Medifast Shakes serve as one meal replacement on the plan. Just whip one up in the blender for a refreshing meal in minutes! There are some slight differences in ingredients depending on the type and flavor of each shake. Check the product labels when ordering if you suffer from food allergies. Shakes are available in the variety packs or separately by box. Be sure to ask for samples of shake flavors with your next order, so you can try out something new!