Do you think a long-term consequence of having had anorexia is really struggling strength / fitness-wise if your weight dips? Before I was ill I could easily go long periods without having food without thinking about it. Then I developed anorexia and am now at a much healthier weight again but I absolutely can't manage going without food! I eat regularly or I feel really rough - no energy, excessively hungry etc. I do a lot of exercise now and stand no chance if I don't keep on top of the food. The same goes for if my weight dips by even a couple of pounds. I feel really out-of-energy as a result.
I wondered about your thoughts on it? Is this a feature of having recovered from anorexia do you think? I know you have cf too so your nutritional needs are different anyway but maybe its a bit of a thing for people who have once been at such a low weight / starved for a long period of time?