Gareth Malone: "I"ve got a fast metabolism so I need to eat a lot and often"

'I've got a fast metabolism so I need to eat a lot and often': Under the microscope with Gareth Malone | UPDATED: 01:09 GMT, 4 December 2012 The Choir star, 36, on pumping iron, what makes people attractive, his biggest food weakness and how he avoids a hangover 'I follow a low-GI diet which regulates your body sugar and energy levels,' said Gareth Malone HOW DO YOU KEEP THOSE LUNGS SO HEALTHY I kid you not, but I love going to the gym and pumping iron.