"WHEN" you fast...in the believers life it is a given that people should fast.
Fasting for the believer is Not a suggestion.
Next Sunday we will begin a fast (Sun-Wed or Sun-Sun)
The heart of a fast is denying yourself, take up your cross (unto death) and follow HIM....it's an ongoing process. The practical part of fasting is the denial of self.
John 10:10 ; Matthew 6:16-21