementia...