In the world of elite, method-driven performances, physical transformation often speaks louder than dialogue. Few examples illustrate this better than Cillian Murphy’s decision to abandon 15 years of veganism to embody Thomas “Tommy” Shelby in Peaky Blinders. It was not a lifestyle shift driven by vanity or trend, but a cold, professional reckoning with the demands of character.
Murphy had followed a vegetarian—and later vegan—diet since his teens, originally prompted by health fears surrounding mad cow disease rather than ideology. By the time casting for Peaky Blinders began in 2013, that diet had left him naturally lean. When he looked at himself through the lens of the role, the verdict was blunt: a wiry, slight frame could not convincingly lead a post–World War I Birmingham gang. As Murphy later put it, “I can’t be a fool.” Tommy Shelby could not be skinny.
Breaking a 15-Year Personal Rule
Accepting that reality meant letting go of a principle he had lived by for over a decade. Under the guidance of his trainer, Murphy was told plainly that building visible muscle would require animal protein. The first step was symbolic and jarring: a venison steak eaten in an Irish hotel, marking the end of 15 meat-free years. It was, by Murphy’s own description, “extraordinary”—not just for the taste, but for what it represented.
This was not indulgence; it was function. Murphy viewed meat as a tool, no different from a costume or accent, necessary to construct the physical authority Tommy Shelby demanded.
Forging the Shelby Physique
Diet alone was not enough. Murphy committed to an intense strength-training program built around compound lifts designed to broaden his shoulders and thicken his frame. The goal was not bulk for bulk’s sake, but presence—a body that suggested trench warfare survival and ruthless leadership.
The transformation paid off on screen. Standing opposite actors like Tom Hardy’s Alfie Solomons, Murphy no longer disappeared physically. Heavy overcoats and razor-sharp tailoring—hallmarks of the show under directors Otto Bathurst and Tom Harper—amplified the effect, turning muscle and silhouette into quiet intimidation.
A Career Defined by Extremes
Murphy’s willingness to reshape his body did not end with Peaky Blinders. For Oppenheimer, directed by Christopher Nolan, he went to the opposite extreme, shedding dramatic weight to portray J. Robert Oppenheimer. Co-star Emily Blunt famously remarked on his near-starvation diet, underscoring the contrast with his Shelby era.
After Peaky Blinders concluded in 2022, Murphy returned to vegetarian—and later vegan—living, reinforcing the idea that his meat consumption was never permanent, only purposeful.
With Peaky Blinders: The Immortal Man slated for release in 2026, Murphy has once again been spotted training. The message is clear: when the role calls, principles bend. For Cillian Murphy, that uncompromising discipline is not self-denial—it is the price of greatness.