but just because it would be interesting doesn't make it true.
For most part actually being true does very little to convince people that it is true either. Fortunately we are reasonably robust when it comes to adverse conditions. We can survive with sub-optimal nutrition - our perfomance just degrades gracefully. A few IQ points here, some osteoperosis there, maybe some mood imbalance or fatigue. For most it falls short of being a blatantly diagnosable condition but that doesn't make it optimal. We can also get by without exercise while subjecting ourselves to chronic stressors, being sleep deprived, smoking and binge drinking. I don't recommend those either.
The wikipedia link you provided makes it clear that micronutrient deficiency is a serious problem in the developing world but I could not see any factual support in that link for the claim that micronutrients in general have an interesting dose/response curve, or that micronutrient deficiency in the developed world is any kind of problem for the majority of people. You might want to edit that link to reflect the fact that it does not support the claim "actually being true".
There is some expert support for your view but there is also excellent rea...