Yes and no.
Yes- simply because even though they are not real out in the real world they are because they are humanoids inside a virtual gaming type world
No- simply because they are not walking among us other humanoids or even alive on the real planet
Vitamin D is a commonly underconsumed nutrient (also Vitamin A, Vitamin E, folate, Vitamin C, calcium etc). A longterm consequence of poor diet include an increased risk of cardiovascular disease, osteoporosis and cancer.
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I think the answer would be, The Pericardium.