You bet you can eat too much fiber!!!
There are basically 2 types of fiber --the kind that absorbs fluid and the kind that doesn't.
All meat/ seafood and dairy products do not contain any(0) fiber. Isoluble fiber are things like nuts, green beans, cauliflower, bannanas, wheat bran.
Soluble fiber includes potatoes, grains--like rice, oats, corn, --- beans, most veggies, and most fruits.
Since everyone needs fiber for their intestines to function properly (20 to 30 grams daily) ---I think it's a good , healthy think to do is take a water soluble fiber supplement like Metamucil or Citrucel. Both are safe to take daily and proceduces a gentle BM without any straining.
Things like too much nuts give me diarrhea but I really don't chew them too well and too much roughage just stimulates my intestine a little too much. So, you have to find ---what works for you---!!!