If you pick up a Eat Right for your Blood type book at the library or a thrift store, you probably will find that some of the foods he lists as not beneficial for A types are ones that give you a blah or slight bloated feeling after you eat them.
That's what I noticed for me. type A also.
I don't follow it or any diet plan strictly - but use the info to make better choices for me.

You don't have to stop all meats, it's your choice - basically each type of food has 3 categories - good, so so & not so good.