I am on a 10 day liquid pre-op diet. I can have any kinda of low carb shakes as long as the total carb level is less than 4 gms. I can have sf jello, sf popsicles and broth. I can have as much of all the things as I want. Reguardless of how much you can have it still doesn't seem to satisfy. I am on day 2 and today was easier than yesterday that is for sure.