Packed with everything you need for a tasty, balanced meal, our shakes can help you lose weight and keep it off* as part of the SlimFast 3.2.1. Plan. And what's more, there's no artificial colours or preservatives. *Substituting two main daily meals of an energy-restricted diet with meal replacements contributes to weight loss. Substituting one of the main daily meals of an energy-restricted diet with a meal replacement contributes to the maintenance of weight after weight loss. SlimFast 3 2 1 Plan® It's simple, easy to stick to and you can eat up to 6 times a day.