Not only that, but even if you can afford (both in time and money) to shop for honest, nutritional alternatives, how many people are really going to spend a significant amount of their time seeking out and acquiring these alternatives?
The OP talks about finding local sources of coffee and eggs, but many people would have no idea of where to get those, nor have any means of verifying that they were really what they claimed and not fraudulent.
As a consumer, I have no way of knowing if, for instance, the people hawking food at my local farmer's market (which I'm lucky enough to live within a convenient distance of) are really source their food locally or just pretend to. I have no means of verifying whether their food is really "organic", or is merely sold as such.
To take an example, the adulteration of "raw", "organic" honey with fillers like corn syrup is a serious problem.[1][2] An individual consumer has virtually no means at their disposal to determine which honey is genuine, short of becoming a beekeeper themselves or having a trusted beekeper friend, which is (I would venture to guess) the case for approximately 0% of the population.
The same goes for pretty much every other product. In aggregate, for all of the products a typical consumer buys, this can not be solved at an individual level.
[1] - https://news.ycombinator.com/item?id=22518291
[2] - https://www.vice.com/en_us/article/884kq4/your-fancy-honey-m...