I think it could be related to BPD but not necessarily directly. I mean not all bpd people do that, but the fact that if you overeat, it's a symptom that can vary from person to person with any kind of mental illness or disorder. We do things one way or another to compensate, comfort ourselves and cope with life. With some it may be self medicating with drugs, others with eating, and like with me, various obsessions such as over-doing gaming and doing art obsessively.