JJ Virgin is a triple board-certified nutrition expert, Fitness Hall of Famer, and four-time New York Times bestselling author who has built two multimillion-dollar health businesses. In 2026, Lindora — a medical weight-loss brand with a 55-year legacy — named her Chief Metabolic Health Officer to lead its "Muscle-First: Everything Else Follows" programming, reflecting her view that sustainable weight loss follows from restored metabolic health rather than the reverse.

Virgin also chairs A4M's Profitable Practice Blueprint and serves as the nutrition and fitness speaker for Tony Robbins' Life Mastery and Unleash the Power events. As founder of the Health Business Growth Collective, she leads one of the country's most influential communities of health entrepreneurs.

JJ Virgin challenges the standard "calories in, calories out" view of metabolism, explaining her muscle-first approach to metabolic health and why building and preserving muscle mass matters more than chasing weight loss on a scale.

"Metabolism is how your body uses calories for energy. And the reality is all calories are not created equal. Your body isn't a bank account — it's not calories in, calories out. Your body, while calories count, where they come from counts more. But it's also a chemistry lab governed by hormones. And it's a history book, where toxins and trauma can also inform your metabolism."