It's a good question. Bruce developed his punching power through a combination of weight training, calisthenics, and martial arts practice (developing the right neurological pathways to make the punch more efficient).
You can learn more about developing your strength, speed and power in the following articles;
On page 262 of the 7 seconds to a Perfect Body book, you state that eating quicker can give you 2 days worth of calories. I wanted to know if you meant