SlimFast Snack Bag Cheddar Bites are a quick and easy snack for on the go or while at home. Each bag contains 95 calories and are part of the SlimFast 3.2.1 plan to help lose weight and keep it off. Slim Fast Cheddar Bites Snack Bag are a tasty snack that can contribute to weight loss and used as part of the Slim Fast 3. 2.1 Plan. The cheddar bites are a wheat and potato biscuit snack which are oven-baked with a cheddar flavour, perfect for on the go or while at home.