To add to my previous reply. Adrenal glands will not suffer immediately from being in ketosis, but if a person were to stay on an extremely low carb diet for an extended period of time especially if they used alcohol, caffeine or other stimulants, nicotene and or led stressful lives. Then eventually they would reach the adrenal exhaustion or burn out - resulting in a lot of problems - one of which is a difficulty in losing weight.