One concrete data point for the thread. Cheap and worth having: ferritin, B12, vitamin D. Everything else on the deficiency list is adequately covered by a standard multivitamin at ordinary doses.
One thing that is still open after andrew_nyc’s answer:
Which deficiencies actually show up when intake drops this far, and which are worth testing rather than supplementing blind?
BiostatsBrad said:Cheap and worth having: ferritin, B12, vitamin D.
There is a second half to this that has not been said yet. The mechanism and the magnitude are separate questions. Agreeing that something happens says nothing about whether it happens enough to act on.
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View ResultsClosing the loop on my own question.
Update: the thing I was blaming turned out not to be the cause. Leaving the original post as written rather than editing it, so the mistake stays visible for whoever searches this next.
Dr.Martinez said:The mechanism and the magnitude are separate questions.
Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.
Worth separating that from micronutrient cover, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.