Meghan Trainor says she was left “heartbroken” after a wave of online criticism targeted her dramatic weight loss, admitting the backlash was far more personal and vicious than anything she had experienced before.

The 30-year-old singer, best known for her breakout hit “All About That Bass”, has openly discussed shedding more than 60lbs in recent years. She says the change came through a mix of consistent exercise, dietary adjustments and low-dose use of Mounjaro, the injectable weight-loss medication that has surged in popularity across the US and Europe. While Trainor has insisted her goal was to improve her physical and mental health after giving birth to her second child, the transformation has become a lightning rod for online commentary — much of it negative.

Speaking on The Jennifer Hudson Show, she said the criticism blindsided her and cut far deeper than she expected. “It felt like a flame lit off, and I was just getting attacked by so many mean comments,” she explained during the interview. Although she’s no stranger to public attention, she admitted she’s usually able to brush off trolling. “Usually, I don't get a lot of mean comments, or I don't look at them and they don't faze me. But these ones were so aggressive. They're like, ‘You were the bass girl, why’re you thin now?’”

For Trainor, the reaction wasn’t just contradictory — it was emotionally damaging. “It was very confusing, and it broke my heart,” she added, describing the experience as a shock given how her career has always been rooted in body positivity. Her 2014 debut centred around celebrating fuller figures and rejecting unrealistic beauty standards, something that made her instantly relatable to millions of young fans.

But in recent years, weight-loss drugs such as Mounjaro and Ozempic have become unavoidable cultural flashpoints, particularly as more public figures acknowledge using them. Critics argue the rise of rapid-loss medications risks reinforcing the idea that thinness equals success, while others fear it undermines years of progress in the body-positivity movement. For many artists who were once praised for championing self-acceptance, the scrutiny can be even harsher.

Trainor’s experience reflects the stark reality of that shift. Online, she has faced accusations of “selling out”, hypocrisy, and even betrayal — comments she says disregard the health struggles she faced after pregnancy. The singer has been candid about dealing with post-partum depression, low energy, and a desire to feel strong rather than simply lighter. Those details, she noted, are often lost in the noise of social media.

Her use of Mounjaro, a medication originally designed for type-2 diabetes, has also drawn controversy. Its repurposing for weight loss has become widely debated, not only because of its medical implications but because celebrities who use it often become targets for moral judgement. Trainor’s remarks highlight how deeply personal these conversations can become, especially for women in the public eye.

Despite the backlash, the singer also stressed that she now feels physically healthier and more confident than she has in years. She continues to promote a balanced approach to wellbeing, urging fans not to compare themselves to others — including her. She has said previously that her priority is raising her children and managing her demanding career, not achieving one specific body type.