UFC referee Keith Peterson recently opened up about his significant weight loss journey, making it clear he achieved his transformation the old-fashioned way. He said that he did it without the aid of popular peptides or GLP-1 meds that have become increasingly common in fitness circles.
During a candid conversation on the podcast This Past Weekend with Theo Von, Peterson addressed the elephant in the room when Von noticed his slimmer physique.
“Are you taking the peptides?” Von asked directly. Peterson’s response was straightforward: “No, I just stopped eating horribly and I’m running every day.”
The Long Island native, who works as a diesel mechanic by day and referees fights by night, explained that at his heaviest, he weighed 186 pounds. It is a significant amount for someone who describes himself as “not the biggest guy in the world.”
His weight gain had been gradual, something people didn’t immediately notice, but Peterson himself knew changes needed to be made.
What motivated Peterson’s transformation wasn’t vanity or a health scare of his own, but rather witnessing the effects of poor health around him. “A few people passed away,” he explained. “Even some of them healthy but just not lucky. So I’m like, got to give yourself the best chance, right?” This sobering realization prompted Peterson to take control of what he could—his diet and exercise routine.
Peterson acknowledged that his eating habits had spiraled out of control. “I was eating a lot really,” he admitted. “Three gallons of ice cream or something? I was eating a lot.”
He recognized the need to make substantial changes to his lifestyle, not just for his career as a referee, but for his family. As a father of three and husband of 23 years, Peterson wanted to ensure he’d be around for the long haul.
The transformation hasn’t been without criticism. Peterson noted that “people, oh he’s sick or he lost too much weight or whatever, but you can never make people happy. You’re fat, you’re skinny.” Despite the mixed reactions, Peterson feels good about his decision and is focused on maintaining his health while trying to build muscle.
His approach reflects the same no-nonsense attitude that earned him his nickname in the UFC. There are no shortcuts, no quick fixes—just consistent effort, discipline, and dedication. Peterson’s routine now includes daily running and mindful eating, a stark contrast to his previous habits.
This dedication to hard work isn’t new for Peterson. The Renaissance man balances multiple careers: diesel mechanic for 28 years, UFC referee since 2009, former hardcore punk vocalist, and wrestling coach for his daughter’s team. His ability to maintain such a demanding schedule while prioritizing his health demonstrates remarkable discipline.
