I Have Been Darting More On My Period. I Doubt

I have been darting more on my period. I doubt it's a weight issue because I'm 5 foot 1 inch tall and around 105 lbs. I don't have any outstanding issues other than normal period discomfort for the first 2 days and some mood swings a few days before the start. I thought it was what I was eating during that time but I just seem to far more during my period despite what I eat.