We are currently making the transition away from manufactured and pesticide grown foods for many of the reasons you note here and many others.

While none of us have serious health problems and we are on the skinny side, my wife and I have been steadily losing weight and feeling better.

There are literally billions of dollars (hundreds of billions) per year invested in keeping us eating what amount to slow poisons, especially when you consider genetically modified seed ownership, industrial farming, the health care (sickness) industry, and various other intertwined topics.

There is a conspiracy
This can easily be seen by looking at some of these large mega corporations and how they go about preventing people from knowing what they are eating.

While most would consider one massive corporation as unable to conduct a conspiracy... many people within some of these corporations work together to ensure their bottom line doesn't disappear... and they all pretty much refuse to acknowledge what they are doing.