3. You make unwise substitutions in baking.

Result: You wreck the underlying chemistry of the dish.

Substitutions are a particular temptation, and challenge, with healthy cooking. At Cooking Light it's our job to substitute lower-fat ingredients―to change the cooking chemistry a bit while capturing the soul of a dish. When it comes to baking, this is as much science as art.

"I'll get calls from readers about cakes turning out too dense or too gummy," says Test Kitchen Director Vanessa Pruett. "After a little interrogation, I’ll get to the truth―that the reader used ALL applesauce instead of a mix of applesauce and oil or butter or went with sugar substitute in place of sugar." Best practice: Follow the recipe, period.

• Learn more about the art of low-fat baking