I don't eat any vegetables as a source of significant calories.
I've always felt loosely that vegetables e.g. spinach, broccoli, etc. or things that grow above ground that aren't fruit, are not the most optimal food sources. I guess in a survival situations I could see myself eating some leaves and tree bark and drinking my own urine but outside of that I don't eat vegetables outside of seasoning.
My guiding light has always been: meat, roots, and fruits. I have a tendency to look at things from a self-sustainability point-of-view. I'm not into primal reenactment plays, but I'm into thinking about things like: Would I rather spend my primal day bent over in a field picking 1000 calories of spinach leaves or do I want to pick a potato, stab a deer, and climb a tree and call it a day? (Plus digging, killing, and climbing are all fun things to do) Of course those days I can't find anything some blades of grass will have to do but most of the time I'd prefer something a little more satisfying.
Of course I may be somewhat biased, I remember as a kid sitting at the dinner table all night refusing to eat my vegetables.
Also keep in mind that botanically bell peppers are fruits.