In his underrated and mostly forgotten novel, Beautiful Losers, one of the greatest songwriters of all time, wrote a long diatribe regarding his unfortunate state of constipation.  One line stayed with me for these nearly forty long years:

How can I be creative today with all of yesterday still with me?

Rav Nachman says not only can you be creative, but you can fix yesterday by fasting today–transforming that waste into energy. Yom Kippur, the unlaxative!