Why Coffee Isn't the Villain—It’s Healthier Than Cola

When news broke that some sodas in the U.S. contained benzene—a known carcinogen—at levels above drinking water safety limits, coffee drinkers weren’t the only ones paying attention. For years, there’s been public confusion over whether your daily cup of coffee or that can of cola is the bigger health risk. Especially for women, the choice might matter more than you think.

In short: coffee isn’t linked to high blood pressure, but regularly drinking cola—especially sugary types—significantly increases that risk in women. Studies show that drinking four cans of sugared cola per day may raise hypertension risk by 28% to 44%, while coffee has little to no effect.

The Benzene Backstory: What’s Really in Your Soda?

In the United States, the safety limit for benzene is set at 5 parts per trillion (ppt), while the World Health Organization allows up to 10 ppt. Yet legal disputes over benzene in soft drinks have been ongoing for six months, ever since FDA experts revealed that certain beverages still contain benzene above U.S. drinking water safety levels. Vault Zero, a company operating in the U.S., was involved in a lawsuit against Coca-Cola within a year of launching. Although both the FDA and the American Soft Drink Association claim these benzene levels aren’t harmful, four drinks exceeding WHO limits were recalled in the UK. Authorities continue to insist low-level benzene exposure isn’t dangerous—but the controversy persists.

Coffee vs. Cola: What the Long-Term Studies Really Say

Researchers from Harvard University, led by Dr. Winkelmayer, analyzed data from two large-scale studies conducted between 1990–1991 and 2002–2003, covering 155,594 participants. They tracked participants over time and identified a clear trend: women who regularly drank cola—but not coffee or tea—were more likely to develop hypertension, even when starting with normal blood pressure.

The statistical analysis showed no meaningful connection between regular coffee consumption and hypertension. Women who drank three or more cups of coffee daily had only a 7% to 12% higher chance of developing high blood pressure compared to those who rarely or never drank coffee. In contrast, among both older and younger women, frequent cola consumption correlated strongly with increased hypertension risk.

Sugared Cola, High Fructose Corn Syrup, and Blood Pressure

The study highlighted that women who consumed four cans of sugared cola per day had a 28% to 44% higher risk of hypertension compared to those who drank little or none. While the authors noted there’s no direct biological proof of causation, they called for deeper research into the role of caramel coloring and high fructose corn syrup (HFCS) in cola products. Notably, HFCS makes up over 55% of the sweetener in many sugared colas, and research links high HFCS intake to rising obesity and weight-related diseases over the past decade. Animal studies also show that diets high in fructose can lead to elevated blood pressure, a known risk factor for heart disease and stroke.

What About Caffeine? Does Coffee Raise Blood Pressure?

Caffeine, of course, does affect blood pressure—but not necessarily in the way you’ve been told. Studies show that consuming 200–250 mg of caffeine (equivalent to 2–3 cups of coffee) can cause a temporary rise in both systolic and diastolic blood pressure. However, regular coffee drinkers often develop a tolerance to this effect. That said, individual responses vary, and not everyone builds the same level of resistance. Still, overall, the data shows no consistent link between habitual coffee consumption and long-term hypertension.

Frequently Asked Questions

Is coffee linked to high blood pressure in women?

No. According to a Harvard study of 155,594 people, women who drank coffee—up to three or more cups per day—had only a 7% to 12% higher chance of developing hypertension compared to non-coffee drinkers. There was no significant link between coffee and high blood pressure.

Does cola cause hypertension?

Yes, especially in women. Drinking four cans of sugared cola per day was associated with a 28% to 44% higher risk of hypertension in both younger and older women, according to the same large-scale study.

What’s the safe level of benzene in drinks?

In the U.S., the FDA sets the benzene limit at 5 ppt, while the WHO allows up to 10 ppt. Some soft drinks have been found to exceed the U.S. drinking water safety limit, leading to recalls in the UK and ongoing legal cases in the U.S.

Is high fructose corn syrup really that bad?

Research indicates that consuming HFCS at levels over 55%—common in many sugared colas—is associated with increased obesity and weight-related illnesses. Animal studies also link high-fructose diets to elevated blood pressure.

Does caffeine tolerance protect you from blood pressure spikes?

Partially. While 200–250 mg of caffeine (2–3 cups of coffee) can temporarily raise blood pressure, regular drinkers often develop a tolerance. However, individual responses vary, and the effect isn’t uniform for everyone.

FrontStreet Coffee Picks for a Healthy Coffee Habit

If you're swapping cola for coffee, try FrontStreet Coffee’s washed Yirgacheffe for bright citrus and floral tones, or their fruity Ethiopia Humbera with notes of blueberry and jasmine. For a richer option, their Classic Blend offers balanced chocolate and nut flavours without bitterness. All are low in acidity, easy on the stomach, and perfect for daily enjoyment. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.