Drinking coffee on an empty stomach in the morning can stimulate the secretion of stomach acid, which may aid digestion for some people. However, it may also cause acidity, heartburn, or diarrhea in individuals who are more sensitive.
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Coffee also accelerates colon contractions and bowel movements through the gastrocolic reflex. While it may help increase gut microbiome diversity and beneficial bacteria, it is generally recommended to consume coffee with or after food to avoid discomfort.
How Coffee Affects Digestion
Coffee stimulates the release of gastrin and hydrochloric acid, both of which play a role in breaking down food in the stomach. It also encourages the release of cholecystokinin (CCK), a hormone that promotes bile production, which helps digest fats in the digestive system.
Stomach Irritation (When Consumed on an Empty Stomach)
Drinking coffee without eating first may increase hydrochloric acid production. Without food to digest, this can lead to heartburn, bloating, nausea, or gastritis.
Although large-scale studies suggest coffee does not directly cause acid reflux, it may worsen symptoms in some individuals, possibly because it relaxes the muscle that helps keep stomach acid contained. Those prone to heartburn may benefit from reducing coffee intake or avoiding it altogether.
Coffee and Medications
Research suggests that drinking coffee while taking certain medications may affect how the body absorbs and distributes them.
The caffeine in coffee may reduce the effectiveness of some medications, including:
Diabetes medications
Antidepressants such as escitalopram
Methotrexate
Thyroid medications
If you need to take medication in the morning, it is advisable to wait one to two hours after drinking coffee or any caffeinated beverage before taking your medicine.
If you are unsure about interactions between coffee and your medication, consult your doctor.
Digestive Benefits
Coffee stimulates stomach acid, bile, and hormones such as gastrin, which can speed up digestion and enhance colon contractions.
Natural Laxative Effect
Coffee is considered a strong trigger of the gastrocolic reflex, increasing bowel activity and sometimes causing a bowel movement within minutes, which may help relieve constipation.
However, faster digestion is not beneficial for everyone. If you already experience loose stools or diarrhea, temporarily avoiding coffee may help improve symptoms.
Coffee appears to stimulate colon activity more than decaffeinated coffee or water. Some findings suggest regular coffee may stimulate the colon 23% more than decaf coffee and 60% more than water, and may be linked to a lower risk of chronic constipation.
Coffee and Gut Bacteria
Although this is still an emerging field of research, coffee consumption appears to support greater diversity in gut microbiota.
The polyphenols in coffee may positively influence gut bacteria, particularly Bifidobacteria, often regarded as beneficial bacteria. Healthy gut microbes help protect against infection, support immune function, and contribute to healthy digestion.
Coffee Is Not a Substitute for a Healthy Diet
Many of coffee’s health benefits may be related to how gut microbes metabolize its beneficial polyphenols. However, replacing nutritious meals with coffee is not beneficial, as maintaining healthy gut bacteria requires a diverse intake of dietary fiber.
Tips for Healthy Morning Coffee Consumption
Moderate intake of 1–3 cups of coffee per day may support digestion and beneficial gut bacteria. However, excessive consumption or pre-existing digestive issues may do more harm than good.
Helpful tips:
Eat first: Avoid drinking coffee on an empty stomach to reduce acidity and irritation.
Choose lower-acid coffee: If you are sensitive to acidity, opt for low-acid varieties or coffee with milk (dairy or plant-based).
Stay hydrated and drink in moderation: Limit intake to 3–5 cups per day or less to avoid excessive laxative effects, and drink water before coffee to rehydrate after sleep.
