Americans coming to Australia have to give their bodies time to adjust not just to the significant time difference, but to the new way that their bodies are processing food. You see, in Australia, and in the Southern Hemisphere in general, food travels through the esophagus and intestines in a counter-clockwise motion—the opposite of how food travels in the Northern Hemisphere. It also exits your body in this manner, which is actually helpful, giving the whole "toilets flush the other way" business.
This is due to something called the Corniolis Effect, named for something I won't go into here, but let's just say it has to do with the manner in which corn digests (or doesn't), which aided in the Effect's discovery.
The best way to deal with this new manner of digestion is to drink lots of beer—that's why the Aussies do it.
This has been another "Tips For Americans," from Little Australia. You're welcome.