\" \" Restaurants have gotten much louder in the past two decades. Restaurants manipulate diners in any number of ways to influence food choices and consumption, from lighting to menu to server presentation. Unfortunately for those headache-prone restaurant goers, some places also choose to crank up the tunes and the background noise. So, the faster, louder music gets people to down their food more quickly, relieving the table for future customers. Loud, fast music activates the sympathetic nervous system (the 'fight-or-flight' response), which opposes the parasympathetic system and thereby diminishes appetite.