Depends on the man, I remember a few years ago Larry and Jim talking about Hopkins being proud of his 31in waist and how much of a fanatic he is about his body and how he wont even touch a cookie or cake.

Some fighters turn into homer simpson between fights and then have to boil down at the 11th hour, those are the fighters that typically would be effected adversely.. Guys that stay reasonably around their fighting weight between fights arent going to be killing themselves dropping a few more pounds