Cooking your veggies with too much heat for too long a time can make them soggy and bland. It can also destroy their vitamins. Try to lower the heat and limit the time you steam, boil, stir-fry, our sauté your veggies. A little heat is good, because it breaks down the plant cells, which frees the vitamins your body needs. But too much heat strips the vitamins right out.
Did you know your veggies tend to lose some of their vitamins in the water you use to steam or boil them? Try putting your veggies in soups, stews, or casseroles, so the vitamins stay in your food.