I doubt it. A bunch of us went on a school trip and we found out that one of our number was severely anorexic. (She claimed to want to get help afterwards, but that accomplishment was basically after three weeks of group hugs.) And I remember there was an exchange:

Anorexic: I'm...really tired. I wonder why that is? Maybe I didn't get enough sleep?
Her Roomate: ...no, it's because you didn't EAT ANYTHING. You're HUNGRY. You're FAINT FROM HUNGER. You skipped breakfast!

...so yeah.