My sister is a grown adult and does not live with us since like 10?15?20 years? We've noticed that, whenever she visits us and we all eat food together, she does not eat, until everyone else is done eating. She always says she's full but since it happens literally every single time, I don't believe that's the reason. In her childhood she always ate with our parents on the table. Together. She has BPD and a lot of her behaviour is a result of her disorder, since she also does not get help. So my question is, is that common with people with BPD? Is it some form of just trying to have control over smth in her life? Or is this just some other behaviour that is not connected to her BPD at all? Really just curious about it since I have no explanation and she apparently doesn't either.