Eating too little calories! But Im not Hungry!!

cr9576

So Sometimes I have the issue of not eating sufficiant calories. Im suposed to eat 1200 cal but sometimes i eat like only like 700 or 800. Not every day just sometimes, Its like my stomach growls and it kinda hurts but i have no appetite, I dont think its because i am on phentermine becuz I started taking it back in febuary and my body as gotten accustomed to the medication so i really dont have any side effects except a little dry mouth.. is it bad if i go under my cal intake like one or two days a week?

cw-165, 5'3, 21yrs