2.5 stone in a month and a half? Doesn't sound too good.
I'm no expert on the matter, but my understanding is that it's quite unhealthy to lose weight that quickly. In addition to that, you can get stretch marks from losing weight too quick (everyone thinks it's just from putting on weight, but losing it fast can give you them too).
Don't get me wrong, I'd love to lose 1-1.5 stone, but I'd be cautious of doing it that quickly.
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