On Sunday January 15, this year, 2012, I did not feel like eating and the next day, January 16, I still did not feel like eating, so I decided to see how far this would go. I continued on for 38 days and broke the fast on day 39 because I was behind in my chores and I was so weak. I was never hungry throughout the whole fast.
According to this moon phase calender, I started on the 3rd or 4th day of the waning moon. There might be something to the waning moon theory. I will start my next fast on a waning moon also.