To the extent I will up GH's if he loses weight or reduce Gs if she's fat then I do, but other than that I don't.
I wouldn't feed less if they had a day off, or if they had a period off work. G I wouldn't even for box rest as she has nothing basically, and GH well he wouldn't "do" box rest so its possibly not relevant lol
But then even GH is on totally fibre based feeds so nothing which would turn him physco.