Alcohol
Constipation is widely mentioned as possibly being caused by alcohol. This is due to the fact that excessive alcohol consumption can increase the number of fluids lost through urine, leading to dehydration. Constipation is frequently linked to insufficient hydration, which can result from either not drinking enough water or losing too much of it through urine.
Unfortunately, there are no studies on the relationship between drinking alcohol and constipation. Additionally, some claim that following a night of drinking, they experience diarrhea rather than constipation. It's likely that different people experience different effects. Try to follow up each serving of alcohol with a glass of water or another non-alcoholic beverage in order to counteract the alcohol's potential drying and constipating effects.