Meghan Trainor says her path to losing weight started after she was diagnosed with gestational diabetes during her pregnancy.

Trainor — who has spoken before about losing 60 pounds — says the diagnosis pushed her to become “hyper-focused” on her health.

Meghan Trainor says her focus on health — and eventually her weight loss — truly began after she was diagnosed with gestational diabetes during pregnancy, a moment she says made her “fixated” on getting healthier.

During an interview on KIIS FM on Thursday, Nov. 20, the 31-year-old singer addressed the questions she often gets about her slimmer appearance. “People keep asking, ‘Why are you so thin now?’ or reminding me, ‘You were the All About That Bass girl,’ ” she said. “I’m like, I was 19 when that song came out.”

Trainor explained that the public chatter doesn’t always reflect the reality of her journey. “I’ve been working on my fitness ever since I got healthy again,” she said. “It really started when I was pregnant and found out I had gestational diabetes. That’s when I realized I needed to actually learn about health and fitness.”

She added that her motivation grew even stronger once she became a mom and started thinking about her long-term career.

“If I want to keep touring, I need to be at my strongest,” she said. “And if I want to lift my kids out of their crib without throwing out my back, I have to take care of my body.”

The Grammy winner said she now strength trains three times a week and prioritizes overall wellness. “I’m focused on my health,” she noted. “I’m obsessed with making sure my hormones and gut are in a good place. I just want to feel good, because this job is tough when you don’t.”

Despite her progress, Trainor said the backlash about her slimmer figure has been surprising. “I got a lot of hate for losing weight,” she admitted. “It really threw me off and left me confused.”

In March, Trainor drew criticism over her weight loss and later explained in an Instagram post that she had chosen to use Mounjaro, the brand name for the GLP-1 drug tirzepatide.

Later that same month, while attending Billboard’s 2025 Women in Music Awards, she said she started the medication after giving birth to her second son, Barry, whom she shares with her husband, actor Daryl Sabara. (They also have an older son, Riley.) She noted that alongside the medication, she has been working with a dietitian, adopting healthier habits and training with a fitness coach.