Bowel transit time refers to how long it takes for the food to move from the mouth to the anus.
This article discusses the medical test used to determine bowel transit time.
You will be asked to swallow two gelatin capsules filled with carmine red or another food dye. You take the special capsules with a meal.
Afterwards, you observe your bowel movements and write down how long it takes for the colored dye to first appear. You'll also need to note how long it...Read more