@mmt635 Thanks for taking time to reply out of concern. That's a super common mis-conception about eating disorders, and one I might have agreed with before starting this awful journey. Wasn't really here to discuss the ED, but mentioned it because I recognize why my supervision is more extreme than it might be otherwise.
I am so sorry for your friends who are suffering. It's important to know that Eating Disorders aren't cause by lack of control. OCD/Anxiety/Depression are behaviors triggered in some people's brains if their energy expenditure exceeds their intake. Like many diseases, the 'cause' is up to 60% genetic, and there are outside factors that play a large roll in whether or not someone will develop the disease.
What's below is copied from the Mayo Clinic, and gives a better sense of causes and risks. I wish your friends all the best - it can be a super long journey, but with support from caring family - and friends like you -many will recover!
"Eating Disorders are genetic, metabolic, brain-based disorders driven by biology
They are not a choice or driven by a need for control
Eating disorders are triggered when a predisposed individual has a negative calorie balance, taking in less energy than they expend
Initial negative calorie balance/weight loss may be intentional or unintentional
Body dysmorphia and the obsession with being thin are a symptom of the eating disorder, not the cause
EDs are not caused by parents, trauma, bullies, school, or poor self image
EDs affect people of all genders, ages, races, ethnicities, body shapes and weights, sexual orientation, and socioeconomic status
Eating Disorders taken together have the 2nd highest mortality rate of mental illnesses
Anorexia alone has the highest mortality rate of any mental illness due to physical dangers and high suicide rates; up to 20% will die from the disorder"