Mary Killen has opened up on her sobriety, explaining that she quit alcohol three years ago as a result of a terrible bout of food poisoning.The Gogglebox star, who recently left fans baffled after revealing why she and Giles call each other "nutty", explained that she suffered from a bacterial infection called campylobacteriosis – which can cause diarrhoea, cramps, fever and pain.The star said she thought she may have gotten the infection from eating "grubby" vegetables as it left her vomiting