Neurofeedback to Become “Head Strong”

I’m reading a new book, Head Strong by Dave Asprey, in a personal effort to lose weight — I mean, increase my energy! Just kidding — it’s all about losing weight and looking good. As much as I want to buy into this philosophy, I am aware that I don’t really trust Asprey’s claims. Is it true that if you eat foods with polyphenols, so-called “plant chemicals,” such as blueberries, that the molecules will somehow digest, find their way into your brain, and “grow new neurons” (52)? If I ingest good fats with DHA, will that really mean I will