Bad move. Imagine how many ice creams they'd want! The whole office could want a 99 with chocolate sauce and sprinkles, and that's the food budget blown!!
Fat adults? Their choice. They'll probably get all the diseases which go with morbid obesity and die younger than they should anyway. It's a free country, let them stuff their cake-holes.
Fat Children? If it's caused by the parents stuffing crap down them with no regards to calorific intake...