Don't feel like eating .. (possible TW)

Though I haven't been purging, I have noticed that I haven't really been eating as much as I should.  Some days, my total calories for the day falls below 500, others I make it to 1000... but I never seem to make it beyond about 1400... that's around half of what I am supposed to be eating.  I just don't know how to increase my food intake without wanting to purge.  Especially when I have little or no desire to actually eat anymore.  I'm not sure how I am going to handle the holidays.  I am supposed to go to my mom's, and I know she will make me eat.  I just don't know how I can handle it.  My weight is staying, it's not like I'm dropping (even thought it would dome good to loose some more), but I can't seem to manage to eat any more than I have been.