Yeah. I think the "natural" people aren't saying all natural things are better than all man-made things. e.g. Poison ivy tea isn't better for you than Pepsi.

But, looking at what generations of long-lived people tend to eat[1] is probably a reasonable guide to nutrition and health. Manufactured/artificial stuff simply isn't on that list since that stuff hasn't been around long enough to be part of a multi-generational study.

[1] https://www.ted.com/talks/dan_buettner_how_to_live_to_be_100...