Wedding planning may have you stressing, but a large pizza, jumbo fries, and a side of doughnuts are only going to give you a momentary lapse from the pressure. Since fatty foods slow digestion down, you'll be left feeling a little tighter around the waist once the sugar high is long gone. These types of foods can also cause your blood sugar to spike, which can lead to sugar cravings levels and negatively affect energy levels.