Kerry Katona has “issues with food”. The former Atomic Kitten singer is determined to get herself back on track with her diet and fitness because, after overindulging over the Christmas period, she’s fallen into a cycle of comfort eating and her resulting weight gain has left her feeling self-conscious in front of her fiance Ryan Mahoney. She wrote in her column for new! magazine: “I’ve relaunched my fitness brand M-Fit, which is really exciting. We’ve set up a new platform for weekly classes. I’m not feeling my best at the moment, so I’m looking forward to getting back into training. “I’ve ga…