The bottom line here, is that there IS NO BOTTOM LINE.
What one crohnie can get away with has no bearing whatsoever on what another crohnie can get away with. If I'm in remission, I can eat ANYTHING. Salads, tomatoes, apples WITH skins... none of it is bothersome or hurtful to me.
When I'm flairing a little bit - I can't tolerate anything "natural" without it being blended (smoothie, juice, etc.). But, once I'm back up to par - I go back to eating my salads again without trouble.
As others have stated, it is COMPLETELY individual. ANd it is VERY important to keep a food journal when you're delving in to new territory. Decide what food you want to try... say apples. Try drinking apple juice first. Wait and see if it upsets you. If not, try blending a peeled apple with a little bit of juice to make a smoothie. Eat that smoothie, and then lay off for a couple of days. Make sure there are no "delayed" affects. If not, try eating one peeled without the blender. Again, just do it once, and wait a few days to see if there are any negative consequences. It's slow, and tedious, but it's the only way to discover what YOU as an individual can tolerate.
Through the years of self-experimenting, and reading, and researching - the one very important thing that I've discovered is that this is MY body. And since my body has this disease, I have to treat it as an ongoing experiment, because no one really has any answers about this disease. The thought of being denied fruits and veggies for the rest of my life was absolutely unacceptable. So, I found a gradual way to experiment and see what my body really would tolerate. When I told my doc that I was eating my own home-grown tomatoes every day and doing fine his jaw almost hit the floor. Point is - anybody who thinks they have it figured out - they have it figured out for themselves, not for you. YOU need to figure YOUR body out.