Here’s an article reporting on a study which suggests that slouching can make you sad. There’s no doubt that your body position and movements can affect the way you feel, but what about people who keep their heads pushed forward to be able to breathe properly?
Which comes first, head-forward posture, leading to depression, or depression making you sad, leading to a head-forward posture?
Having smaller jaws and upper airways can definitely affect the way you sit, stand, and even walk. By not being able to get a good night’s sleep, it’s not surprising that you may feel sad or depressed.