Stephanie Buttermore, the fitness YouTuber and partner of fellow influencer Jeff Nippard, shocked fans when she quit social media in 2024, two years before her sudden passing at 36. Known for her transparency and scientific approach to fitness, Buttermore had built a loyal following with over a million subscribers.
X| @stephanie_bu316| Buttermore quit YouTube due to mental health pressures Buttermore rose to fame after sharing her journey through bikini bodybuilding competitions and fitness education, all while completing a Ph.D. in pathology and cell biology, focusing on ovarian cancer. She launched her YouTube channel in 2014, blending research-backed advice with candid reflections on workouts, diet, and mental health. Her honest approach drew attention not only from viewers but also from Jeff Nippard, who would become her partner in 2016.
The all-in challenge and public scrutiny
Her most ambitious experiment, the "All-In Challenge" in 2019, involved a complete reversal of her previous restrictive diet. Following advice from Hypothalamic Amenorrhea specialist Dr Nicola Rinaldi, Buttermore began eating to satiety to restore normal hormonal function, gaining more than 40 pounds over a year. While she later described the challenge as a personal success, it subjected her to relentless online criticism, exacerbated by comments from her mother and her own insecurities.
X| @stephanie_bu316| Stephanie Buttermores sudden departure from social media "This journey was terrifying because of the public scrutiny," she admitted, reflecting on how each pound gained felt magnified under the lens of social media. Coping strategies like reading and solving Rubik's Cubes became essential to her mental wellbeing. Nippard noted her transformation, observing how her happiness and their relationship had improved significantly during the experiment.
Even after the challenge ended, Buttermore continued to face harsh responses, particularly following a 2023 video revealing her breast augmentation. She reflected on the criticism in a 2024 Instagram post: "I used to be so bitter and genuinely hurt by the hate, but I've come to realise it's not that much different than videos reviewing a new album. I finally get it."
A break for mental health
In May 2024, Buttermore announced her permanent social media break, explaining that stepping away had dramatically improved her mental health. She described it as a "judgement-free space" where she no longer suffered from anxiety that once made daily life overwhelming. She acknowledged missing her community but emphasised that her wellbeing had become her priority.
Even during her hiatus, fans occasionally glimpsed her through Nippard's Instagram, where she would comment or post supportive messages. On Valentine's Day 2026, she wrote, "Love you forever," demonstrating her continued presence in her online circle without actively sharing content herself.
X| @stephanie_bu316| Mental health and criticism led to Buttermore leaving YouTube Her death on 6 March 2026, announced by Nippard, prompted an outpouring of grief. He described her as "a remarkable woman whose warmth, compassion, and dedication to research will always be remembered." Stephanie Buttermore's story underscores the challenges of balancing personal health, public scrutiny, and a career in social media, offering a poignant reminder of the pressures influencers face behind the scenes.