Our expert says:
I'm not sure of a deficiency that would cause this. I've given it some thought, and unless I'm missing something, it's unlikely to be a lack of anything. The only two occasions where I have heard of a yellow colour in the skin is when someone has jaundice (a liver disease, which seems unlikely given that he's running and otherwise apparently healthy), or it's too much Vitamin A/Beta Carotene in the diet. That happens when people overdo it on vitamin supplements, or in people who eat too much of the foods that contain beta-carotene, like carrots. Could that be the reason?
Other than this, I'm a bit at a loss, if my answer is not even close to being right, let me know and I'll dig a bit more.
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