If your only eating 1500 and your SURE about that (weighing and mesuring at first is essential. Eyeballing can really throw the #s off) WLS won't really help you much because even those patients eventually end up eating close to that calorie wise it might be less in the inital months, but stomaches expand and most people 6 mo out can eat fairly normal light meals and have to eat more frequently.
Like the others said it could be more of a medical issue. PCOS, Thyroid... make sure you get that all checked out too.
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