Drinking too Many Cups of Coffee could put your Heart Health at Risk

 

A study found that people who consumed more than 400 mg of caffeine (which amounts of about four cups of coffee, two energy drinks, or 10 cans of soda) most days had a higher risk of cardiovascular disease (having elevated heart rates and blood pressure). The research was presented at the American College of Cardiology Conference in New Delhi, India.

 “In general, chronic elevations of blood pressure are a risk factor for future cardiovascular disease such as heart attack, heart failure, or stroke,” Jason Hopper, a cardiologist at Norton Heart & Vascular Institute, said.

The results were even more serious among those who consistently drank more than 600 mg of caffeine in one day.

“Due to its effect on the autonomic nervous system, regular caffeine consumption could put otherwise healthy individuals at risk of hypertension and other cardiovascular events,” Nency Kagathara, research author and researcher at the Zydus Medical College and Hospital in India, said. “Increasing awareness of these risks is vital to improve heart health for all.”

The relationship between caffeine and the cardiovascular system is well-established. For one, caffeine is known as a vasoconstrictor, which means that it can narrow the blood vessels and raise blood pressure.

“When the blood vessels become more narrow with the same amount of blood moving through them, the pressure increases. This is similar to the same volume of water flowing through a hose versus through a straw,” Amber Core, a registered dietitian at The Ohio State University Wexner Medical Center, said.

Elevated blood pressure increases the workload on the heart, which can sometimes lead to heart failure and abnormal heart rhythms in the long run, she added.

Caffeine is also a stimulant, so it tells the brain to be on alert—this triggers the body’s fight or flight response in the autonomic nervous system, which is responsible for regulating heart rate, blood pressure, and more.

 “As a part of this response, heart rate will often increase as the body prepares for any potential danger or threat,” Core said.

However, these elevations in blood pressure and heart rate are usually seen in the short term after a person consumes caffeine, and are less profound among chronic caffeine drinkers, said Hopper.

“The body can adapt to regular caffeine consumption, so these changes are more noticeable in people who don’t consume caffeine habitually,” he said.

Actually, however, previous research on the consumption of coffee, tea and other caffeinated drinks is mixed.

One study suggested that moderate coffee consumption leads to a decrease in all-cause and cardiovascular-related mortality, hypertension, cholesterol, heart failure and atrial fibrillation. Drinking coffee has also been linked to a lower risk of type 2 diabetes and could protect against dementia, among other benefits.

But other research has found drinking more than two cups of coffee every day could increase risk of dying from cardiovascular disease, specifically for people with very severe hypertension. 

People may also experience a fast heart rate, jitters, tremors or heart palpitations from drinking excessive amounts of caffeine, Aeshita Dwivedi, a cardiologist at Northwell Health Lenox Hill Hospital, said.

Beyond just its effects on the cardiovascular system, caffeine has also been associated with insomnia symptoms. Overconsumption of caffeine may also increase the risk of anxiety or make it worse in those who already live with the condition. 

Though there are both pros and cons associated with it, caffeine is considered healthy in moderation.

“Drinking too much caffeine is not recommended. However, caffeinated drinks are not all created equally. Everyone has a different tolerance, and it should be individualized based on your medical conditions,” said Dwivedi.

“Beverages such as energy drinks can oftentimes not only exceed the recommended amount of caffeine for a day, but also contain added sugars and additional ingredients such as nitric oxide,” said Core.

Added sugars can contribute to poorer heart health and can also put a person at risk for weight gain and type 2 diabetes. And nitric oxide can increase oxygen content in the blood, which is not advised for people with preexisting heart conditions, Core added.

If you are experiencing insomnia, restlessness, rapid heartbeat, or an upset stomach, those might be signs that your caffeine consumption is excessive, Hopper said.

“If you experience these symptoms, you should reduce your caffeine intake,” said Hopper. “The amount of caffeine that triggers these effects can vary depending on individual tolerance and how regularly you consume caffeine.”