Pretty much, yes.
How old are your birds, in months?
What all and how exactly are you feeding?
I use a 20% all flock all year around....with oyster shell on the side for the ones still laying.
When not laying they will eat much less,
and if they aren't feeling well due to molt, they will eat less.
Any isolating should only last a few days, after that their appetites should pick back up.
What feed are you providing...is it fresh and dry?
Watery poops could be from eating more...