Why do you end up high on the Bristol stool scale when you are hungover? What is it with alcohol that interrupts the normal processes in the bowel? Even if you drink plenty of alcohol, the amount of pure alcohol never exceeds 1-2 dl or so, which is quite minuscule compared to everything else you eat and drink every day.
The stool at the top of the image of Bristol stool scale looks as separate hard lumps (Type 1), which means there's a lack of water in it, which can be due to:
- Drinking insufficient amount of water while drinking alcohol
- Eating foods low in fiber (meat, dairy products, chips, white bread, cookies, chocolate, fast food...), which is common during drinking sessions
It's fiber, mainly insoluble fiber, that absorbs water and makes the stool bulky ("normal"). Examples of foods high in insoluble fiber are whole grain bread, green leafy vegetables, legumes and fruits.
However, excessive alcohol drinking more likely results in loose stools (Type 6 or 7 in Bristol stool scale), which is a known symptom of a hangover.
It can be alcohol itself or something other in the drink that can irritate the bowel. Or it can be a mixture of drinks and foods that you are not used to or do not really go together...