It’s one thing to thrive on a plant-based diet as a skinny endurance athlete. But what about sports that place a premium on size, speed, agility, power, quickness and just plain brute force?

Is it possible to compete at the highest level of the NFL not as a punt returner, not as a quarterback or even a running back, but as a defensive lineman – a position where only the absolute biggest, baddest, strongest and fastest survive?

Meet David Carter — aka The 300 Pound Vegan.

Introduced to the game at age 5, David began his football career playing Pop Warner. He made waves at Fontana's Kaiser High School in Southern California and went on to become a star player at UCLA. In 2011, he was drafted by the Arizona Cardinals in the 6th round and has since been a bit of a journeyman defensive linebacker, playing for the Dallas Cowboys, the Oakland Raiders and most recently the Jacksonville Jaguars.

Like most athletes, David grew up eating tons of meat, fully adhering to the conventional mythology that in order to become muscle you must consume muscle – the more the better.

But as his career matured, David became plagued by a variety of persistent, chronic injuries including arthritis, tendonitis, nerve damage and chronic muscle fatigue. Not surprising given the nature of his job, but nonetheless devastating — ailments he simply could not overcome that left him sidelined despite the best sports medicine and rehabilitative resources of the NFL at his disposal.

David soon realized that in order to continue playing, something had to change. He began researching the cause of his conditions, as well as alternative remedies to resolve them at the source. Heavily influenced by a series of documentaries that included Forks Over Knives and the holistic lifestyle habits practiced by his wife Paige, David arrived at a rather counter-intuitive conclusion for an athlete whose professional career relies entirely upon physical prowess and sheer brute force:

all the nutrition he had been relying on to maximize his size and strength was actually killing him.

Therefore, in February 2014, David made a rather radical and quite controversial decision: he adopted a 100% plant-based diet.

Criticism came swift from all sides. Trainers, coaches, friends and fellow players all chimed the familiar refrain: it's impossible to maintain your weight and strength without meat!

But David has remained steadfast and confident in his decision.

Why? Because a battery of unexpected positive results came and came quickly. Eating entirely plant-based, David experienced more energy. His recovery time was profoundly accelerated. His stamina went through the roof. To the great surprise of his coaches, trainers and teammates, every single one of those nagging, persistent injuries mysteriously corrected themselves and ultimately vanished altogether. All his numbers in the weight room actually went up – this is a guy who can bench 470 and squat 660. Amazingly, he found himself quicker, more agile and responsive than ever. And perhaps most important to David, no living thing had to die in order for him to thrive.

Through football and his off the field advocacy for healthier lifestyles, animal rights and the planet, David is now devoted to a cause greater than his on field performance — being an example of positive change in the world.