She like BMI 17. Its sort of an ongoing thing. She eats probably around 1800-2000 calories daily. I count assiduously, she doesn't. Shes actually gained about 12 lbs since we starting dating, and is much healthier now.  Her older SSRI's were lowering her appetite drastically - new ones don't - actually increase it which has been good. She naturally has an extremely low appetite.