Yea. Tim Ferriss has put a lot of effort (and money) into this type of research. He has brought on several guests on his podcast to discuss this subject. He has

Yea. Tim Ferriss has put a lot of effort (and money) into this type of research. He has brought on several guests on his podcast to discuss this subject. He has also talked about his past depression which, I believe, drives his passion towards this work.