Does Coffee Cause Acid Reflux? (And What to Do About It)
Does Coffee Cause Acid Reflux? (And What to Do About It)
If you've been told to give up coffee because of acid reflux, you might be relieved to know the science is more complicated than that advice suggests. Yes, coffee can trigger reflux for some people, but for many others, it doesn't. And even if it does affect you, the type of coffee and how you drink it matters more than most people realize.
If you've been told to give up coffee because of acid reflux, you might be relieved to know the science is more complicated than that advice suggests. Yes, coffee can trigger reflux for some people, but for many others, it doesn't. And even if it does affect you, the type of coffee and how you drink it matters more than most people realize.
Let's look at what the research actually shows, because the answer isn't simply "coffee is bad for GERD."

What Happens When You Drink Coffee
Coffee affects your digestive system through several mechanisms, and understanding them helps explain why responses vary so much between people.
Lower esophageal sphincter (LES) relaxation: The LES is the muscle that keeps stomach acid from backing up into your esophagus. Research published in Gastroenterology90922-1/fulltext) found that coffee, at both regular and neutralized pH, decreased LES pressure in both healthy volunteers and patients with reflux esophagitis.
Gastric acid secretion: Coffee stimulates your stomach to produce more acid. According to research from the New England Journal of Medicine, caffeine stimulates gastric acid secretion through bitter taste receptors in your stomach lining.
Multiple compounds at work: Here's something important, studies show that adding caffeine to water alone doesn't cause reflux the way coffee does. This suggests other compounds in coffee, not just caffeine, contribute to the effect.
What the Research Actually Shows
Here's where it gets interesting. The scientific evidence on coffee and GERD is genuinely mixed.
Studies showing no significant association:
A meta-analysis of 15 case-control studies found no significant association between coffee intake and GERD (odds ratio: 1.06, essentially no increased risk).
A cross-sectional study of 1,837 participants found that "drinking tea or coffee, with or without milk or sugar, was not associated with reflux symptoms or erosive esophagitis" after controlling for other variables. The actual risk factors? Hiatus hernia, H. pylori infection, gender, and BMI.
Studies showing increased risk:
The Nurses' Health Study II31380-1/fulltext) found that coffee, tea, and soda intake was associated with increased GER symptoms, with risk increasing alongside daily servings.
The bottom line from research:
A comprehensive PMC review examined 28 individual studies: 15 showed no connection, 2 showed protective effects, and 11 reported symptom aggravation. The review concluded that coffee "should not be routinely recommended to avoid" in all patients with GI symptoms.
Translation: your individual response matters more than population-level statistics.
Why Some Coffee Bothers You More Than Others
Not all coffee affects your stomach equally. The roast level, brewing method, and what you add to it all influence how your digestive system responds.
Dark Roast Is Gentler
This one has solid science behind it. A 2014 study compared dark and medium roast coffee's effects on gastric acid secretion. The findings:
Dark roast coffee contains significantly more N-Methylpyridinium (NMP) at 87 mg/L compared to medium roast at just 29 mg/L, meaning darker roasts have about three times more of this beneficial compound. NMP actually inhibits stomach acid production and forms during the roasting process, which is why darker roasts are gentler on your stomach. Dark roasts also have lower levels of chlorogenic acids and other compounds that stimulate acid secretion, making switching to dark roast one of the most evidence-backed changes you can make if coffee bothers your stomach.
Cold Brew Extracts Less Acid
Research from Scientific Reports found that while cold brew and hot brew have similar pH (both around 4.85-5.13), hot brew has significantly higher titratable acidity, meaning more total acid content.
Cold brew's 12-24 hour extraction at low temperatures pulls fewer acidic compounds from the grounds. If hot coffee triggers symptoms, cold brew is worth trying.
Brewing Method Matters
Quick extraction methods minimize acid content:
- Espresso: Short contact time, less acid extracted
- Paper filters: Trap acidic oils that metal filters let through
- Avoid over-extraction: Don't let coffee sit on grounds too long
Decaf Reduces (But Doesn't Eliminate) Reflux
A 1997 study in reflux patients found that switching to decaf reduced the time esophageal pH stayed below 4 from 17.9% to just 3.1%, a dramatic improvement.
But decaf isn't a complete solution. The New England Journal of Medicine research found that decaffeinated coffee still produced similar gastric acid responses to regular coffee, both higher than caffeine alone. Other compounds in coffee contribute to acid production regardless of caffeine content.

