Vegetables have the greatest health benefits and the least calories of any food group. Unfortunately, many of us don't eat as many vegetables as the food pyramid says we should. This may be because we are used to mushy and dull cooked vegetables that can have additional flavor, but less aesthetic appeal.
Lots of vegetables lose their luster while cooking in boiling water. Broccoli and green peppers turn almost gray and onions become transparent. You can save the red veggies by adding a small amount of lemon juice to the cooking water; beets and cabbage will retain their color.