Fasting and timing of eating are interconnected, as epinephrine and cortisol levels increase when blood glucose is low, typically after 4-6 hours without eating.

“Fasting and timing one's eating are two sides of the same coin. So even if you're on a kind of standard three meal a day with a couple of snacks in between diet or nutrition regimen, you are fasting whenever you're asleep, or you're not ingesting any calories. So unless you're hooked up to an IV of glucose you are fasting while you're sleeping. There are several different kinds of fasting that can relate to epinephrine and cortisol.”

“fasting and timing ones eating are two sides of the same coin when our blood glucose is low cortisol and epinephrine are going to go up anytime we hav't eaten for 4 to 6 hours levels of epinephrine and cortisol are going to go up pretty substantially”