Regular coffee consumption may be more than a morning ritual—it could offer measurable health advantages. A new study from researchers at Tufts University suggests that drinking black coffee, or coffee with minimal added sugar and saturated fat, is associated with a lower risk of death from all causes and cardiovascular disease. However, the potential benefits appear to decline when sweeteners and fatty creamers are added. These additives may reduce coffee’s protective effects.
The observational study, published in The Journal of Nutrition, analyzed over two decades of dietary data and mortality outcomes from a large, nationally representative sample. Researchers found that people who drank 1–2 cups of caffeinated coffee daily—without significant added sugars or saturated fats—had up to a 14% lower risk of all-cause mortality compared to non-coffee drinkers. However, these benefits did not extend to coffee heavily laden with sugar or cream.
“With nearly half of American adults reporting drinking at least one cup per day, it’s important for us to know what it might mean for health,” said Professor Fang Fang Zhang, the study’s senior author.
A closer look at the study design
The study examined data from 46,000 U.S. adults aged 20 and over, collected through the National Health and Nutrition Examination Survey (NHANES) between 1999 and 2018. Participants reported their dietary intake, including detailed information about their coffee consumption habits.
Coffee intake was categorized by:
- Caffeine content (caffeinated vs. decaffeinated)
- Added sugar (low vs. high)
- Saturated fat (low vs. high)
The researchers then linked these categories with mortality outcomes, specifically death from all causes, cardiovascular disease, and cancer.
Low sugar intake was defined as no more than 2.5 grams per 8-ounce cup—about half a teaspoon—while low saturated fat was defined as no more than 1 gram per 8-ounce cup, equivalent to 5 tablespoons of 2% milk or 1 tablespoon of cream or half-and-half.
Consumption of at least one cup of coffee per day was linked to a 16% lower risk of all-cause mortality, while 2–3 cups showed a slightly greater reduction at 17%. However, beyond three cups a day, no additional protective effect was observed, particularly for heart-related deaths.
The caffeine effect and decaf limitations
Interestingly, decaffeinated coffee did not demonstrate a statistically significant association with reduced mortality. The researchers suspect this may be due to the relatively small number of decaf drinkers in the study population.
“The health benefits of coffee might be attributable to its bioactive compounds, but our results suggest that the addition of sugar and saturated fat may reduce the benefits,” emphasized Professor Zhang.
Some of these potentially beneficial compounds include polyphenols, diterpenes, and antioxidants, which may contribute to improved heart health and reduced inflammation. For more on these compounds, visit this Harvard Health article on coffee and health.
Few studies quantify coffee additives
While the health impact of coffee itself has been widely studied, few studies have examined how additives like sweeteners and creamers might influence its effects. This new research is among the first to not only acknowledge their presence but also quantify their contribution to health outcomes.
“Few studies have examined how coffee additives could impact the link between coffee consumption and mortality risk, and our study is among the first to quantify how much sweetener and saturated fat are being added,” said Bingjie Zhou, first author and recent Ph.D. graduate from Tufts’ nutrition epidemiology and data science program.
The study offers practical implications. For those who prefer their coffee black or lightly sweetened, the health-related findings are promising. However, for the large population that consumes flavored lattes or sugar-heavy brews, the benefits may be diminished or lost entirely.
What this means for your morning cup
This study contributes to growing evidence suggesting that moderate coffee intake can be part of a healthy lifestyle—but only if the drink isn’t diluted with excess sugar or high-fat dairy. For individuals trying to balance taste and health, cutting down on sugar and opting for low-fat or plant-based creamers could be a worthwhile compromise.
For broader context on coffee’s place in dietary guidelines, you can refer to the U.S. Dietary Guidelines which support moderate coffee consumption as part of a balanced diet.
While these findings are based on observational data and cannot establish direct causality, they provide a valuable foundation for future research. Until then, your best bet may be to enjoy your coffee closer to black than beige.
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