The document discusses several potential causes of unintentional weight gain, including hormonal changes, fluid retention, medications, and medical conditions that affect hormone levels. It notes that hormonal changes during menopause can cause weight gain around the abdomen and hips in women. Fluid retention can also lead to rapid weight gain from conditions like heart or kidney disease. Certain medications, like corticosteroids and antidepressants, are also linked to unintended weight accumulation.
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