Fortunately, my brain likes to include both food AND exercise in my dreams so I feel less guilty.
For example....one night a week or so ago I dreamed that I was running and it felt so fantastic I didn't want to stop. I ended up running like 20 miles and then I found this farmhouse out in the middle of nowhere and a sweet little old lady gave me homemade lemonade and chocolate cake. It was a very nice dream.