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| I’ve never been drawn to decaf because caffeine has always seemed to be the point of drinking coffee. A new study has me thinking twice about that. The benefits of coffee, caffeinated or not, go beyond its well-known stimulating properties — it may also improve your mood, lower stress, and reshape your gut microbiome. Below, we dig into what the science says.
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Let’s look into it,
Tim Snaith
Newsletter Editor, Healthline
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Written by Tim Snaith
May 19, 2026 • 2 min read |
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| Coffee feeds the gut (and your brain) |
| Your morning cup does far more than deliver caffeine. A new study found that both caffeinated and decaffeinated coffee can improve mood, reduce stress, and remodel your gut microbiome.
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| Researchers studied 62 adults; half were regular coffee drinkers, and half were not. The coffee group was asked to abstain for 2 weeks, then either caffeinated or decaffeinated coffee was reintroduced in a blinded trial. Both groups reported reduced stress, depression, and impulsivity, and researchers also detected increases in gut bacteria linked to digestion and immune function.
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| Coffee feeds gut microbes through polyphenols and fiber-like molecules called melanoidins. Gut bacteria ferment these into short-chain fatty acids, such as butyrate, which strengthen the gut barrier and signal to the brain via the vagus nerve. Those same polyphenols also help regulate the body’s central stress-response system.
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The study found distinct benefits depending on caffeine content. Caffeinated coffee was linked to:
- reduced anxiety
- improved attention
- lower inflammation
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Decaffeinated coffee was linked to:
- improvements in learning and memory
- increased physical activity
- better sleep
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| Three to four cups of regular coffee a day appears to be the sweet spot. More than that can disrupt sleep and undo the gains. A caffeine curfew by 2 p.m. helps protect sleep quality.
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| The real issue for health is rarely the coffee itself; it’s the other things people add to it. Flavored syrups, artificial sweeteners, and creamers loaded with gut-disrupting additives like carrageenan can reduce coffee’s benefits. Black coffee is the simplest path.
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| This new study was relatively small, only used instant coffee, and didn’t account for ethnic differences. But as lead researcher John Cryan put it, “Coffee is more than just caffeine. It’s a complex dietary factor that interacts with our gut microbes, our metabolism, and even our emotional well-being.”
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| Want to learn more about food, diets, cooking, or some other nutrition subject? Let us know at nutritionedition@healthline.com and we’ll look into it for you! (Heads up, we may use your response in an upcoming newsletter.)
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| Fun Health Benefits of Coffee |
| As well as boosting your energy, a few daily cups of coffee may also lower your risk of type 2 diabetes and depression, support weight management, and help you live a longer life. |
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| What we’re digesting |
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