jimrandomh comments on Quantified Health Prize Deadline Extended - Less Wrong
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Nope. This comes from the fact that when you do proper studies about overdosing (which is what you do with needless supplementation) various micronutrients you find that it is at best useless and at worst harmful. Then I added my own spin on the cause of it rather than listing studies for each chemical because I can't be bothered to write a meta study.
Then you should eat at least some fresh food. If you are a normal American or European you should probably also eat more fruit, but you don't need to worry about your vitamin C intake. (Unless you take more than ten times RDI ie one pill per day, in which case you should decrease your intake of vitamin C and still eat more fruit)
Edit: Based on jimrandomh's claim below I think that I should clarify that by "needless supplementation" I mean any supplementation done when it has not been demonstrated (eg with blood work at a clinic) that you have a deficiency of that particular mineral.
You slipped your conclusion into a premise, when you called it "needless supplementation". That's not what we're talking about; the goal here is to find which compounds, specifically, do need to be supplemented. And I think it ought to go without saying that if you overdose on anything harmful, you're doing it wrong.
Basically, nutrition and supplementation is really complex. If you try to take supplements without engaging with that complexity then you might get hurt; but if you do engage the complexity, you can achieve great benefits.
Surely the question is whether you can reduce the uncertainty enough (about nutrition in general and your own metabolism in particular) that it starts beating "eat like a sane person"?