Hey,
I started on 3 packs a day, but bought a few spare because I thought I might need four. I'm five foot seven and a half, so I'm verging on needing four according to CD rules anyway.
Well the point of this post was that for the first week, a quite often had four a day, as a decided it was better to have an extra food pack than eat other food. Since the first week though, I haven't really felt the need for four, so I was going to suggest that you have four for the first week when you feel like it, but that you might find you don't want the forth anymore when you settle into the diet. But everyones different, just play it by ear.
I've found that I have COMPLETELY lost my appetite now, so eating three is usually plenty for me (did not think for a second when I started this that I would be saying that three is enough! Ketosis does strange - and good - things to you!)
Anyway hope this post helps x