Dr. David Heber,M.D., Ph.D., Director, UCLA Center for Human Nutrition wrote that we should be eating 7-9 servings of veggie/fruit in his book “What Color is Your Diet?” Why colorful? Each color is for a specific organ.
Vegetables, like salad greens, broccoli, green beans, asparagus and zucchini, are low in calories but high in volume. Each vegetable serving is about 25 calories, and
typical serving sizes are 1 cup raw, a half-cup cooked or 2 cups leafy vegetables. Interesting because you can eat 7 servings and still only be 200 calories, without sauce and butter, of course.
Starchy vegetables, such as corn, potatoes, sweet potatoes and winter squash contain more calories, about 70 calories in a half-cup serving.