Fair enough.
Some of both, more nutrients, less toxins like cadmium. See article at the bottom.
Im not a chemist ,nor nutritionist, so I cant give you a scientific answer, but Im sure there are studies available, Ill take a look. Pert my basic understanding, nitrogen makes a lot of foliage, a big plant, but doesnt convey to the plant many of the essential minerals and other substances that our body needs.
I can only give my personal experience.
I grew up on a farm and most of what we ate was raised at home. Not all 100% organic, but from good rich soil, little fertilizer was used. I rarely got sick, always felt nourished. Then after I left home I didnt eat so well, lots of fast and canned foods. so Id eat more trying to satisfy that need. I got sick and just never felt as good.
A number of years ago I started working my way back to organic foods and that began to reverse. What I find is that I need to eat less and feel more full and satisfied with less. I rarely get sick and have a lot more energy, even at 72. Thats the only real change that would account for it. On a slightly different note, I do find as I age that I need more protein. As I understand it your body doesnt convert things as well.
Thats my take, and I can only speak of that which I personally experienced. Im sure some here will scorn that, saying its only 'subjective' and not scientifically verifiable. I could care less, it works for me. For someone to say otherwise, is like someone saying "I dont feel well today." and another sayin "Yes you do, its all subjective." To me thats the height of arrogance. Im sure those individuals know far more than the Mayo Clinic, see below.