Smoking and drinking don't affect self esteem.

Being branded as fat does. Being diagnosed with fat does. And it can cause very real harm.

Of course kids should be encourage to eat healthy. I am not saying otherwise.

But kids should also never, ever be body shamed. It has lifelong effects.

"It's not okay to be fat" = "Your body is a problem that has to be fixed."

Look up the causes of anorexia nervosa.