Gut Transit Time Test
Measuring how long food takes to travel from mouth to toilet is a crucial clinical metric. Normal transit time is generally between 12 and 48 hours. Based on the validated "Blue Poop" methodology (Zoe/King's College London, 2021).
How to perform the test
- Prepare a marker food. You need something that passes through undigested and is highly visible. Clinical standards use bright blue food dye (e.g., in a muffin) or a large serving (2 tablespoons) of white sesame seeds swallowed whole.
- Eat the marker. Note the exact time and date you consume it. Do not eat it over several hours; consume it in one sitting.
- Wait and observe. Proceed with your normal diet and routine. Check your stool every time you have a bowel movement.
- Log the exit. Note the time when you first see the marker (blue color or seeds) in your stool.
What your results mean
- Under 12 hours: Rapid transit. Often correlates with diarrhea, malabsorption, or hyperthyroidism.
- 14 to 48 hours: Normal transit. Indicates a healthy, diverse microbiome.
- Over 48 hours: Delayed transit. Clinically classified as slow-transit constipation, affecting microbial diversity.