Hi,
I don't think that Slim Fast bars or shakes would be considered legal as they are FULL of sugar.
I use the Carbolite shakes and they are ABSOLUTELY WONDERFUL! My favourite is the Banana Blitz one. It tastes so yummy and even with just water in blender it is creamy/frothy! Chocolate is also great. I put in a teaspon of SF peanut butter and blend it up. It tastes like a penut butter cup shake so good. The great thing is that they are sweetened with splenda and don't have any sugar alcohols. If I remember correctly the net carbs are 3 and they are about 150 calories, 3 grams of fat. I often have these for breakfast. I buy mine directly from their website:
www.carbolitedirect.com. Their chocolate bars are to die for too!
Jenn