Doesn't your body produce vitamin D from sun exposure? Just get outside more.
Yes, but (a) your body's ability to do this decreases as you age, and (b) sun exposure has other downsides such as increased risk of skin cancer, so there's a tradeoff involved.
Stop clinging to that as a reason to shelter indoors and replace life with vitamins and manufactured meals.
Different people's skins have different sensitivities. Also, skin cancer doesn't happen in one exposure; the risk builds up over time.
> Stop clinging to that as a reason to shelter indoors and replace life with vitamins and manufactured meals.
Stop making assumptions. I personally have dark enough skin that a reasonable amount of sun exposure doesn't bother me. But that apparently didn't stop my vitamin D from being low (see my post elsewhere in this thread), so evidently I am dealing with the other thing I mentioned, the fact that your body's ability to make vitamin D from sun exposure decreases with age. So I started taking a supplement. Would you rather I just let my vitamin D be too low no matter how much sun I got?