this and that all rolled into one response
Melanie - You are really working the plan this time. It's good to see you take your health so seriously. How do you feel?
A reminder to the newbies - your goal is 4.5 cups of veggies every day

There are some great tips for adding veggies and some yummy recipes in the upper section of the forum.
My take on the Slim Fast shakes:
The ingredients in the Vanilla low carb Slim Fast:
WATER, CALCIUM CASEINATE, MILK PROTEIN CONCENTRATE, CANOLA OIL, CELLULOSE GEL, POTASSIUM PHOSPHATE, MONO AND DIGLYCERIDES, CELLULOSE GUM, POTASSIUM CITRATE, MALTODEXTRIN, SOYBEAN LECITHIN, SALT, GUAR GUM, ARTIFICIAL FLAVOR, SUCRALOSE (A NONNUTRITIVE SWEETENER), CARRAGEENAN, SODIUM CITRATE, YELLOW 5, CITRIC ACID AND YELLOW 6. VITAMINS AND MINERALS: MAGNESIUM PHOSPHATE, SODIUM ASCORBATE, CALCIUM PHOSPHATE, VITAMIN E ACETATE, ZINC GLUCONATE, FERRIC ORTHOPHOSPHATE, NIACINAMIDE, CALCIUM PANTOTHENATE, MANGANESE SULFATE, VITAMIN A PALMITATE, PYRIDOXINE HYDROCHLORIDE, RIBOFLAVIN, THIAMIN MONONITRATE, FOLIC ACID, CHROMIUM CHLORIDE, BIOTIN, SODIUM MOLYBDATE, POTASSIUM IODIDE, PHYLLOQUINONE (VITAMIN K1), SODIUM SELENITE, CYANOCOBALAMIN (VITAMIN B12) AND CHOLECALCIFEROL (VITAMIN D3). SWEETENED WITH A NONNUTRITIVE SWEETENER.
South Beach is about whole natural foods as much as good carbs and good fats. While these might be alright once in awhile in an emergency I wouldn't touch them on Phase 1. It's important to retrain your palate and develop new and healthier eating habits. OTOH as far as I can tell there's nothing in them that is not allowed though I'm having some trouble deciphering everything on that list.
When most people here mention protein shakes they include things like healthy natural protein powders (100% whey or hemp seed, for example), a "milk" and fruits and/or veggies. Fruits make these Phase 2 but they will give you more energy and nutritional value than those pre-packaged shakes.