How terribly bad can a Twinkie really be? According to some, not so bad.

It's not that an occasional Twinkie-type treat, or sandwich cookie, or cheese puff, or cracker is inherently bad. It's just that they hog up caloric space. Healthy versions of these snacks are no different.

Think about it this way: If your nutritional requirements are a train, junk foods are taking the seats of rightful passengers -- like a bowl full of berries, for example, or a handful of nuts. Says Stephen Daniels, pediatrician in chief at The Children's Hospital in Denver: What's left after all the nutritional requirements are met are a hundred or so "discretionary calories" to be used like dietary funny money. That' a pretty tight caloric budget, allowing for two cookies, a handful of chips, or well, one Twinkie.