About this 'unhealthy' weight loss thing, and the diet pills.
As far as I know the only legal weight loss drug aside from some that are only prescribed to diabetics is Xenical/Orlistat/Alli. I don't know that this would be seen as an 'unhealthy' way to lose weight though unless someone had a prejudice about medication, and it has no known behavioural side effects I can see.
I presume the allusion is to amphetamine-based diet pills, in which case I'm thinking ritalin/adderall, as they're so commonly prescribed?
I would've thought Jen would've mentioned ADHD in her health rundown, but perhaps not, or perhaps it was a recent diagnosis. Or, perhaps, she was using someone else's drugs. However I guess I feel like if we're looking at someone having a sudden mental break, driving their car around in the mud then ditching their phone and vanishing, I'm not sure how likely that is to be caused by those drugs, as from reading up, the risk of psychosis is quite low, particularly without long-term abuse. Plus from what I hear about american college students and adderall, I think if it was causing psychosis, we'd be hearing about it!