- Several studies into gastrointestinal conditions such as dyspepsia1-5, gastro oesophageal reflux disease6-15, peptic ulcers16,17, and gastritis17 suggests that coffee is not associated with the development of these disorders
- Research also suggests that coffee consumption does not worsen symptoms in those who suffer these conditions when confounding factors, such as body mass index (BMI) and smoking status, are controlled1,7,9,12
- In the small intestine, studies suggest that coffee consumption does not increase the risk of duodenal ulcers18,19 and has no effect on fluid balance in this location20,21
- Research also suggests that there is no association between coffee consumption and disorders of the large intestine, such as diarrhoea20-22, or irritable bowel syndrome2,23,24
- Research on organs associated with the gastro intestinal tract suggests that coffee consumption is associated with a reduced risk of gallbladder disease25-28, and with lower incidence and rates of progression of liver disease
- In its 2016 report, the International Agency for Research on Cancer (IARC) concluded that there is inadequate research to suggest any link between coffee consumption and cancer of the oral cavity, pharynx, larynx, stomach, oesophagus, or colorectum30. The review also suggests that coffee drinking is associated with a reduced occurrence of liver cancer30
- Data reviewed by IARC also suggests that there is no association between coffee consumption and increased risk of pancreatic cancer30. However, IARC classified beverages consumed at very high temperatures, defined as drinks over 65°C, as “probably carcinogenic to the human oesophagus”30
The content in this overview was last edited in May 2018. Papers in the research section and further resources are added regularly.