Get outside and move your body. I've lived 10+ years in what most would call an "extreme environment" (arctic circle, often at or below -40 ambient air temp fo

Get outside and move your body. I've lived 10+ years in what most would call an "extreme environment" (arctic circle, often at or below -40 ambient air temp for weeks, very isolated) with few ill-effects. There is no such thing as bad weather, only inadequate equipment (clothing). Getting outside, if only for a 30 minute walk substantially increases my mood. We also supplement vit d, but in my personal experience, outdoor exercise is my main inhibitor.