The Sonoma Diet is brand new and flavorful weight loss plan that brings together the art and science of flavor and nutrition. Purple Vegetables Yes, there are purple vegetables. Had you forgotten eggplant, Belgian endive, and purple cabbage? You'll also find purple bell peppers, purple asparagus, and purple carrots. Keep an eye out for these beautiful vegetables in your local market. You'll even see blue and purple potatoes, which were once scarce in North America but are now becoming more and more common on grocery store shelves. Smaller than baking potatoes they have a natural buttery flavor, so you'll have no trouble eating them without added fat. For an easy way to add some purple to your day, simply toss some purple kale into a salad. The phytonutrients responsible for the color in these vegetables (usually in the phenol or anthocyanin category) seem to be helpful in slowing the ravages of aging. Urinary tract health and memory function also benefit from purple vegetables. Continues after the ads  The Sonma Diet Author, Dr. Guttersen's Tip Extra Care for Eggplant Eggplant is one of the most delicious ways to get your daily dose of purple, but this delicate vegetable can spoil easily. For the best results, use eggplant within a few days of purchase and cut it immediately before cooking. Letting it sit can cause it to turn brown. So can using a carbon blade knife to cut it, so always use stainless steel.