"Well, eet's no use crying over speeled mitochondria..." --Ren Höek

I don't think every mental health issue is traceable to mitochondrial dysfunction. But I'm pretty sure it's implicated in cardiovascular disease. Malfunctioning mitochondria can make your arteries more prone to inflammation which leads to greater lipid deposits. I even read somewhere (sorry, can't cite rn) that a major component of arterial plaques is bits of dead mitochondria.