Is it really worth it changing your diet, only because you read it somewhere in a book? Probably.
And for how long will this motivate you? A couple of days? At the most!
But if you really understand how nutrition works and if you see the figures from large studies what it
can do in disease prevention or in depression then there is a better chance that you change you life
to profit from this.
Getting these figures seems too much work for many authors. It is so much easier just to write: "fruit
and vegetables will make you healthy". This is not how I work. I will give you exact figures of the
latest research. Believing an author is fine, but I want you to know the facts. This is done in concise
short overviews of studies. I consider this a central part of my books.