Your average bagel is going to cost you about 350 calories, and that's before you add any toppings. But bagels are bad for you beyond their caloric content (and what that will do to your waistline) -- most of them are made with refined white flour, which means all the good vitamins, minerals and fiber have been processed out of them. Refined white-flour foods are linked to weight gain, heart disease and Type 2 diabetes. And not only do they lead to weight gain, they also make it more difficult to lose weight, too.
Not all bagels are this bad for you; choose one made with 100 percent whole grains, choose a smaller, mini bagel or try this trick: If you scoop out some of the soft bready interior from the inside of the bagel, you could save as many as 100 calories [source: Zuckerbrot].