After overhauling her lifestyle and losing three stone, Davinia Taylor has said her weight loss is down to biohacking.The former Hollyoaks actress, who appeared on Friday's episode of This Morning to promote her new book, also claimed that vegetable oil causes depression. Speaking to hosts Alison Hammond and Dermot O'Leary, the 43 year old explained: "You don't count calories, you've gotta count chemicals.