Yes you can, I've been doing it for a long time,
according to how your body react to that of course.. I personally need lot of aminos
in order not to lose muscles.
The downside of this is not much the strength loss and possibly muscle loss imho,
which can be avoided, is that your body gets used to that lil amount of calories
and you end up having too lil "headroom" to adjust things if you need to because if you
boost calories back most likely your body will hold on to them, at the same time, your metabolism
will slow down with such big deficit.