It's the hormones.
Women store estrogen in our fat cells. As we lose weight, that estrogen is released into our bodies. With rapid fat loss, like what happens on IP, LOTS of estrogen gets released which can wreak havoc on our moods and our cycles.
I actually skipped a period my first month on IP, then had two in one month, both heavy and extra crampy. It's evened out now and I'm pretty much back to normal, but man that was not a fun two months!
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