I buy all my vegetables at the Central Farmer´s Market and thus, there are no insecticides used on these products.
I do not peel: Apples, Aubergine (Eggplant), Cucumbers, Carrots, Potatoes (I bake), Beetroot (I roast in oven).
I do peel Cardoon always & peel Celery if making tuna fish salad or chicken salad or other shell fish salads however, if just using as a cruditie, I do not peel it.
IN NON PEELED: The health benefits and anti oxidants are enormous.
I do peel & de - seed red ripe tomatoes when doing a sauce for pasta or an Andalusian gazpacho or a French Gaspacho.
For salads, I do not peel or de - seed tomatoes.
Interesting post ..
Have a lovely weekend.