Great article, as always.
My daughter has scoliosis and as her posture deteriorated her mood did too but daily, chronic pain was definitely a factor and as she became more hunched over, people always telling her that she was shy, and trying to force her into a role, just added to her growing depression.
Since she was diagnosed, 15 months ago, she has had chiropractic adjustments twice per week using the advanced biometric correction technique. At first I was skeptical but I felt like I had to do something and the local hospital was only offering her physiotherapy, which does nothing for scoliosis and x-rays incase her spine deteriorated to the point of surgery.
I'm happy to say though that her posture is almost normal now: her shoulders and hips are level, her legs are now the same length and her pelvis is only tipped 1deg rather than 4. Mentally she's back to her old self and she rarely has back pain any more, despite her having what began as a 32deg 's' curve in lumbar, thoracic and neck. Her 6 month X-ray showed a tiny improvement, 29deg but the fantastic thing was that there was noticeably more space between many of her disks.
She walked into her first appointment in pain and walked out pain free, which lasted a few days and for that reason alone, I gave them a chance.
After about 6 months she could do things that she'd never been able to do, like touch her toes with a flat back and squat down to the ground (we could never understand why she was so inflexible having had dance lessons since she was three.) Then she was forced, over the course of a week, to sit in bad chairs at school, for a few hours a day and she couldn't squat or touch her toes again until she'd had 3 adjustments.
The best thing is that after getting mostly Bs and Cs in her mock GCSEs, she went on to get mostly As and a few Bs because she was mostly pain free (and had a nice wedge to sit on!)
It's an incredibly slow process and it costs a fortune because it's too cutting edge to be believed.
I think that posture as well as pain affects mood and personality. I think that when people become stiff and inflexible through age and injury, they become more risk averse and I think this is nature's way of preventing people from actions that could fatally injure them and I think that this necessary risk aversion is linked to bad mood! Nature couldn't devise a way of ensuring that fragile people said, "no" to just the dangerous stuff, so it turned them into all round grumps, that reject anything exciting whatsoever!