Study finds link between obesity and vascular dementia Fox News senior medical analyst Dr. Marc Siegel joins 'America's Newsroom' to discuss an increase of colon cancer in people under 50 despite overall lowering cancer deaths and a new study linking obesity to vascular dementia. NEW You can now listen to Fox News articles! Excess salt intake has long been linked to higher blood pressure , but now a new study has also tied it to quicker cognitive decline in certain groups. In a six-year study