I think my blood type is B, and most of that fits, although I eat wheat, buckwheat with no problems.  Tomatoes aren't so great for me.  I can have a little cooked tomato sauce occasionally.  I was told by a masto doctor that people with SM have far lower rates of MS than the general population.  Overall, I'm a bit skeptical about  picking foods by blood type.

  As for your own diet, look at the allowed foods list on the low histamine diet page (at ICUS).  Fruits and veggies are great for snacking for me.  If you portion your leftovers and put them in the freezer after a meal, you can thaw them out the next day, and they should be fine.  If you can't tolerate wheat pasta, Asian food stores have a lot of types of rice noodles.  And, there's white, brown, and wild rice, including instant brown rice that's really quick.  I eat other grains, too, like millet.  If gluten's a problem, then gluten-free oats are good.  It's harder when you don't like to cook, but there are things like white beans in cans and allowed nut butters on rice cakes that don't have to be cooked to be eaten.

  If you post what you do and don't like to eat, maybe some people will have low histamine versions or substitutes for the snacks you prefer.  You'll find you feel better if you eat a really healthy diet, and it doesn't have to taste bad either.