I always look at it from the prospective of he’s a salesman. He’s only going to share the info that helps him gain money, in this case your buying a book. If he has an infomercial he’s slightly below a used car salesman.
I work with a guy that loves to jump from one fad diet to another. We watched a “documentary†where the narrative was meat is bad because all the pollution In The atmosphere falls on plants and the plants absorb it. When an animal eats the plant they absorb the pollution. So you should not eat meat, just plants. Oh, they spent the last 20 min selling you a blender to make juice from plants. I guess the magic $400 blender got rid of the pollution the plants had absorbed.
That’s my take on fad diets. There’s always “research†and some wonderful Dr that knows better then 98% of the worlds medical community and you should buy his product. But he’s only selling it to you because he just cares about your health.
Heck, just visiting his web page makes him some advertising money.