steaming is the best way to keep all of the vitamins and minerals intact in your veggies from what I underestand
do not microwave, it zaps all the nutritional value out of your food the longer you cook it
anyway, I'd imagine raw is the 'healthiest' method of eating veggies, but are we rabbits or people? I love my veggies steamed, but "al dente" so they have a nice little snap to em. I hate mushy veggies.