You have a good doc to advise you to eat a low-carb diet. The only problem with the South Beach diet is that it still follows the common misguided advice that Saturated Fat is bad.
Here are some off the cuff tips.
Avoid the following
-Sugar (and all of it's aliases, corn syrup, dextrose, honey, etc.)
-Grains (wheat, oats, rice, etc.)
-Vegetable Oils (Canola, safflower, soybean, corn (Corn oil is really bad), etc.)
-Limit fruit to a handful of berries at first
-Avoid foods that make health claims (eg Low & Non-Fat items)
Include the following
-Good fats (butter, coconut oil, olive oil, lard, tallow, etc)
-Eat stews and broth made from bones
-Eat a lot of salad and non-starchy veggies
-Eat as many whole eggs as you want
"Eat as if your life depends on it!"