Can I snack when following the 28 meal plan? Depending on which program you're on, the amount of recommended snacks varies. You can find out more about this via our snacking guide within the program. Related articles What should I snack on? What about water, how much should I drink each day? Do I have to change the serving size to cater for leftovers? Any tips on keeping my grocery costs down? Do I have to change the meals when sharing with my partner?