i do 21/3 since months without any break and consume 220g proteins within 1 hour of my 3 hour window.
i guess if your theory was right (which it isnt, ive read to much over the months to believe so
) then i guess i would have lost an incredible amount of muscle..
and for the guy that asked if you can train hard & fasted:
-absolutely!! i even prefer it to being full and lethargic..
drink 2 black coffee prior to your workout and see if you really lose much intensity (well, maybe when you are doing it for the first time, but your body adapts pretty quick)..
(and please dont kill me because i drink black coffee during my fast. for me im still fasting, idc if some ppl say otherwise..)