While i think peeling is wasteful, this is not true: https://www.nutritionletter.tufts.edu/general-nutrition/does-peeling-carrots-remove-nutrients/

80% of the vitamins are not in the skin. There are exceptions where the skin of some fruits and vegetables are higher in a particular vitamin(s), like for instance potato skins are highest in iron or something like that, but it is untrue that the majority of nutrition is in the skins of these foods and discarding or peeling them removes “80%” of the nutritional value of the food.

I don't want to grind earth, sand and/or dung on my teeth though.