I just can't shift any weight!

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I truly don't understand what's going on with my body!
I have been restricting my caloric intake, upping my exercise and trying so hard.
And yet... nothing has moved. It's been two weeks.
Normally, it's not too difficult for me to lose weight, but I'm wondering if the difficulty I'm having has anything to do with the fact that I was on Prednisone.
Anyone have any ideas or suggestions?
Thanks,

Katie xx