Longevity and fasting

Inspired by The MMM (Maximum Mustache March) Challenge, I was just thinking at one extreme technique of saving and reducing expenses. I recently meet some spiritual tradition exponents that are usually having a period of lent, not eating anything for a whole day, also known as fasting. After i talked with them i started to read about the benefits of fasting (not eating anything for 12 or 24 hours). See about this here and here and here.
Doing this for one day a week will result in 52 days over one year, almost two months of no expenses for food. Add the health benefits, longevity, faster metabolism speed, fat gain dramatically decreased and so much more. I am almost convinced to do this.