Blood Type?

After doing some looking into Blood Types, and whether there really is an ideal range of food that each blood type should be eating, my husband Nick gleefully pounced on the fact that he's an O+ and I'm and A+
I think... I guess...  I'm not actually sure.. I had a child, had surgery in hospital, do blood tests, etc... but I'm thinking I vaguely remember being A+... shocking I know. The book's called Eat Right For Your Type.

So, according to this dietary theory - which sounds pretty logical - here's where you add your COMMENTS and let me know whether you think this is completely unfounded, or could be true -
He is an O+, and is therefore "A Meat Eater!"
cue angels singing sweetly, Lion King-like ray of light strategically shining through cloud, confetti raining down, cheerleaders, etc etc

He is so pleased at this that he refused to eat rice for supper last night, "Dear, my blood type says I'm not supposed to eat too many grains", and happily turns to me to ask when next I'm going grocery shopping because the book says he can technically have meat everyday, for almost every meal if he wanted to, as long as its balanced with enough veg.. the right veggies, mind... not mushrooms, potatoes, sweetcorn, and a bunch of others he was reading out to me last night... He did remark this morning that Avocados are on his Foods To Avoid list, but while longing looking at the last one on the kitchen counter, that he might make an exception for them.... :)

For those of you who KNOW my husband, look again, yes, up there, read carefully.... Yes!! HE READ!!! Nick doesn't read (or so he says). Rather he claims often, and loud, and clear, that he's allergic to books, that they make him fall asleep, and he can't see why anyone would waste good time reading...

So, I'm thinking that if he's so interested in food, and while he's on this quest to discover as much as he can Justify to Eat, maybe I'll buy him some more food books... as long as he's reading, right?