Thats the thing
Paying attention to it
There is a trend towards following gurus in competitive bodybuilding, a guru isn't going to know how your body reacts to certain things.
A good bodybuilder should know the difference between stomach bloat from food, orals, slin growth and other contributory factors.
From that working out a plan to maximise growth/fat loss potential without showing up on contest day with a distended belly.
But nope, Joe Schmoe guru says slin load pre contest, eat this amount of carbs etc. and it leads to hypoglycaemic anxiety in the athlete, use oral steroids prior to contest for various reasons and bang...
Theres no excuse for this at a professional level...