if someone relapses after anorexia and cuts down their eating again, not to the same degree, but still to a low amount of calories with exercise, will they lose weight rapidly or slowly?

if theyve suffered from anorexia before are they more likely to have a quicker weight loss than the first time round is basically what am asking?

and is it healthy to drink two hot chocs a day at 37cals each?
thanks. and please, no stupid answers, this is a serious question.