June 29, 2025, 6:01 am | Read time: 4 minutes
Many people begin their day with a hot cup of coffee, not just to wake up, but because their body responds to it. For some, it noticeably stimulates digestion. It’s no secret that coffee affects the intestines, but what does this mean for those with constipation? The temptation to use this effect intentionally is strong. However, doing so can pose health risks.
Coffee is a staple of daily life worldwide and much more than just a stimulating beverage. Its numerous components have various effects on the body, from enhancing concentration to aiding digestion. The latter makes it particularly interesting for people with sluggish digestion. However, experts advise caution with long-term use.
Overview
Coffee Can Aid Digestion – with Limitations
It is known that coffee can stimulate bowel activity and thus promote evacuation. Those suffering from constipation might be tempted to use this effect deliberately. In certain cases, this can indeed work.
However, using it as a permanent “home remedy” is problematic. “Because it can lead to a habituation effect, causing the effect to diminish,” warns “Apotheken Umschau” (Issue B 6/25). Additionally, there is a risk that coffee may irritate the stomach lining in sensitive individuals, potentially leading to heartburn or even diarrhea.
Why Does Coffee Affect Digestion?
The effect on digestion is not solely due to caffeine. In addition to bioactive substances like chlorogenic acids and coffee oils, the hormone gastrin plays a role, which is released in greater amounts through coffee consumption and promotes bowel activity.
However, not everyone reacts the same: Personal sensitivity to caffeine, gut flora, and individual habits determine how strongly it works. Some feel little change, while for others, just a few sips have an effect.12
Improving Tolerance–Here’s How
If you find that coffee affects your digestion too strongly, you can take specific measures. A small snack before drinking coffee can protect the stomach lining. Milder roasts are also usually more digestible.
A Complex Beverage with Many Components
Coffee contains more than just caffeine—its composition is extremely diverse. The main components include carbohydrates (about 35 percent), lipids, and proteins. Chlorogenic acid is the most prevalent at about 2.5 percent. It not only shapes the taste but can also cause stomach problems in sensitive individuals.
Additionally, coffee provides about four percent minerals such as potassium, magnesium, calcium, and phosphorus. B vitamins–including B2, B3, B6, and pantothenic acid–are also present. Vitamin B3, or niacin, supports metabolism and cell regeneration.3
Another Health Benefit of Coffee
Coffee also contains alkaloids, primarily caffeine. It makes up about 1.3 percent of an Arabica bean and stimulates the central nervous system. It also contains diterpenes—natural substances that can increase cholesterol levels with excessive consumption. This mainly affects unfiltered coffee preparations.
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How Much Caffeine Is Still Safe?
According to “Apotheken Umschau,” the European Food Safety Authority (EFSA) considers a single dose of up to 200 milligrams of caffeine and a daily intake of up to 400 milligrams safe for healthy adults. For pregnant and breastfeeding women, the recommended upper limit is 200 milligrams of caffeine per day. Children and adolescents should consume no more than three milligrams of caffeine per kilogram of body weight daily.4
Additionally, hidden sources of caffeine such as energy drinks, chocolate, or cola should be included in the daily tally.
When Should You See a Doctor?
“Apotheken Umschau” recommends seeking medical advice or consulting a pharmacist if constipation persists. Possible causes could include certain medications, such as strong painkillers or iron supplements. In such cases, coffee should not be used independently to stimulate digestion; other measures should be taken.