James Cameron

In 2011 Oscar-winning director James Cameron began an all-vegan diet. A long-time environmental advocate, Cameron made the change explicitly to help save the planet, namely by lowering his carbon footprint, but the record-setting deep-sea diver also found that it also drastically improved his health, what he calls "a win-win."

"The great thing about this as a solution for climate change — one of a number of solutions that we need — is that it's a win-win. You're going to be healthier, you're going to live longer, you're going to look better. You're going to have fewer zits. You're going to be slimmer. You're going to radiate health. You're going to have a better sex drive. That's what shifting away from meat and dairy does.

My whole family did this, and we're doing spectacularly well from a health standpoint. I have not had a single sniffle, not a flu, not a cold, nothing that's taken me offline as much as an hour in three and a half years. Now, that's either the biggest, craziest, statistical anomaly in history, or there's a strong causal relationship with this profound diet change that we did.

The blue zones [five regions around the world that researchers have identified as having the highest concentrations of centenarians in the world] prove this diet works. You have people from separate cultures who aren't related to each other in any way, but what they all have in common is they eat very little meat and they eat diets high in plants. They also do other things like they move naturally all day long. They don't go to a gym three times a week for an hour and think that that's going to offset the 12 hours of sloth sitting at a desk in front of a screen or sitting at home playing video games. So there's a whole constellation of things that make you a centenarian in these blue zones, but the one resounding common element is they eat mostly plants, and I took this to heart three and a half years ago and went 100 percent plant-based."

* The content of this page was excerpted from a Men's Journal interview by John Gaudiosi.