Consuming Too Many Carbonated Drinks May Increase Stroke Risk by 22%, According to New Study

It’s no secret that what you eat affects your health, but your beverage choices can also make an impact. A recent study from the University of Galway, in collaboration with McMaster University and an international network of stroke researchers, has revealed alarming findings linking frequent consumption of fizzy drinks to increased stroke risk. These findings are timely, considering stroke remains a leading cause of death globally. Read on to learn more about the study’s findings and what they may mean for your long-term health.

What the Study Found 

The findings stem from two analyses within the INTERSTROKE research project, one of the largest studies examining stroke risk factors involving nearly 27,000 participants from 27 countries. The first analysis focused on the effects of fizzy drinks and fruit juices.

For the first analysis, researchers defined carbonated beverages (aka fizzy drinks) as "cola, non-cola beverages (sweetened and unsweetened), tonic water or instant iced tea." It's important to note that there wasn't data for carbonated beverages separated by sweetener content (unsweetened, sugar sweetened, artificially sweetened), so sugar-free drinks like seltzer were grouped together with soda.

Regular consumption of fizzy drinks was associated with a 22% increased stroke risk. This risk rose significantly for those who consumed two or more fizzy drinks daily. 

Additionally, the researchers found that drinking store-bought fruit juices containing concentrates, added sugars and preservatives can offset any benefits typically associated with fresh fruit and may increase stroke risk. The research team found that fruit juice consumption was linked to a staggering 37% increase in the risk of hemorrhagic strokes (bleeding in the brain). For those consuming two fruit juice drinks per day, the risk tripled.

Lead researcher Andrew Smyth, a professor of clinical epidemiology at the University of Galway and consultant physician at Galway University Hospitals, said, “Not all fruit drinks are created equal—freshly squeezed fruit juices are most likely to bring benefits, but fruit drinks made from concentrates, with lots of added sugars and preservatives, may be harmful. Our research also shows that the chance of stroke increases the more often someone consumes fizzy drinks.”

The analysis also revealed that the link between fizzy drinks and stroke risk was particularly evident in specific regions, such as Eastern and Central Europe, the Middle East, Africa and South America. And women, in particular, showed a greater increase in stroke risk associated with fruit juice intake.

Interestingly, tea consumption was associated with a reduced stroke risk. Drinking three to four cups of black tea daily correlated with a 29% lower chance of stroke, while three to four cups of green tea resulted in a 27% lower risk.

Tips for Reducing Stroke Risk

To help lower your stroke risk, consider the following:

• Limit fizzy drinks: Reduce your intake of sugary and artificially sweetened carbonated beverages. Instead, opt for water, herbal teas or infused water with fruits for added flavor.
• Be mindful with fruit juices: If you enjoy fruit juices, choose 100% pure juices without added sugars or preservatives and consume them in moderation.
• Stay hydrated: Ensure you drink plenty of water throughout the day. Staying hydrated is essential for several bodily functions and can support cardiovascular health.

The Bottom Line 

Recent findings from an INTERSTROKE study highlight a concerning connection between high consumption of carbonated beverages and an increased stroke risk. Even though the study did not separate sweetened versus unsweetened carbonated beverages for the analysis, limiting added sugar in your diet can promote heart health and overall health. As with all things, having a balanced approach to what you drink may promote long-term health while still allowing you to enjoy the drinks you love. If you have questions or concerns about your dietary habits and stroke risk, speak with your health care provider or a registered dietitian to learn more.