yes! anything over would probably be UNhealthy. you are doing great.
It is healthy if you lost the weight from making changes in your diet. Especially if they are healthy changes that you can maintain long term. If you just lost the weight for no reason, then keep an eye on it, it could be a warning of something else going on.
It depends, maybe it s bcos you might be having too much stress,(work, school),but if not so, then you have to see your docter, in order for you to be rest assured.
