AJ McLean feels “so much better” mentally since losing weight. The Backstreet Boys star, 44, managed to lose a total 27lbs after embarking on a health kick earlier this year and admitted that the lifestyle change has improved his mental health. He said: “I was doing a TV show in South Africa this past February. So between February and now, I’ve lost 27 lbs. And once you get into a routine, and you start to see results and you start to feel better, you sleep better, your mental state of mind is so much better, your focus is better. You just want to keep that up. You don’t want to go backwards.”…