"I have to be honest, I indulged," Deena admitted when asked about holidays past. "And I still indulge. I just have to watch what I eat. I try not to eat after a certain time. I just try and keep it steady. That's all I can do."
As for how she lost the weight in the first place, Deena swears by the basics: Diet and exercise. "Most of it was dieting and just running, like, for 30 minutes a day."
For more from Deena, watch the whole video below.
Catch the next new episode of Jersey Shore on Thursday, December 13 at10 p.m. ET/PT onMTV.