Depending on your intent fasting can be for a lot of things.
The health benefits of fasting aren’t about total calorie restriction, but ARE about shifting when you eat to allow your body to kick over into the fasted state for a period of time to get the benefits of that.
I practice a 24 hour fast once a week, for spiritual and health benefits, not to lose weight, and enjoy a very full dinner after the 24 hour fast.
Ramadan looks very much to me to be about fasting, at least spiritually.
Historic precedence doesn’t exist... till it does.
No one wants to carry around chickens to trade.
The value of a monetary asset is in its interoperability, and backers of Bitcoin are working to enable that to a high degree.