Do you eat back your exercise calories?

I do if I'm hungry, sometimes I don't if I'm not. Usually I am and I do. I've lost 41 lbs so far with 84 to go.

Edited to add: I know a lot of exercises listed in MFP dramatically inflate the calorie burn count though, so I would be wary of trusting them. Mostly the only exercise I do is very slow walking and from the research I've done, the calorie estimates in MFP are very accurate for that.