Hi. Odd situation at my workplace. Long story short female colleague has lost alot of weight over last year, beyond what looks healthy. She appears to eat no carbs at all, and yet is completely obsessed with food, talking about it, looking at pictures. Our workplace often gets gifts of biscuits etc as well as home bakes and birthday gifts and these are on a shared table in the staffroom. Over last few weeks things have been disappearing noticeably more quickly than usual, and we have been finding food in bins, sometimes half eaten. She has been seen taking food out to bins, and someone saw her spitting food into a tissue. We don't know how to deal with this - she seems obviously unwell , but we have tried to talk to her before and she denies having a problem. But she shouldn't be throwing away food that was bought or baked by staff and customers for us all to share. How should we approach her, if at all?