Final Fantasy XIV Database - Ffxivpro.com

I suggest rather then posting a thread in a gaming community, where there are most likely zero medically certified professionals, that you instead go see a doctor.

It may be a simple case of high metabolism, but it could be a case of a medical issue that is somehow preventing you from gaining weight. Only a doctor is capable of diagnosing any potential problems, as well as offering suggestions on how to combat your weight loss. Nutritionists can also work with you if it turns out to be a metabolism issue.