Reply To: How do you fast? Home › Forums › Everything Else › How do you fast? › Reply To: How do you fast? August 2, 2006 at 1:45 am #6720 About Catholics TeamKeymaster My fasting is quite weak to be honest with you. If I don’t eat I can’t survive for the day. I get so moody and my mind gets foggy. I think it really messes with my blood sugar.