I really think...

My NUT told me that I was in(at one time ) and could go into starvation mode at any size . I trust her as she is schooled in this kind of thing, It does not mean you are starving only that your body  feels it is not getting what it needs so it retains everything fearing it will not get the nutrients it needs. There may be a scientific "starvation" mode but this is not what they are referring too. Or at least that is not how I took it. I understood her to say a body at any size can go into what it percieves as starvation b/c it is not getting enough. There are plenty of folks on here that have been told that and upped their calories and started to lose again. It does happen though.

That is what my NUT told me when I was training at the gym.