To wonder when a diet becomes dangerous?

[Catchphrase]

When someone is dieting because they're overweight/obese and decide to cut out food groups, restrict calories and up exercise, they are championed and congratulated.

But when someone has a BMI of, say, 22/23 but wants to improve further they're told they are controlling, fussy, need to let loose and have a burger, have disordered eating, are slim enough already.

So is disordered eating only disordered when you're not technically overweight?

Is a diet only considered dangerous (eg anorexia) once you reach a certain (under)weight?

There is a fairly large subset of women who think a diet is dangerous once it gets to the point that the dieting indvidual may become slimmer than they are! It is driven by competition and jealousy rather than concern for anyone's health

This. I am sometimes told that it’s dangerous to exclude gluten , which isn't a food group anyway. And it is in fact bad for me to eat it as I am non coeliac gluten intolerant. I have no history of eating disorder and I’m in excellent health but i still get this advice from randomers.