How often you go to the bathroom may have less to do with routine and more to do with biology than previously thought. New research suggests that gut motility — the speed at which food moves through the digestive tract — may be closely tied to how the body processes a single vitamin.
In a large genetic analysis involving hundreds of thousands of people, researchers identified multiple gene variants linked to vitamin B1 metabolism that were associated with stool frequency. Follow-up data showed that people with higher dietary intake of this vitamin tended to have different digestive patterns, suggesting it may help regulate the gut’s internal pacing alongside known systems such as nerve signaling and bile acids.
The findings point to a broader role for vitamin B1 in digestive health, beyond its established function in energy metabolism. While researchers stress that more studies are needed, the results highlight how subtle nutrient pathways may influence everyday bodily functions — and why digestion may be more genetically and nutritionally driven than once assumed.
SOURCE:
ScienceAlert, January 27, 2026