If you dump the soaking or parboiling water and cook the soaked/parboiled beans in fresh water, you lose some minerals but you also reduce your methane production significantly! I made bean-cabbage-millet soup (which decided it wanted to be more of a stew, which is fine with me - less spillage) and I also cooked the cabbage separately. I boiled water and then put the cut-up cabbage in the boiling water for 5 minutes, then drained it in a colander, and added it to the already-made soup. All the flavor, none of the gas!

Love, Columbine (whose day-job office is way too crowded to ignore such things)