Hi,I am not a professional.though I am training to be a pharmacist. So I can give some inputs. your calory intake is not the only factor decides your weight. there are many factors like hormons, other drugs you take (such as steroids) etc etc. Do you know I read recently an amazing news from a health and nutrition expert for ymoms. Your body type is a type of metabolism. It is decide by four major glands are the thyroid gland, the adrenal glands, the pituitary gland and the gonads or sex gland which secrete hormones. Sorry I cannot repeat the whole story here. Go to Google an key bizymoms expert Morrison and Dr.Elliot D. Abravanel. look like real professionals. Hope you will get some insight.
Good luck!