Highest Fiber Vegetables
Avocado
Beans
Broccoli*
Brussels sprouts*
Cabbage*
Carrot
Chick Peas/Garbanzo Beans
Eggplant
Greens -- collards, kale, turnip greens*
Lima beans

Mushrooms
Potato with skin
Pumpkin, canned
Peas -- black-eyed peas, green peas
Peppers
Rhubarb
Spinach*
Sweet Potatoes

* These high-fiber vegetables are also goitrogenic, meaning that they promote thyroid enlargement and can potentially cause or aggravate hypothyroidism. Typically, the risk is highest when these foods are consumed raw, regularly, and in substantial quantity. Cooking eliminates most goitrogenic properties.

Highest Fiber Fruits
Apples
Avocado
Bananas
Berries -- Blueberies, Blackberries, Raspberries, etc.
Dried Fruits -- Figs, Raisins, Apricots, Dates, etc.
Guava
Kiwi
Orange
Pears
Prunes

Other High Fiber Foods
Bran Cereals, 5-10 grams - All-Bran, Bran Buds, 100% Bran, Raisin Bran
Bread, whole grain
Beans, Lentils, Lima Beans
Nuts -- Almonds, Brazil nuts, Peanuts, Walnuts, Cashews

Mary Shomon, About.com's Thyroid Guide since 1997, is a nationally-known patient advocate and best-selling author of 10 books on health, including "The Thyroid Diet: Manage Your Metabolism for Lasting Weight Loss," "Living Well With Hypothyroidism: What Your Doctor Doesn't Tell You...That You Need to Know," "Living Well With Graves' Disease and Hyperthyroidism," "Living Well With Autoimmune Disease," "Living Well With Chronic Fatigue Syndrome and Fibromyalgia," and the "Thyroid Guide to Fertility, Pregnancy and Breastfeeding Success." Click here for more information on Mary Shomon.