no one really desires fasting, to be very honest. it's more like testing your faith in a certain religion and following the rules of fasting.. and by doing so you can overcome addiction.

let me give you a very very realistic example.

30 days of fasting... let's say you're a chainsmoker and you don't smoke till 7:30 in the pm.. sunset.. the time you break your fast..

i personally think that if you succeed going on for 30 days without smoking (given that you're a chain smoker) till 7:30... it does show something that you have strenghts in your power of controlling desires and a strong faith.. the very same faith that made you take a step to fasting and cutting down addictions.

in essence by fasting you are practicing a high form of control over desire. think about THAT.