Practical Strategies That Actually Help
Based on the research, here's what Cleveland Clinic and other medical sources recommend:
Modifications to Try First
- Never drink coffee on an empty stomach, food buffers stomach acids
- Switch to dark roast, higher NMP, lower acid-stimulating compounds
- Try cold brew, lower titratable acidity
- Use paper filters, trap acidic oils
- Limit to 3 cups maximum, symptoms often worsen with higher intake
- Skip the cream, high-fat additions delay gastric emptying
- Consider decaf, significantly reduces (but doesn't eliminate) symptoms
What Mayo Clinic Says
Here's something that might surprise you. Mayo Clinic's guidance on GERD is clear: "A restrictive diet is usually not necessary to control symptoms."
Their recommendation: only avoid foods that *you* know worsen *your* symptoms. Don't eliminate coffee preemptively, track your individual response and make decisions based on what you actually experience.
The Personalized Approach
- Start with modifications, dark roast, cold brew, with food
- Keep a symptom diary, note what you drank and how you felt
- Try elimination if needed, if symptoms persist despite modifications
- Work with your doctor, especially if symptoms are severe or persistent
What This Means for Coffee Lovers with GERD
The research suggests most people with GERD can continue enjoying coffee with the right modifications. Complete elimination isn't necessary for everyone, and might not even help if coffee isn't actually your trigger.
That said, individual variation is real. Some people are genuinely sensitive to coffee regardless of how they prepare it. If you've tried dark roast, cold brew, drinking with food, and limiting intake, and symptoms persist, coffee may simply not work for you.
But don't give up before trying the modifications. The difference between a light roast on an empty stomach and a dark roast cold brew with breakfast can be dramatic.
How Air Roasting Fits In
At Ember, we air-roast our coffee, which produces a cleaner, smoother cup than traditional drum roasting. While air roasting isn't specifically studied for GERD, the principles that make dark roast gentler still apply: thorough, even roasting that develops NMP and reduces harsh compounds.
Combined with dark roast profiles and our lower-acid organic beans, it's a combination that many of our customers with sensitive stomachs appreciate.
Frequently Asked Questions
Is coffee bad for acid reflux?
Not universally. Meta-analyses show no significant association between coffee and GERD at the population level. Individual responses vary dramatically. Many people with reflux can enjoy coffee with modifications like dark roast, cold brew, or drinking with food.
Does decaf coffee help with acid reflux?
It helps significantly but isn't a complete solution. Research shows decaf reduces reflux symptoms substantially, but coffee contains compounds beyond caffeine that affect stomach acid production.
What's the best coffee for acid reflux?
Dark roast, cold brew, or espresso, prepared with paper filters and consumed with food. Dark roasts contain more N-methylpyridinium (NMP), which inhibits stomach acid production. Cold brew has lower total acid content.
Should I give up coffee if I have GERD?
Not necessarily. Mayo Clinic advises against blanket elimination. Try modifications first, track your symptoms, and only eliminate coffee if it's clearly a trigger for you personally.
Does the type of milk I add matter?
Yes. High-fat dairy can delay gastric emptying and worsen symptoms. If you add milk, choose low-fat or plant-based alternatives. Skip heavy creamers entirely.

The Bottom Line
Coffee and acid reflux have a complicated relationship, more complicated than "just avoid it." The research shows that most people with GERD don't need to give up coffee entirely. What matters more is *how* you drink it: roast level, brewing method, timing, and what you eat alongside it.
If coffee bothers you, try the modifications before giving up. Dark roast, cold brew, with food, through a paper filter, these changes can make a real difference. And if you've been avoiding coffee because you assumed it was off-limits, you might have more options than you thought.
At Ember, we believe coffee should work for you, not against you. Our air-roasted, organic beans are crafted for a clean, smooth cup, the kind that's easier on your system while still tasting like real coffee.