Daily Sugary Drinks Linked to Gastric Cancer Risk

Replacing a daily soda with water, sparkling water, or an unsweetened alternative is one of the simplest ways to cut a measurable cancer risk identified in a new analysis of more than 112,000 adults tracked for decades.

Research drawing on the Nurses’ Health Study and the Health Professionals Follow-up Study found that participants who drank sugar-sweetened beverages more than once per day had more than double the risk of developing gastric cancer compared with people who rarely consumed them. Only daily drinkers had an increased risk; those who had sugary drinks one to three times per month, weekly, or even four to seven times per week showed rates similar to infrequent consumers.

What the Study Measured

Investigators at Massachusetts General Hospital and Harvard Medical School combined decades of dietary and health data from two long-running U.S. cohorts. The Nurses’ Health Study began enrolling female nurses in 1976, and the Health Professionals Follow-up Study started tracking male health professionals in 1986. Participants completed regular food-frequency questionnaires that captured intake of sugar-sweetened sodas, fruit drinks, sports drinks, and artificially sweetened alternatives.

Over the follow-up period, the team tracked gastric cancer incidence across consumption groups. The large cohort size and extended observation window let the researchers adjust for age, smoking, alcohol use, and Helicobacter pylori infection. The authors described the analysis as the first to demonstrate a link between sugary beverage intake and gastric cancer risk with such a long follow-up and large sample.

Key Findings on Beverage Type and Risk

The headline result: drinking sugar-sweetened beverages more than once a day was associated with more than double the gastric cancer risk seen in rare drinkers. The pattern appeared in both men and women, though it was somewhat more pronounced among women. Crucially, the association only appeared at daily consumption levels; lower frequencies showed no meaningful increase in risk.

Artificially sweetened beverages showed no significant association with gastric cancer in this dataset, although separate research has raised separate concerns about artificial sweeteners.

The team also analyzed total fructose intake, a major component of high-fructose corn syrup used in many sugary drinks. Higher fructose consumption correlated with higher gastric cancer rates, suggesting that sugar itself, rather than sweetness or carbonation, drives the signal.

How This Fits With Earlier Research

Researchers in other studies have linked sugary drinks to cancer.

A study published in the Journal of the American Medical Association reported that women who drank one or more sugary beverages daily faced an 85% higher risk of liver cancer.
A separate study found that the glucose-fructose combination in high-fructose corn syrup can accelerate the spread of colorectal cancer.
Earlier work has tied sugary drinks to colon tumor growths and to higher risk of death from cardiovascular causes.

What the Findings Mean for Daily Habits

Because the higher risk was confined to daily consumption, the practical takeaway is that everyday routines matter more than occasional treats. A soda at a party or a lemonade on a hot afternoon did not increase cancer risk in the data; the danger emerged when sugary drinks became a daily fixture.

Easy replacements include sparkling water with a splash of juice in place of a daily soda, and water instead of sports drinks after moderate exercise. Cutting back on sugary drinks also helps manage insulin and inflammation, two pathways implicated in cancer development.

What the Study Cannot Say

The analysis is observational, so it identifies an association rather than proving that sugary drinks directly cause gastric cancer. Residual confounding from unmeasured factors cannot be ruled out. Even so, the consistency with biological mechanisms and the strength of the dose-response relationship support the link.

The findings add stomach cancer to a longer list of conditions tied to daily sugary drink consumption, alongside liver cancer, colorectal cancer progression, and cardiovascular mortality. For people whose routines include a daily sweetened beverage, the data point to a small, repeatable change with outsized potential benefit over time.

FAQ

How many sugary drinks per day raise gastric cancer risk?

The study found that drinking sugar-sweetened beverages more than once per day was associated with more than double the gastric cancer risk seen in people who rarely consumed them. Lower consumption frequencies, including weekly intake, did not show a meaningful increase.

Do diet or artificially sweetened drinks carry the same risk?

In this study, artificially sweetened beverages showed no significant association with gastric cancer risk. Separate research has raised other concerns about artificial sweeteners, so substituting diet drinks is not necessarily risk-free.

Why does daily consumption matter more than occasional intake?

The elevated cancer risk appeared only in people who drank sugary beverages daily. The researchers interpret this as evidence that sugar itself, including the fructose in high-fructose corn syrup, is the key driver, and that the effect accumulates with repeated exposure rather than appearing from single occasions.