I don't know, but 1500 seems very low. I would ask a health care professional before going on any diet. THere may be medical reasons to be careful. FitDay is here for information, support and logging tools and does not replace the advice of a health care provider. Are you drinking water? A health care provider also will advise you on how much water to drink per day.
Good luck. We are here for you. See a health care provider and stick with it!