The fitness community is mourning the sudden loss of Stephanie Buttermore, a popular YouTube personality and cancer research scientist. Buttermore, 36, passed away unexpectedly, leaving behind her fiancé, Jeff Nippard, and a dedicated following of over 1 million subscribers. The news was announced Friday, March 6, by Nippard’s team via social media, prompting an outpouring of grief and support from fans and fellow influencers.
Buttermore was known for her engaging content focused on nutrition, exercise, and body positivity. She often shared personal experiences, including her struggles with eating disorders and mental health, creating a space for open conversation and vulnerability within the fitness space. Her “All In” challenge, where she consumed over 10,000 calories daily to promote healthy weight gain and body acceptance in women, garnered significant attention and solidified her commitment to challenging conventional fitness standards.
“It is with profound sorrow that we share the sudden passing of Jeff’s fiancée and partner of ten years, Stephanie,” read a statement posted on Instagram. “As many of you know, Stephanie meant the world to Jeff. She will be remembered for her warmth and compassion, her love for her family, and her PhD research on ovarian cancer.” The statement requested privacy for Nippard and his family as they navigate this difficult time. Fox News first reported the news.
Nippard, a former professional bodybuilder and powerlifter, and Buttermore had been together for a decade and announced their engagement in 2022. According to Nippard, their relationship began after he sent her a message on Instagram. He recounted in a post that they spent nearly a month speaking on Skype for 3-4 hours each day before he traveled to Florida from Canada to meet her. “Our first date was to work shoulders and I’ll never forget it,” he wrote.
Beyond her social media presence, Buttermore was a dedicated researcher, holding a PhD in pathology and cell biology with a focus on the molecular mechanisms driving ovarian cancer progression. People Magazine reported that she dedicated her career to ovarian cancer research.
In May 2024, Buttermore announced she was taking a step back from Instagram, citing improvements in her mental health. “I no longer struggle with anxiety. At all,” she shared in a post. “It was almost crippling a few years ago to the point I felt I couldn’t breathe or leave my house. Now I really don’t have to care whether people liked what I posted or if they are saying negative things about me.” The Independent highlighted this post as a reflection of her journey towards prioritizing her well-being.
As of Monday, March 9, 2026, the cause of Buttermore’s death remains undisclosed, and Nippard’s team has requested continued privacy. US Magazine confirmed the request for privacy from Nippard and Buttermore’s family.
The fitness influencer’s passing has prompted an outpouring of support and remembrance from the online community. Fellow influencer Buff Bunny posted on Nippard’s Valentine’s Day post, “Heaven gained an amazing angel. Someone who cared so deeply for others. Praying for you Jeff and her family.”
The legacy of Stephanie Buttermore extends beyond her fitness expertise. She will be remembered for her advocacy for body positivity, her openness about mental health struggles, and her dedication to scientific research. The impact of her work and her message of self-acceptance will undoubtedly continue to inspire her followers for years to come.
As the fitness community mourns this loss, attention now turns to supporting Jeff Nippard and Buttermore’s family during this incredibly difficult time. Further details regarding memorial arrangements or a potential foundation in Buttermore’s name are currently unavailable.
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