Who was Jeff Nippard’s fiancée Stephanie Buttermore? All about the fitness influencer, scientist, and partner behind the popular YouTube star

Stephanie Buttermore, the fiancée of popular fitness YouTuber Jeff Nippard, has died at the age of 36. The news was shared on Friday through a message posted by Nippard’s team on Instagram. The statement said the couple had been together for nearly ten years and described her as someone who meant “the world” to him. The announcement came only a few days after Stephanie Buttermore celebrated her 36th birthday on February 25. At the time of writing, no cause of death has been publicly shared.

Stephanie Buttermore was known in the fitness world not just as an influencer but also as a scientist. She had a PhD in pathology and cell biology and studied ovarian cancer. Over the years, she built a large online following by sharing workout routines, honest talks about body image, and parts of her daily life with Jeff Nippard. Fans who followed their journey for years quickly filled Nippard’s social media with messages of support after hearing the heartbreaking news.






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Who was Stephanie Buttermore and how did Jeff Nippard’s fiancée become a well known fitness influencer and scientist

Stephanie Buttermore built her reputation by combining science and fitness in a way that many people could understand. According to information shared on her YouTube channel, she earned a PhD in pathology and cell biology and focused her research on the molecular processes that drive ovarian cancer.

But even while working in science, she also became widely known in the fitness community. Her videos often explained training, nutrition, and body image using clear and simple ideas backed by research.

On Instagram, Stephanie Buttermore had more than 500,000 followers, where she posted workout clips, lifestyle updates, and photos with Jeff Nippard. Her content often encouraged people to feel comfortable with their bodies and to focus on health rather than unrealistic standards.

However, in May 2024, she stepped away from Instagram for personal reasons. In her last post, she spoke openly about how leaving social media helped her mental health.

“I no longer struggle with anxiety. At all. It was almost crippling a few years ago to the point I felt I couldn’t breathe or leave my house,” she wrote.

“Now I really don’t have to care whether people liked what I posted or if they are saying negative things about me. I also don’t have highs and lows from periodic dopamine hits every time I open the app. I’m living in a judgment free space and it’s peaceful here.”

Her relationship with Jeff Nippard was also well known among fans. The couple got engaged in October 2022 after dating for several years. Jeff Nippard once shared that their connection started when he sent her a message on social media.

“We started Skyping for 3-4 hours every day for about a month until I went to visit her in Florida from Canada,” he wrote earlier. “Our first date was a shoulder workout and I will never forget it.”

Jeff Nippard himself has 3.7 million Instagram followers and more than 8 million YouTube subscribers, where he shares science-based fitness advice.

After the news of Stephanie Buttermore’s death became public, fans and fellow athletes shared messages of sympathy in the comments. Bodybuilder Johny Münster wrote, “I’m so sorry for your loss Jeff.”

Another fan added, “We love you so much Jeff… been following yours and Stephanie’s journey for the better part of 10 years.”

For many followers, Stephanie Buttermore was not just an influencer. She was a scientist, a fitness educator, and someone who openly talked about mental health and body acceptance.

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