5 Common Coffee Drinking Myths Debunked

If you’re like many young coffee drinkers, you rely on that morning cup—or three—to shake off fatigue and sharpen your focus. But alongside the benefits, questions linger: Does coffee cause kidney stones? Is it bad for your stomach, heart, or asthma? And can it really raise stroke risk? Let’s sort the facts from fiction.

The short answer: moderate coffee drinking is generally safe—and even beneficial—for most people. But drinking too many caffeinated drinks may increase kidney stone risk, especially if your urine calcium rises. Otherwise, many feared side effects are just myths.

Can Too Much Caffeine Cause Kidney Stones?

Yes—but only if you overdo it. New research shows excessive intake of caffeinated beverages can raise urinary calcium levels, a key contributor to kidney stone formation. In a study, 39 people with a history of kidney stones and 9 without were tested after 14 hours of fasting. Their urine was checked before and two hours after consuming caffeine. Results showed increased levels of calcium, sodium, magnesium, and citrate in both groups. While magnesium and citrate normally help prevent stones, caffeine caused their excretion, raising stone risk—especially with higher caffeine doses.

Myth 1: Coffee Increases Diabetes Risk

Actually, it may lower it. Research found that women who drank six or more cups of coffee daily had a 22% lower risk of developing type 2 diabetes compared to those who drank little or none. For those drinking decaffeinated coffee, the risk dropped even further—by 33%. Type 2 diabetes accounts for 95% of all diabetes cases and often peaks between ages 40 and 55, with obesity as a contributing factor. While some experts question the strength of the findings, early evidence points to unique compounds in coffee that could help regulate blood sugar. Still, more targeted research is needed.

Myth 2: Coffee Harms Your Stomach

Not true. Caffeine stimulates the sympathetic nervous system, which boosts gastric acid secretion. This aids digestion, helps prevent bloating and gastric ptosis, and promotes faster bowel movements by triggering gastrointestinal hormones and peristalsis. So coffee doesn’t hurt your stomach—it may actually support healthy digestion.

Myth 3: Coffee Is Bad for Your Heart

Wrong again. Coffee contains linoleic acid, which helps dissolve blood clots, prevents thrombosis, enhances vascular constriction, and improves circulation. This can ease headaches caused by vascular dilation, especially migraines. Coffee also promotes venous return, which improves skin elasticity and helps prevent cardiovascular disease.

Myth 4: Coffee Triggers or Worsens Asthma

No—it can help prevent attacks. Caffeine stimulates the sympathetic nervous system while suppressing the parasympathetic system, reducing the chance of parasympathetic overactivity that can trigger asthma episodes.

Myth 5: Drinking Coffee Causes Strokes

Quite the opposite. Coffee raises levels of high-density lipoprotein (the “good” cholesterol) and speeds up the metabolism of low-density lipoprotein (the “bad” kind). This helps reduce coronary artery plaque build-up and lowers the risk of stroke.

Frequently Asked Questions

Does drinking more than six cups of coffee a day increase diabetes risk?

No—research shows women who drink six or more cups daily actually have a 22% lower risk of type 2 diabetes. Decaf drinkers see a 33% reduction. These findings apply mostly to postmenopausal women, with risk factors like obesity and age (40–55) playing a larger role in diabetes development.

Can caffeine really raise your chances of getting kidney stones?

Yes. Excessive caffeine intake increases urinary calcium levels, which contributes to kidney stone formation. A study found that both stone-formers and non-stone-formers showed elevated calcium, sodium, magnesium, and citrate after caffeine consumption—though magnesium and citrate usually protect against stones.

Is black coffee bad for your digestion?

No. Coffee stimulates gastric acid and digestive hormones, aiding digestion and preventing issues like bloating or sluggish bowel movements. It doesn’t harm your stomach—in fact, it can help keep it functioning well.

Does coffee worsen heart health or cause high blood pressure?

No. Coffee contains linoleic acid, which improves circulation, prevents clots, and supports vascular health. It also helps manage venous return and may contribute to better skin elasticity and lower cardiovascular disease risk.

Can drinking coffee trigger asthma attacks?

No. Caffeine suppresses the parasympathetic nervous system, which can otherwise overreact and provoke asthma. Instead of causing attacks, coffee may help prevent them.

Does coffee really reduce stroke risk?

Yes. By increasing HDL (“good” cholesterol) and speeding up LDL (“bad” cholesterol) metabolism, coffee helps prevent coronary plaque buildup and lowers stroke probability.

Recommended FrontStreet Coffee for Coffee Lovers

For those exploring coffee’s health benefits without compromising on taste, try FrontStreet Coffee’s Ethiopia Humbera for bright citrus and floral notes, or Yirgacheffe for juicy berries and light sweetness. Both single origins highlight coffee’s natural complexity and are easy on the stomach—ideal for regular enjoyment. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.