You’ll also get 3 grams of fiber in a cup of cooked zucchini, but only about 30 calories. Plus, zucchini contains lutein and zeaxanthin—two phytochemicals that accumulate in the eyes and help prevent age-related macular degeneration. AMD is a leading cause of blindness in older people, but much of the damage occurs decades earlier. Find delicious recipes for Zucchini-Walnut Bread and more zucchini and summer squash recipes here.