When I was in college, there was a day scheduled when students had the opportunity to participate in an Oxfam fast. In return for giving up cafeteria privileges for the day, a contribution would be made to Oxfam, and the student would get a little Oxfam button to wear. It wasn't an ongoing program; just one day.

I wasn't positively impressed by some who signed up, wore their buttons, then "fasted" by going out to eat for dinner - spending more on pizza, etc. than was being donated on their behalf anyway.

For my own curiosity, I fasted for a week. That was the last time I can recall skipping more than one meal.