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This is the fourth article in a series about how to prevent and beat cancer by going green.

Dr. David Servan-Schreiber is a lot of things: a world renowned cancer expert, a brain researcher, a brain cancer survivor, a best selling author and a dad. He's also a pioneer at leading the charge to integrate simple lifestyle changes in a plan to help people to beat cancer—or better yet, keep it from occurring in the first place. In this exclusive interview with Planet Green, I asked the good doctor his top three strategies for keeping healthy. Here's what he had to say: