hi Jan
I did that at one point too, but had 5 the next day and felt great. Some people at our class were talking about it and the counsellor said that she wouldn't recommend it as you're not getting the vitamins & minerals that you need, but I think if you make up for it tomorrow there can't be anything too bad. (you could even use the extra pack to make something nice frrom the recipes - I love the fridge cake.)
Our counsellor said though that a client did that for several days, thinking he/she would lose more weight, but felt really tired and lethargic and didn't lose very much weight that week.
don;t know if I've helped at all, just passing on what I've heard. this site is so good - it's my saviour that's for sure!