great read...from my experience i would have to say that stress plays a much higher role then i ever thought it would...
i got to 4% bf with NO PROBLEMS what so ever a year or so ago...i wasnt really trying to do that, it was just one of the best times in my life, it was prolly the most stress free time in my adult life and DAMN did it show. Weird things started to happen like my fingers and lips cracking and someone offered to do a bf test and it came out at 4% on a 9 pt and he said that it would be bad to maintain that so i rose up to ~6% and stayed there without a problem UNTIL stress hit and wow what a difference, damn near overnight. everything changed, and i could not maintain the leanness.
heres a pic, i wasnt big at all but i was pretty lean..which indirectly ended up casuing the stress...