i actually read about a study where they determined that the initial (usually rather drastic) drop in weight on atkins was not due to water loss. they measured body compositions at start and i think 2 weeks and found that it was fat loss, not water.
after about 2 days on atkins though you will find a drop in weight that usually comes back in a couple days of normal eating which i think is probably partially related to extra water retention and higher body glucose levels.
but yeah, long term weight gain will often come back because most people will go back to their old lifestyle and eating habits once they've reached their goal.
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shabbat shalom, mother fucker! - the hebrew hammer
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