Fitness Community in Mourning Following the "Sudden" Passing of Influencer Stephanie Buttermore, PhD

Fitness community in mourning after the sudden death of Stephanie Buttermore, PhD, at age 36. Fiancé Jeff Nippard shares heartbreaking tribute weeks after Valentine's Day.

By: AXL Media

Published: Mar 9, 2026, 12:43 PM EDT

Source: People

A Legacy of Science and Strength

Stephanie Buttermore was far more than a lifestyle influencer; she was a bridge between rigorous academic research and the fitness world. With over 500,000 followers on Instagram and a massive YouTube presence, she utilized her PhD background to dismantle "diet culture" and provide scientific clarity on metabolic health. Her famous "All-In" journey, where she intentionally gained weight to repair her relationship with food and hunger hormones, became a landmark movement for thousands struggling with disordered eating. Nippard’s tribute emphasized her warmth, her love for family, and her dedication to ovarian cancer research at the University of South Florida.

The Recent Hiatus and Mental Health Journey

In May 2024, Buttermore surprised her audience by announcing an indefinite hiatus from social media. At the time, she shared that the break was essential for her well-being, stating that stepping away from the digital spotlight had allowed her to "no longer struggle with anxiety." This candidness about the pressures of being a public figure resonated deeply within the creator economy. While she had remained largely private since that announcement, her Valentine’s Day appearance on Nippard’s feed—captioned with references to "lowering cortisol levels"—suggested a peaceful and happy period in her personal life prior to the tragedy.

Statistical Context: Ovarian Cancer and Health Research

While Buttermore’s cause of death has not been disclosed, her professional life was dedicated to the fight against ovarian cancer. Statistics highlight why her research was so vital: