Hi Twinmomma,
I continued on phase one into week 3 because I wasn't having trouble following the diet (no hunger paigns or dreaming of chocolate cake) and I wan't to lose more weight, but by day 21 I hadn't lost any more weight and I succumbed to eating too many cashews and that led to four choco liebniz. Looking back, I think it would have been best to go onto phase 2 after the 2nd week as Dr. Agatston suggests in the book. (Also, I saw him on The View today and he confirmed that doing so is best because it keeps the body metabolizing--whereas staying on phase one makes many people's bodies resist the weight loss, according to Agatston).
Anyway, I would suggest adding fruit into the diet first during phase 2. Good luck.
BonBonNY