If you experience explosive diarrhea, first ask yourself if your diet may be responsible. Any increase in fruit, vegetable, bran cereal or whole grain consumption is putting more indigestible fiber into your gut, which acts to soften stool and speed the transit of fecal matter through the intestines. Excessive fiber, or a drastic increase in fiber intake, can cause gas and diarrhea, including explosive diarrhea. Fruits, vegetables and whole grains also contain some poorly digested starches and sugars