An uneven book. Lots of coffee info here- probably the best source on health aspects (phenols, caffeine etc.) but often disturbingly flaky. Take the diet part per se, the whole last half of the book. What makes him a nutritionist? A coffee expert, maybe, but on diet???'
Then there's the lack of an index- ARG!
See: https://www.caffeineinformer.com/coffee-lovers-diet for more in this vein. Coincidence or no, his bio pic gives the impression of a Dr.Oz wannabe, a real Hollywood Dan type that, if you met him would have you checking where your wallet was (grandmother- what big teeth you have!).
His advice on best coffee types is fairly useless, but that's not his fault, for, as he admits- the scene changes continually, and he does supply web links for fresh information. But even that won't help you, for it's online only. If you want to get seriously into coffee you need to know who gets the best beans and is the best roaster in your town. Lotsa luck with that.
He goes overboard with technical details and ignores some basics.
For instance- greek/boiled coffee, the healthiest way to drink coffee. Many people hate it because it's sludgy. Fair enough- but what he doesn't mention and most people don't notice, is that's trivially easy to filter out the gunk. I do every day! And making coffee this way requires no exorbitant fancy coffee makers or complex procedures. (See his 2 pages on 'cowboy coffee').
The book is useful for advice on grinders and related gear.
I wish he'd included more information on caffeine. I gather that, if you're a fast absorber (can, say, nap a half hour after drinking espresso) you can guzzle away, but he doesn't nail that part down.
Anyway, if you're seriously into coffee, or want to be, this book is worth a gander. Just keep your BS detector turned on.
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The Coffee Lover's Diet