I asked my Doctor this same question years ago and he simply stated that this is a key factor in whether you have too much fat in your diet. Too much, and they float.
Runny foods and water are mainstays of our diet when we are ill. Imbalances in diet, along w/ bacterial or viral infections panic our immune systems into action. Elimination of loose formless stools...
Yes. Coffee contains a lot of caffeine (depending on brand and brewing method). This causes the intestines to become stimulated, and increased movement of the intestines causes a bowel movement.