I'm on LL which is basically the same. This is my second time around and I lost fine in weeks 1 and 2 but am now in week 3 and haven't lost anything at all for 8 days. I suspect my body is a little resistant to it this time and is fighting me. I haven't given in yet though as like you, I've lost 1 stone and if I give in now it will go straight back on which would be awful. The maths means we are eating way less calories than we need and the weight MUST go!! Hang on in there!
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