H Correia et al, 2020. Effects of non-caffeinated coffee substitute on functional dyspepsia, Clinical Nutrition ESPEN, published online.

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SUMMARY

Background: 
Functional dyspepsia (FD) is a debilitating functional gastrointestinal disorder characterized by early satiety, post-prandial fullness or epigastric pain related to meals. FD is diagnosed when organic etiology for the symptoms is not identified. It is widely believed that FD may be linked to the consumption of certain foods. In a clinical setting, it is often recommended that coffee be avoided in patients with FD. The lack of clinical research on non-caffeinated coffee substitute’s effects on functional dyspepsia (FD) prompted the need to explore the topic clinically.

Aim: 
The purpose of this study is to investigate the effect of drinking non-caffeinated coffee substitute on FD symptoms in order to determine if recommending a non-caffeinated coffee substitute in patients with pre-existing FD relieves the patient’s symptoms.

Methods: 
This is a quantitative study with 51 patients diagnosed with FD. A patient-reported outcomes (PRO) instrument called the Gastrointestinal Symptom Rating Scale (GSRS) was used to determine the results. After the participants enrolled, they completed the pre-GSRS questionnaire. The participants were instructed to stop their daily consumption of caffeinated and/or decaffeinated coffee and replace it with the non-caffeinated coffee substitute. After one month, the participants returned to the physician’s office to complete a post intervention GSRS questionnaire.

Results:  
The Wilcoxon Signed Rank test was used to test for significant change across time. Our study showed a statistically significant decrease from pre-intervention to post-intervention for functional dyspepsia symptoms, (3.67–1.00), p < 0.001.

Conclusion:
To our knowledge, this study is the first to evaluate whether removing coffee from a person’s diet and replacing it with a non-caffeinated coffee substitute would result in the improvement of functional dyspepsia symptoms. Our results indicate that replacing a caffeinated or decaffeinated coffee with a non-caffeinated coffee substitute decreases FD symptoms.

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