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I'm also curious if there is any effect from trace amounts of insecticides, herbicides and fungicides in our water and food supply. Agriculture has experimented with many novel compounds in the past century, and I don't trust that each of these compounds was diligently studied by researchers without a conflict of interest.

It might be climate change. https://www.theguardian.com/environment/2014/may/07/climate-... details how high CO2 levels lead to food crops with more sugar and less nutrients. As a result, animals fed the same diet aren't getting the same calories as they used to.

Soil depletion and optimizing for size has also caused a drop in vitamin and mineral content

https://www.scientificamerican.com/article/soil-depletion-an...

Thought there was an air conditioning hypothesis about that?

Do you have a source for that? Super interesting...

Link to this data?