When I was diagnosed I used Doctor Google to find that a common sign is weight loss. I thought...Cool! But three years later I'm 30# heavier. Pre-diagnosis I was a marathon runner. Post-diagnosis I'm....not.
I still exercise using a treadmill and chin-up bar. Obviously it's not enough to burn off the excess calories. My sloth is so severe that my wife bought fitted sheets with a cell phone pocket; So I can answer the phone without needing to get out of bed.
Then as a joke my wife gave me jeans that are XXXL waist. And they fit.
So I guess there's nothing to do but redouble efforts to lose weight? Or give up and blame the PD.