
If there's one healthy practice that came out of organized religion, surprise! It's fasting.
Yep, today my psychobiology professor told the class that fasting twice a year was one of the most healthy things you could do for your body. In fact, he said, people who fast twice per year live significantly longer than those who don't.
Let's not confuse this with some kind of eating disorder or crazy 5-day juice only power diet. My professor doesn't want people to stop eating for more than a day two or three times a year.
Apparently, during fasting, the body's energy is diverted away from the digestive system (because there's nothing going on there, obviously) to regulating the metabolism and beefing up the immune system. Also, slower protein synthesis during fasting means higher efficiency, and therefor healthier cells, ergo healthier tissues and organs.
If you've ever had the flu, you know that any kind of food while your that sick is completely unappealing. That's because when your body is sick, it automatically kicks into fasting-mode to flush out your system and focus all your body's energy on knocking out the virus.
It makes sense, then, that periodic fasting over the years will increase your body's overall health and also your life expectancy. However, be careful about fasting; don't just randomly decide that you're going to stop eating for X amount of days. Personally, I think I'm going to start celebrating Yom Kippur with my Jewish friends - at least in the not eating for 25 hours sense.