Anything which hasn’t been meddled with by humans yet could be called natural. But everything gets impact by human activities. The remotest place on the planet would have had some impact of things happening elsewhere. El nino and what not!
When it comes to food, normally we wouldn’t check ingredients. But there’s a reason that there is a requirement to show the ingredients on the packaging. So as one grows older (and pants become tighter), we start reading what makes the thing so tasty: generally added flavours, emulsifiers, refined sugar. But then what’s actually natural? Potato, tomato, chillies weren’t naturally available anywhere except few countries. Now we have them everywhere, GM or not.
It is indeed difficult to find natural things. So what can be done? What Tradeoffs between luxury or taste, economic value or ease can be made?
I guess, the expert answer as per me is this: As long as you can tolerate, enjoy what you think is natural (or what law allows). Later, everyone takes support of unnatural things like medicine, technology, and luck. Enjoy.