Jello pudding has lactose... so its still not good. It will keep you from fat-burning. Even sugar alcohols, although great for diabetics and keeping insulin spiking down, still count as calories because they are digested.. just slowly.
Snacks that are okay are listed in the Qucik Start Guide... Medifast crackers, or soy crisps, pickles, SF jello, SF popcicles, celery (with a little salsa), etc. Carbs are the key... if you have extra real sugar it will keep you from fat burning.
Also, you gotta get in that last medimeal, even if you think its too late. You can eat on this program inside an hour of going to bed, its not like the old standard of don't eat after 8. So, make sure its 5-1.
Have a great day tomorrow.