Stephanie Buttermore Obituary, Death: Fitness Influencer and Cancer Researcher Stephanie Buttermore Has Died Suddenly at 36 — Cause of Death Unknown
Stephanie Buttermore, the beloved fitness influencer, body positivity advocate, and ovarian cancer researcher who inspired millions of followers across YouTube and Instagram, has died suddenly at the age of 36. Buttermore passed away on March 6, 2026, just nine days after celebrating her 36th birthday on February 25. The devastating news was confirmed the following day by her fiancé, Canadian bodybuilder and fellow fitness YouTuber Jeff Nippard, through a heartbreaking statement posted to his Instagram and YouTube accounts. No cause of death has been disclosed. Nippard’s team described her passing as “sudden” and asked the public to respect the family’s privacy during an unimaginable time of grief.
The announcement from Nippard’s team read: “It is with profound sorrow that we share the sudden passing of Jeff’s fiancée and partner of 10 years, Stephanie. 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. We kindly ask for privacy as we navigate this tragic loss.” The post sent shockwaves through the global fitness community, with millions of fans, fellow influencers, and scientists left stunned by the loss of a woman who had shaped so many lives through her honesty, vulnerability, and scientific expertise.
Stephanie Buttermore was born on February 25, 1990, and built one of the most respected and authentic platforms in the fitness and health space. She earned a Bachelor of Science in Micro and Molecular Biology from the University of Central Florida before completing her PhD in Pathology and Cell Biology at the University of South Florida, where her research focused on the molecular mechanisms driving ovarian cancer progression. Among her most significant scientific contributions was the discovery of a protein called RHAMM as a potential early detection urinary screening marker for ovarian cancer — research that carries real-world implications for women’s health. In 2017, she transitioned into full-time content creation, quickly amassing over one million YouTube subscribers and more than 528,000 Instagram followers by combining her scientific expertise with deeply personal storytelling.
Buttermore became a defining voice in the body positivity movement through her “All In” journey — a bold and transparent public decision to abandon restrictive dieting and allow her body to reach its natural set point weight. She documented the process with radical honesty, eating upward of 10,000 calories per day and sharing every physical and emotional challenge with her audience. The journey resonated with millions of women who had struggled with disordered eating, and cemented Buttermore’s legacy as someone who used her platform to do meaningful good. She also spoke openly about her mental health battles, including severe anxiety that at one point left her unable to leave her house, and her eventual journey to wellbeing after stepping away from social media in 2024.
Her final public words were posted on Valentine’s Day 2026, when she commented on Nippard’s photo of the two of them: “Love you forever.” The two had been together for ten years, with Nippard proposing just months before her death. “6 years ago I slid in Stephanie’s DMs and we immediately formed a friendship,” Nippard wrote when announcing their engagement. “Our first date was a shoulder workout and I will never forget it. We got along like best friends right away because we established a foundation of shared interests and values from the beginning.” The couple had been planning their wedding at the time of her death.
The fitness and scientific communities have been united in grief since the announcement. Fellow influencer Buff Bunny wrote: “Heaven gained an amazing angel. Someone who cared so deeply for others.” Thousands more flooded tribute pages to share how Buttermore had personally helped them through their own struggles with food, body image, and self-worth. The cause of Stephanie Buttermore’s death has not been officially confirmed and is expected to remain private per the family’s wishes. This post will be updated if any official information is released.
Our deepest condolences go out to Jeff Nippard, the Buttermore family, and the millions of lives Stephanie touched through her extraordinary work. She was 36 years old.