@katebowles But what exactly does a different handling look like?
Don't have cake/food at all?
Just have it standing in a corner?
Not offer the colleague any of it? (What if you know he is Muslim but doesn't participate in fasting?)

And then there is the athlete preparing for a contest, the persons in weight-loss mode, the vegans...

All these diet restrictions are a choice. My diet plan and motivation also is nobody's business and nobody should make a big thing of me refusing food offers.