I triggered my roommate's ED on purpose just to watch her squirm.
I find that mean. What made you set off your roommate's ED?
She is always struggling with food and I find it kind of humorous.
If you know that your roommate has difficulty with eating and food, then you have a responsibility to show care in what you say and do around her. Don't bring things up about food that will only create pain for her.
Then I'll keep my mouth shut.
I'm so relieved to hear you'll be more careful. Eating disorders are tricky and I'm sure she'll appreciate you being more thoughtful.