A Scary Side Effect of Drinking Too Much Caffeine, According to Science

There are many reasons to exercise restraint when it comes to drinking coffee. Sure, a cup or two may be able to give you the boost you need to get you through the workday, and it might even lend itself to some. health facilities, But drink too much You may feel anxious and irritable.

Not to mention, coffee can give you acid reflux and resentment. Turns out, it’s not just your esophagus that will thank you when you cut back on your coffee consumption—your eyes might, too. a new study, which was published in the June issue of the magazine OphthalmologyStudies have found that drinking too much coffee every day can significantly increase your chances of getting glaucoma, especially if you are already at risk for the disease.

related: 14 side effects of drinking coffee every day according to dietitian

According to the study, people who have a genetic predisposition to high eye pressure (a main factor in glaucoma) and drink more than 321 milligrams of caffeine a day (about three cups of coffee) are more likely to develop glaucoma. is. In fact, the prevalence of glaucoma was nearly four times higher in those who drank the least amount of caffeine and were in the lowest genetic risk score group. Granted, you probably don’t know whether you have high intraocular pressure (IOP), so it may be best to exercise caution anyway.


Study co-authors said, “If you suffer from glaucoma that is not stable on treatment, or are someone with a strong family history of glaucoma, who want to reduce your risk of developing this disease, I recommend a large dose.” I would advise to avoid consuming caffeine.” Author Anthony Khawaja, MD, PhD, Associate Professor of Ophthalmology at the University College London (UCL) Institute of Ophthalmology, explains Eat This, Not That!

Only those who drink excessive amounts of coffee and who are predisposed to high IOP are at increased risk, said corresponding study author Louis R. Pasquale, MD, FARVO, deputy chair of ophthalmology research for the Mount Sinai Health System. Reassuring us that, “Overall, coffee is safe to consume.”

In general, experts recommend sticking to 400 milligrams of caffeine each day anyway, which is between three and five, eight-ounce cups. So, if you have reason to be concerned about your glaucoma risk, consider drinking just two and three cups daily—it’ll protect you from other unpleasant side effects, too.

“Given that we only saw an association with increased risk among those with the highest consumption, I think that small to moderate consumption is probably reasonable for everyone in terms of glaucoma risk,” says Khawaja.

For more information, be sure to visit A major side effect of drinking coffee from a to-go cup, according to experts.

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