Marc Bates, MPH, a metabolic health coach, has released a groundbreaking YouTube video challenging the widespread medical belief that muscle building becomes impossible with age. The video presents scientific evidence demonstrating that adults in their 70s, 80s, and 90s can gain significant muscle mass through targeted nutrition and resistance training protocols.

Bates reveals that sarcopenia, commonly accepted as inevitable age-related muscle loss, is actually a symptom of chronic insulin resistance rather than natural aging. His analysis of five landmark studies shows seniors can gain 1-3 kilograms of lean muscle within months while increasing leg strength by 20-50%.

"Sarcopenia isn't inevitable—it's a symptom of chronic insulin resistance and inadequate protein signaling, not a natural endpoint of aging," Bates explains in the video. "The aging phenotype is largely optional, especially when you focus on restoring metabolic flexibility and nutrient density through animal-sourced foods."

The video outlines how insulin resistance physically blocks muscle protein synthesis by disrupting the mTOR pathway, the master regulator of muscle growth. Bates demonstrates that higher protein intake of 1.2-1.5 grams per kilogram body weight daily, particularly from leucine-rich sources, can overcome this "anabolic resistance."

Research cited in the video shows that even institutionalized seniors with limited mobility experience meaningful functional improvements. The findings suggest conventional medical approaches to aging may require fundamental revision.

Bates anticipates pushback from healthcare professionals who maintain the "inevitable decline" mindset. "They're not weak because they're old—they're weak because their metabolism's been hijacked," he states. "Fix the insulin, and you fix the signal for strength."