Sure, mental state plays a big role. It could even be that if you had to "choose" between vitamin deficiency vs happiness deficiency, the latter would be more

Sure, mental state plays a big role. It could even be that if you had to "choose" between vitamin deficiency vs happiness deficiency, the latter would be more harmful. But, it would seem that vitamin deficiency is an easier technical problem we should solve regardless. And yet, I don't see any discussion of it coming from CDC or WHO, etc.