Stephanie Buttermore (born January 26, 1990; died March 6, 2026) was a Canadian-American fitness YouTuber, scientist, and influencer holding a PhD in pathology. She amassed over 1 million subscribers with evidence-based videos on nutrition, body image, and exercise.
Before Fame
She started her channel around 2018, blending her research in ovarian cancer with vlogs about eating disorder recovery and “All In” challenges. Her “Fantasy Cheat Days” series showcased her engaging, science-driven approach to fitness.
Trivia
A frequent collaborator with fiancé Jeff Nippard, she openly discussed mental health alongside gym tips, sparking debates in online fitness communities.
Family Life
Engaged to Jeff Nippard for a decade, she often thanked him and her family for fueling her career and personal journeys.
Death
Stephanie died suddenly at 36. Jeff Nippard shared the news on Instagram on March 6, 2026, asking for privacy during their mourning. No cause was publicly shared.