Popcorn

Though I'm a pretty healthy eater most of the time, one of my few junk food weaknesses is movie theater popcorn -- and the more butter, the better. That oily, artificially flavored buttery topping is what makes the snack worthwhile! It's also what makes it terrible, apparently. Long suspected as a cause of lung damage, researchers are now linking butter flavoring to Alzheimer's disease.

Every day at 4 p.m., like clockwork, one of my co-workers makes a bag of microwave popcorn.