Early Morning Fasted Training
It isn’t a problem for most individual once acclimated to it.
I am an early morning person and have employed it for a year and a half.
It has not impaired my training.
khangles
“…try it out for a bit to give your body time to adapt and see how you feel.”
Muscle Glycogen
You have plenty of muscle glycogen for training in the morning. Essentially, your muscle glycogen levels are “Topped Off”, full and ready to go.
Virtually, NO muscle glycogen is burned during sleeping. Sleeping is the the longest, lowest aerobic activity you preform. Thus, what few calories burned during sleeping are from body fat, ketones.
khangles
“…The food you eat the night before, the day before that and your body stores don’t magically vanish…”
“Metabolic Flexibility”
One of the benefits of Intermittent Fasting is “Metabolic Flexibility”. You body become more efficient at burning fat, as well as improving Insulin Sensitivity.
Caloric Deficit
The main reason that is works for weight/fat loss is the decrease in caloric intake.
The greatest example of this is…
The Twinkie Diet
"… Mark Haub, a professor of human nutrition at Kansas State University — is the genius who lost 27 pounds in 10 weeks subsisting almost exclusively on Twinkies, Doritos, Oreos and other treats by ensuring that he consumed fewer calories than he burned."
Personal Experience
I was diagnosed with a metabolic condition about a year and a half ago. Research demonstrated that Intermittent Fasting and the Ketogenic Diet could help me.
I went overboard but learn something in the process.
I dropped 17 lbs in 37 days. That means my average weight loss was .46 lbs per day (right at 1/2 lb loss per day.)
I combined the Ketogenic Diet with Intermittent Fasting. The Ketogenic Diet helped somewhat but the dramatic decrease in caloric intake by skipping one meal each day and only having two meals was the driving force.
With that said, I am not an advocate of being as aggressive as I was.
Kenny Croxdale