How are Laxatives are used by anorexics?

I’m writing an english paper about the difference between anorexia nervosa and bulimia nervosa. I came accross laxatives i’m just not sure how they are used and what they help you in. I googled it but it’s better for me if someone who knows well explains it better.

Thank You.

you can eat what you want and as much as you want and right after you are finished eating take a laxative and it will make you poo out all the food you ate and your body won’t absorb any of the calories BUT doing this on a regular basis can lead to anal ,colon , and stomach cancer. I had a dear friend who took laxatives after she ate and she died of these cancers.