Comment by nuancebydefault

Ultra processed foods are usually unhealthy because of the relative high amount of additives that are 'needed' to proloung their conservation. Those additives can be natural, like sugar and salt, but still are unhealthy in large quantities. Also heating, which can be seen as natural, can proloung conservation, but often have the side effect of chemical reactions into unhealthy molecules.

The better alternative is to eat non processed food, but only early after reaping. Otherwise the natural (!) chemical reactions like oxidation makes them unhealthy.

The plants in my garden are all natural. I don't use chemicals. Still half of them contain poison like blueacid.

Just to say, natural doesn't mean healthy. Processed doesn't mean unhealthy.