Hey! I do South Beach!
Staying on P1 for more than 2 weeks is usually a pretty bad idea and one of the biggest traps SBers fall into. The weight you lose in P1 is almost all water weight--it's not until P2 that you start burning fat.
It's definitely tempting to stay in P1...you're used to the weight dropping quickly, and it's scary to sart adding the good carbs back, but sticking to P1 more than 2 weeks is bad for your body and among other things slows down your metabolism...so that your body desperately tries to hang on to your fat instead of burning it! And that's not what you want, right?!
A lot of people who stick to P1 past the 2 weeks find that their weight loss just stalls because there's no more water weight to lose, and once they switch to P2 that it's harder for them to lose because they've damaged their metabolism (which can be fixed, but that takes time)....and according to one of the Daily Dishes put out by SB, people who stick to P1 also are more likely to fall off the wagon or yo-yo diet. And that's not what you want--you want to make this a new way of eating, where losing weight comes naturally and without a struggle, and where it's gone for good!
The best way to go is to slowly start adding the new carbs to your diet after the 2 weeks of P1 are up...a lot of people call it "Phase 1.5". :-) Add some fruit, or some whole wheat toast, and see what happens.
Good luck!
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