Boy, Bruce Lee seemed inhumanly fast. He trained every part of his body to the limit so he could strike with devastating force and also 'be like water'.
I also wondered what somebody with his physical abilities would eat. Would he be extremely picky or not care? The wikipedia page mentions a little of what he believed, but, perhaps there's a credible book out there that goes into detail what his diet was.
My only concern would be the ingestion of excessive protein to build strength.
If you read up on the human body's "IGF1" insulin like growth factor 1 , medical researchers are seeing a link between protein and cancer.