its got to depend on who is saying it like other posters have said and what they mean as some people can be watching out for your best interests and health yet others may be doing it to sabotage you or undermine your progress, you always need to be aware of what the motive is, if its just out of genuine concern then its much better.
The thing is it is easier than you think to go from one extreme to the other, many people don't but others do, I have a binge eating disorder which involves starvation and binge urges and whilst I am trying so hard right now to do the moderation thing thanks to help from my eating disorder therapist I have constant binge and starvation urges. When I am not dieting, the binge urges are much stronger than the starvation ones but when I am trying to lose weight the starvation urges become much stronger than the binge ones and whilst my body would not give that impression , my thoughts can become similar to that of someone with anorexia, what shocked me was when I do group therapy with people who suffer from binge or compulsive eating disorders alongside those who suffer with anorexia or bulimia even though our bodies are totally different in size and shape our thoughts are so scarily similar! I once did a VLCD something which should never be done if you have an eating disorder of any kind and I became really slim and got more and more addicted to feeling empty and not having proper food, its just as dangerous as when I eat massive binges and get really large.
Em