Cheese (if that's what is in them) contains a lot of unsaturated fat. Sadly, too much of this is not good for you. Double sadly, most of what actually tastes good is either too fat, too sweet, too salty or a (delicious) combination of the above.
U can counteract the negative health effects of cheese balls by drenching them in copious amounts of ranch dressing. This neutralizes the caloric intake they normally have. 4 an added health benefit, wash them down w mountain dew.