A longevity expert has debunked a widespread myth surrounding an unexpected everyday food item . Dan Buettner , 65, has spent years examining the lifestyle patterns of centenarian residents of 'Blue Zones' in an effort to help people live longer. On social media, he's previously acknowledged that , while countless myths circulate, one particular food group unfairly gets a bad name, with the full picture often overlooked. Perhaps surprisingly, this food is carbohydrates - or carbs - which Dan