The SlimFast Snack Bar contains just 99 calories and is made with chewy caramel combined with milk chocolate to create its tasty flavour. The bar is perfect for on the go or can be enjoyed as a snack at home. Slim Fast Choc Caramel Snack Bars are a quick and easy milk chocolate coated soft nougat and caramel snack that can be enjoyed as part of the Slim Fast 3. 2.1 Plan. With just 99 calories per portion, they make the perfect snack on the go or to be enjoyed at home to aid in your weight watching journey.