BTW, though this proves nothing, but since some are trying to past conjecture and opinion as fact, I will put this out there. During my time training with the Gracie's and the Machado'a I had the opportunity to spend a lot of time -- years -- training and discussing Bruce Lee with people very close to Bruce in real life. I lived in Torrance, CA in the 80s and 90s so the time period and area coincide with my claim. This included Dan Inosantos and Richard Bustillio who took a private lesson with Roger Machado several times a week and I was there watching waiting for the group class that would follow and we spent many hours bull shitting and me picking their brains about Lee. Also, there was Chuck Norris who also trained at the Machado's and helped them tremendously to grow their business. In fact, it was Chuck who brought over one of the Machado brothers, Carlos, with him to Texas when he started that Texas Ranger show. Chuck became a BJJ fanatic and wanted to continue with his training and along with Carlos brought BJJ to Texas.
Never in my discussions with any of these men who actually knew and trained with Lee before he became a star and after he started to make it big ever said he used steroids even when I asked point blank. All, independently, claimed he was a fitness fanatic and never stopped training. Norris made it a point to say that he felt Bruce over did it. Always full of energy, driven, never could sit still. His leaness had nothing to do with him not eating as Lewis claimed. Guru Dan once referred to Lee as a human garbage disposal and always eating. Lee was lean because he never stopped moving.
Again, this doesn't prove anything but this is real live interactions over a period of years and not some heresay or reading second hand accounts from people you don't know that haven't spent the time in real life with Bruce both in training and socially.
There was no "it was well known" among those who really did know Bruce Lee.