Why do anorexics drink diet soda?

Diet Soda has little to no calories (depending on the brand or type). Anorexics do not want calories. Soda, even diet soda, will have more tastes than, say, water, so it will also provide that. Soda can also provide energy (caffeine), be filling as a drink, and (if they were also bulimic)the carbonation makes it easier to also throw up later. All of this comes with little or no calories, so anorexics think this is best.