I'm sure it is in some cases, but overall I think having self control over when and how much one eats is a good thing.

I would be more concerned about unrestrained compulsive eating disorders.

It is interesting that compulsive eating to the point of exhaustion, obesity, loss of mobility, and organ failure is normal, but skipping a few meals is considered strange.

The former is a leading cause of death, while the later is perfectly safe and may even have a number of benefits.

Indicator, not proof. If you're an illegal spy (no diplomatic cover), paranoia isn't a maladaptive behavior. If you're overweight, going days without eating isn't necessarily a sign that you have swapped one bad relationship with food for another - it could just be a way to lose weight. Effective weight loss methods absolutely depend on reining in hunger. Fasting happens do that for some people.

If you weigh 40 kg as an adult and you don't eat for days, you probably have an eating disorder. If you weigh 140 kg as an adult and you don't eat for days, meh?

bingo. As I understand it, disorder is characterized by harm and lack of control. spending time lifting weights for health is usually OK, staying up all night throwing things at invisible monsters is not.