It's not that we need to seek all kinds of specific foodstuffs, it's that nutritional science has progressed considerably and we now have access to a lot of plants with very interesting often unique properties coming from all over the world. It makes sense to profit from the best modern nutrition and phytotherapy have to offer.
Do you realise that scientists or "wannabe scientists" have said this kind of thing for decades?
It's not a new concept that "current research" is confused with fact - and people are eating it up because they read it in an article or watch some person of authority speak on TV about it.
Difference is that, these days, it's google, wiki and youtube. The rest is the same - and people have different levels of what it takes to "believe" in something. That doesn't make it any more solid as fact, though.
Now, I'm not saying it CAN'T be solid - it's just that this kind of knowledge is fickle - and there's a potentially ridiculous amount of biased interest involved when producing research. We're way, way, WAY past integrity when it comes to profit in these fields, unfortunately. SOME of it may be completely void of bias - and totally "pure" and insightful research. It's that we have no way of knowing, unless we're part of the process and we know who did what first and who followed it up. It's pretty much impossible.
That's what makes it about faith.
You're not exactly the first person naive enough to consider our current level of "knowledge" so infallible as to structure your life around it. You're not the first to consider himself capable of sorting shit from cream either.
Now, there's nothing wrong with faith in this kind of "science" - I just don't think blind faith to such a degree is a safe bet.
I'm not trying to stand in your way though, and if you believe your excessively exclusive way of consuming food is of some use to you, that's great.
I doubt you'll get sick or whatever, as I happen to believe our bodies are remarkably adaptive and that we can take all kinds of "unhealthy" punishment in some moderation.
But there's no denying the impact in terms of time and effort just to pretend to be aware of what you're putting into your mouth. I can't, personally, see how that's possibly worth it - but that's me.
If you want a much easier and slightly reliable way of establishing healthy food, look at where people live long lives correlated with what they consume. What is it these days, Japan? Something like that. Just eat fish, vegetables and rice or whatever, and you might get a few more years. It's not that hard, really.