Mariah Carey shared her secret on how she lost 40 lbs. The pop icon says she completely removed processed food and non-natural sugar from her diet and is eating more vegetables and lean meats. According to a source close to the singer, “Mariah’s also being really strict about portion control. She’s eating a lot slower, and she’s mindful of when she’s feeling full and when to stop eating.” She also tries to fit in a daily session of swimming and water aerobics.