For me, the answer is a resounding yes! While going through radiation treatments a year ago for my second bout of cancer, I decided to completely overhaul my diet. Part of that meant getting more greens than I ever had before. The easiest way to do that? Blend ’em up into a tasty green smoothie.

I’m feeling more energetic than ever and enjoying my new eating habits. But I’m not the only one realizing the raw power of a simple green smoothie. A 2014 documentary by author, entrepreneur and natural health aficionado Sergei Boutenko, called Powered by Green Smoothies, examined the effects of one quart of green smoothies per day on marathon runners and CrossFitters. The results? Nothing short of amazing: fewer aches and pains and speedier recovery times.

Some have taken this idea even further: Can changing your diet change the world—and extend your life? …