So glad to see the question raised. There is absolutely no evidence that you will be healthier or live longer eating organic. There are a lot of theories, and some of the theories have science attached to them.
But there are NO actual studies that prove, for instance, that eating organic lettuce will benefit you over eating conventional lettuce. They are chemically identical, sometimes even grown in the same fields -- but the organic one gets a special sticker with a higher price tag.
The one that really dries me nuts is GMO free. Half the junk food in the grocery store says GMO free. Most people have no idea what it means but they like to see that sticker because GMO is "bad." Reality is, GMO is developing plants via gene splicing instead of through selective breeding, which takes longer. There are lots of valid question about where gene splicing might be hazardous or bad for the environment. But there is absolutely no evidence whatsoever that eating plant species developed in a test tube will be any different from eating no-GMO.
I think the obsession with organic and no-GMO reflects several things:
1) Food has become infected with conspicuous consumption just like every other consumer product. You drive a $60,000 car, you wear a $5,000 watch, so naturally you will buy organic beef that costs $28 a pound instead of $10 a pound.
2) Ignorance of science that extends from the left to the right hand of the political spectrum. The right refuses to believe in climate change and wants to burn coal and eliminate air quality standards. The left wants to shut down nuke plants even if it means burning coal to replace them, and refuses to believe that gene splicing can improve the food supply. A pox on both of them as far as I'm concerned..
Except, by your standards about science of evidence, there is no evidence that man-made global warming is real or that any of the prescriptions (ie Kyota, Paris, IPCC) would have any meaningful impact on global temperature, but it WOULD create economic calamity that would cause misery and death on the scale climate alarmists claim will be cause by global warming.....just sayin'