People like me don't get fat. I've tried to tell you before. We just burn everything up."
Look Back in Anger, 12.
This quote, spoken by Jimmy, is a glimpse into his character and his anger. Though his quote, literally, is meant to convey the kind of physical energy that Jimmy has in his everyday life, on another level the quote is meant to suggest the kind of destruction that Jimmy brings to the lives of those around him. The word "burn" has a double meaning in this way; on the one hand it is meant to represent a burning of physical, bodily energy. On the other hand, it is meant to convey destruction -- how Jimmy's frenetic quest for real life destroys the lives of those to whom he is closest.