Well, monitor yourself. Are you feeling ok? Sleeping well? Have enough energy?
That's pretty low there. Have you run your height/activity level/goal weight
through a calorie need calculator? What does THAT say? Could you not eat less than what a sedentary goal weight person of your height would eat?
Because you can't keep lowering it to nothing. It's more effective to eat at range, then EAT MORE do you can lower back down to range to shake things up than keep cutting down to nothing.