I once heard that the original 21 gun salute was actually delivered in four volleys. 1, 7, 7, 6. Obviously the year of this country's birth. This was then consolidated to three volleys of 7. Either way it's done, you end up getting the number 21.
Well I hit my own 21 milestone today. This morning I was 21 pounds lighter than my average weight before entering the hospital. I've started eating bagels with cream cheese in the morning to try and gain that back. Hopefully that will make up for the week of not eating.