If you are worried about losing weight, get up and move. A fun way I have found to do that is get your heaviest cosplay boots out, and put on Just Dance (whichever version you prefer) and dance. I didn't realize how out of shape I was until I started dancing in four inch platforms. I am working to get rid of my belly roll by March. It is late January, so I am in full rush.
Costumes completed: Kenpachi Zaraki, Elanor Lamb,
In progress: Big Sister, Spiderant King (planning stages)