I have an eating disorder. How is my skin health related to my dietary health?

Very connected. People with eating disorders often suffer from rough, dry, flaky skin, which is caused by not eating enough protein or fat. These symptoms will improve as your diet improves and omega-3 fatty acid supplements can be helpful as well. Your doctor will also check your vitamin d and thyroid levels, as they can be abnormal in eating disorders and cause skin problems.
Very related. Your skin, hair, teeth, and nails need proper nutrition in order to maintain maximum health. The skin cannot repair itself and ages faster and is more susceptible to infection without proper nutrition to provide essential minerals and vitamins.