A landmark study by French researchers uncovers a potential link between higher sugary drink consumption and increased cancer risk. These findings, while requiring further validation, strengthen evidence that cutting back on sugary beverages—combined with other healthy habits—could help prevent cancer cases.
The team investigated associations between sugary drinks (sugar-sweetened beverages and 100% fruit juices), artificially sweetened (diet) drinks, and risks of overall cancer, breast cancer, prostate cancer, and colorectal cancer. Data came from 101,257 healthy French adults (21% men, 79% women) with a mean age of 42 years at baseline.
Participants completed at least two validated 24-hour online dietary questionnaires tracking habitual intake of 3,300 foods and drinks. They were followed for up to 9 years (2009-2018).
Daily intakes of sugary and diet drinks were calculated. Participants' self-reported first cancer cases were verified via medical records and national health insurance databases. Analyses adjusted for key factors like age, sex, education, family cancer history, smoking, and physical activity.
Men averaged higher sugary drink intake (90.3 ml/day) than women (74.6 ml/day). During follow-up, 2,193 cancers were confirmed (693 breast, 291 prostate, 166 colorectal), with a mean diagnosis age of 59 years.
Each additional 100 ml of sugary drinks daily was tied to an 18% higher overall cancer risk and 22% increased breast cancer risk. Both 100% fruit juices and other sugar-sweetened drinks showed links to overall cancer. No associations emerged for prostate or colorectal cancers, possibly due to fewer cases.
Artificially sweetened drinks showed no cancer link, but researchers advise caution given lower consumption levels in the group.
Possible mechanisms: sugar promotes visceral fat (around liver and pancreas), spikes blood sugar, and raises inflammation—all cancer contributors. Additives in some sodas may also factor in.
