I haven't started yet.
the other times (2) I've done SB, I did phase 1 for about a week and felt rundown, probably not eating enough. And then went to phase 2. But both times before, I found out I was pregnant by week 3 and then with morning sickness... it all was over with!
So, I've never really gone beyond 3 weeks on the plan so I didn't know if I was setting myself up for pitfalls by doing it for only one week.