Not just fast food. Seems to me that all restaurants add too much salt and high sodium ingredients to their meals. Olive Garden, for example. Last I looked, there was nothing on the menu under 800 mg. of sodium. If you ask at these restaurants to have the chef not add salt to your food, you are told the meals are prepared according to a set recipe from which no deviation is permitted.
Olive Garden's the worst for salt. They want to sell you more drinks.