We can define "natural" (from nature) quite precisely but it may not make any difference in how the word is used. That's because the connotations of "natural" are so positive.
"Middle English (in the sense ‘having a certain status by birth’): from Old French, from Latin naturalis, from natura ‘birth, nature, quality.
The phenomena of the physical world collectively, including plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations.
The basic or inherent features of something, especially when seen as characteristic of it.
Humans are natural; a computer is not natural? Petroleum is natural; what about polystyrene?
A computer is unnatural; polystyrene is unnatural. Strong negative connotations are attached to the word "unnatural". they are perverse, abnormal; obscene maybe; they don't belong here; etc.
Humans, by our nature, compound, invent, build, change and destroy things. It's normal for us; natural. That our natural compounding, inventing, building, changing, and destroying things can get out of hand, can backfire, and can threaten our own existence doesn't mean it is
unnatural. What it means is that homo sapiens sapiens is
naturally a high risk species--high risk for themselves, and high risk for many other species.
The human activities conducted in the advertising industry have, naturally, screwed up the meaning of natural; advertisers are liars by profession, and are prone to call all sorts of things "natural" that are highly contrived and loaded with man-made chemicals. So just disregard the words "nature", "natural" "cage free", "organic", "farm fresh", "grass fed", and so on when you when you see it in advertising and packaging.
Letting chickens spend all day outside, wandering around in green pastures big enough for 20,000 large birds (if not several times that many) is just not going to happen. Yes, we could employ people to collect eggs from wherever the chicken might happen to lay them, but then they would cost a lot more than $1.89 a dozen. Small flocks of chickens can be raised outside, and really small flocks can be kept inside humane chicken coops where the chickens can law their eggs in boxes. Those chickens aren't going to end up in the mass market.
Milk can be produced from pastured dairy cattle; but note, it takes
a lot of acreage to produce enough milk to supply all the markets in a metropolitan area, never mind a region. And then there is late fall, winter, and early spring when there isn't enough grass (at least in the north) to keep a few cows happy, never mind many thousand. The cows that give milk in January in Minnesota are not eating grass; they are eating hay, grain, and fermented corn stalks (which they really like).
If you want actually fresh orange juice, you usually have to make it yourself.