In layman's terms this theory is actually quite simple. Blood is needed by all parts of the body to function effectively. There are three main areas that need blood to perform their specific functions, the brain, the stomach and the muscles. There is only enough blood to supply 2 out of the 3. Of the three, the brain is the most important. It enables the entire body to function, thus constantly requires the presence of blood. This means that blood can only occupy one other major area, either the stomach or the muscles.
According to this theory, the body may only effectively use the stomach if the muscles are not in use, and vice versa. Evidence that supports this theory can be found when observing a person who eats a large amount of food and becomes tired, perhaps takes a nap, afterwards. This is due to the bloods presence in the stomach where it enables digestion of the food. The blood is always in the brain, so the muscles become deprived of blood, and become tired. Another example of this could be observed when measuring ones effectiveness to complete a triathlon, shortly after winning a hot dog eating contest. Blood is always in the brain, the stomach is trying to digest food and the muscles are working. Chaos will ensue. One would get a cramp, vomit, pass out or die.
Anyone who understands this theory will be able to predict how their behavior will be affected depending on certain variables. These variables are hunger(H), blood in the brain(b), total blood in the body(B), the speed of light(c), activity of the muscles(m) and mass(M).
For those who cannot understand this complex theory remember the following rules:
If you exercise you will not be hungry shortly afterwards.
If you eat a lot you will become tired.
If you eat a lot then exercise you are subject to cramps, vomiting and passing out.
If you eat 20 minutes before you go swimming a shark will eat you.