A STAGGERING 6.8 million burgers are eaten every day in the UK but weighing in at up to 900 calories, they’re hardly a dieter’s best friend…until now. Fast food chain Five Guys have launched a diet-friendly burger so fast-food connoisseur turned slimmer Vivienne Joy, 53, from Retford in Nottinghamshire, who has shed 5st on Mounjaro…