And don't forget about foods containing Olestra. They can produce very orange stools.
Orange bowel movements can be caused by various things, most benign.
First, there are foods which can cause orange stools:
* Any food with artificial yellow or orange coloring
* Carrots
* Cilantro
* Collard greens
* Fresh thyme
* Kale
* Sweet potatoes
* Spinach
* Turnip greens
* Winter squash
Second, there is the possibility of lacking bile salts, either not enough being absorbed into the digesting food or not enough exposure to it. This can be caused by issues within the gallbladder (stones or polyps), or can be an IBS, short bowel syndrome, or diarrhea issue.
Finally, if you're taking any medications of supplements with beta carotene (sometimes found with vitamin A) or aluminum hydroxide (antacids) then that too can be causing the issue.
Go see a doctor about this, and take note of any dietary changes. Request a gallbladder ultrasound to make sure you don't have stones, polyps, or anything more serious. Generally there's not much to worry about in this front, but it's best to be on alert.