Molecules: You'd better learn to live with them.
Whether it is constipation or diarrhea, irregularities in bowel movements on some level all relate to the balance of fluid in the intestines. Fiber doesn't just add bulk to feces, it holds onto water. If you go all Linus Pauling and take way too much vitamin C, you'll get diarrhea - the prodigous amount of dry water-loving solute you are ingesting will draw water into the intestines.
Many laxatives, such as sodium picosulfate, work the same way. Water follows ions, and this doubly-charged molecule draws water into the intestines, with the result of inducing a bowel movement.
If you are unsure of where your feces line up, the helpful Bristol Stool Chart may prove instructive.
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Comments
Although I've been a fan of the Bristol chart for a while, unfortunately it just doesn't match the detail of the Kings Stool Chart (pdf warning). Superior in every motion.
Posted by: coracle | February 21, 2008 6:42 PM
That's actually the funniest medical chart I may have ever read!
Posted by: Jeff | March 5, 2008 12:37 PM
"Type 4: Like a sausage or snake. Smooth and soft"
Instead of the boring "I am regular now" TV ads: Cheerful ladies in a bingo hall sharing the news: "It's been the type 4. Like a sausage or snake..."
Posted by: milkshake | March 6, 2008 2:51 AM