I suggest reading this and other articles that will give you accurate information. You can also search up videos on Youtube of people talking about their ED experiences.
Please be careful when writing about these sensitive topics and be sure to research. It may be a time-consuming process, but you don’t want to accidentally offend anyone and/or use harmful stereotypes.
Honestly, in my personal opinion, not trying to be rude, sorry if it comes out that way 
, I don’t think you should write about something you have never experienced. But hey, whatever floats your boat! Good luck.