There are no "bad foods" IMNSHO. Only people who eat them too much. Fats are good for you, proteins are good for you, carbs are good for you. If you have to choose, choose fats and proteins. If you just ran a marathon, have a Coke. Coke/Pepsi/SUGARWATER feels amazing going down after a long bike ride or run. But it will KILL YOU if you try to live off of it.