Meghan Trainor is opening up about her recent weight loss - and what led her to make the change. While speaking to iHeartRadio's Kayla Thomas last week, the All About That Bass singer is opening up like never before about her weight loss journey. When asked about it, Meghan reminded everyone how young she was when she debuted - and how many things have changed since then: "I'm getting a lot of hate online just posting who I am, and everyone's like 'Why are you thin now? You were 'All About That Bass' girl.