You should eat more than 1000 calories because if you eat less than 1250 calories a day, your body will go into starvation mode which can lead to problems such as fainting and making your metabolism slow down. I suggest eating 1400 calories at a minimum so you don't injure your body nutriotional wise, make sure to get enough calcium and iron and stuff like that, or you'll be paying for it a few years down the road.