Who doesn't love a good burger? Unfortunately, not all hamburgers, or even turkey or veggie burgers, are created equal. Cooking method, portion size and choice of bread and toppings can mean the difference between a relatively harmless lunch and a day's worth of calories, fat and sodium.
We rounded up some of the healthiest and unhealthiest examples of what American restaurants are serving between two buns, and got an expert's feedback on the nutritional pitfalls. Here's what to look for -- and what to stay far away from -- the next time a burger craving hits.