Fitness YouTuber Stephanie Buttermore dies at 36

Fitness YouTuber and scientist Stephanie Buttermore has died at the age of 36, according to a statement shared by her fiancé, fitness creator Jeff Nippard, on March 6.

Nippard announced the news on social media, asking for privacy as he mourns the sudden loss of his partner of nearly a decade. No cause of death has been publicly revealed.

Her doctoral work explored the role of the RHAMM protein as a potential screening marker, with the goal of enabling earlier, non-invasive detection through urine testing.

Buttermore later transitioned from academia to online education, where she became known for explaining complex training and nutrition science in accessible ways. Her videos covered topics ranging from body composition and strength training to mental health and sustainable dieting.

In 2024, Buttermore stepped away from social media, revealing that severe anxiety had made it difficult for her to leave her home. She told followers she wanted to focus on her well-being, a decision many fans praised for its honesty.

Despite her reduced online presence, she remained active in Nippard’s life and occasionally appeared in posts on his social media. The couple became engaged in October 2022 and had been together for around 10 years.

Following news of her death, tributes poured in across the fitness community, with fans and fellow creators remembering her for combining academic expertise with compassionate, evidence-based advice.

Buttermore’s legacy spans both science and fitness. Through her research and educational content, she helped millions better understand the biology behind health, training, and nutrition.