Yours is an idiotic assumption.
People working in the sun all day make way more vitamin d than they’d ever take from bottled supplements and they are not OD’ing from too much vitamin d. There is no epidemic of sunbathers or groundskeepers having vitamin d overdoses due to high sun exposures. Never in recorded history.
Most people are deficient in vitamin d. In the winter that deficiency increases. As you age, your body can’t utilize it as well as when you’re young, so you need more.
Exactly. The older you get, the more important to get your D3 levels checked and to take some D3 supplements. Minimum 5000 units daily in my book. Older people are fools to just rely on sunlight for their D3. As you say, they become less able to “convert” sunlight to D3 on the skin.
Obese people should be taking massive D3 supplementation due to the fat soluble D3 vitamin getting stored /locked up in their blubber. Meaning their D3 cannot be mobilized and sent where it is needed. Such as warding off a freakin virus!
That is because there is a huge difference between getting D from sunlight as opposed to supplements. One cannot OD from sun exposure, which I chalk up to God’s incredible design. However, it is possible (although one would have to take a lot) to get too much vitamin D from supplements.
It was not an assumption on my part, idiotic or otherwise.