i would say when it affects your health, i mean disorder implies something wrong. if your BMI is within health limits its shouldnt be a problem however if you start getting symptoms like light headedness, dizziness definetly not a good thing but im not a doctor
If it affects your health and you can't stop doing it, then you've got some kind of fixation on it. I think it's a good idea, because your body was made to have food at uncertain times, or unexpected lacks of it for a day. Digestion also uses a lot of energy and organs.
This. Problem with anorexia isn't the fasting, it is the body dysmorphia that caused the fasting in the first place. If you actually need to lose weight, then it's not anorexia. If you are underweight and malnourished, then fasting is anorexia.
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