This is from my SBD Daily Dish that I receive in my email.
Here are some guidelines for buying bread while doing South Beach:

1. Don't be fooled by health claims printed on the front of the package. Products claiming to be "low-carb," "high in fiber," or "whole-wheat" are often labeled that way for the sole purpose of getting you to buy them.
2. Go directly to the nutrition facts panel on the back. Here you will find all you need to know about the bread, including the amount of fiber, the sugar content, and whether it contains trans fats or high-fructose corn syrup.
3. Read the ingredient list first and choose bread made with 100 percent whole-wheat or whole grains. Stay away from breads with ingredients that contain "enriched" or "unbleached" flour. Though they may seem healthy, this may mean that the bread was actually made with "refined" flour, which lacks the nutritional value found in whole grains.
4. Avoid products containing partially hydrogenated oils or added sugar. These items are not South Beach Diet approved.
5. Find a loaf with at least 3 grams of fiber per serving. Most 100 percent whole-grain breads will be rich in natural fiber.

I've also asked the nutritionists at the official SBD website about the new white whole grain breads that have recently appeared on the market. I believe that Sara Lee and Wonder are two of the companies that are making them. They are legal to use as long as they meet the above guidelines.

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