I don't have a theory on that.
Could be a number of things, the air, brain signals, I haven't thought about it. I'm always open to science though.
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re: fasting, a bit of a factoid a few here prolly know but maybe some do not.
the word *breakfast* has its etymology in the phrase *breaking fast*, i.e., ending the night's fast.
humans have been intermittent fasting for eons now, it's just the timelength of the fast needs to be longer. 12 hours from the last meal to breakfast is the bare minimum. 14 hours and you'll be making a difference. 16-18 hours is real deal maximum benefit.
another great thing about it is you get to gorge. instead of breaking up your cals into 5-6 small meals (another myth btw, to sell more food, there is no benefit whatsoever in this protocol, no, it's doesn't change metabolic rate), anyhoo, instead of a 350 calorie meal and finishing feeling hungry. you get to eat a more reasonable 500-750 or so cals per meal, you leave the table feeling full, satisfied and satiated.
and I'm with bronco, being able to control my mind re: hunger pangs is a powerful feeling.
