I just started following Bryan's journey two weeks ago.
I didn't get the same impression as you. I always thought it's implied he's talking about what's good for him, not all people. He then uses that as a framework for something others could pickup and incorporate in their lives.
I like the iterative nature of his work - he always tries to improve the recipes and supplements he takes.
I always see a lot of negative comments about the guy here on HN, and he's basically hacking his own body and publishes everything for free[0].