Two cans of soda per day during adolescence, and a 52% higher risk of hypertension twenty-five years later. That is the conclusion of a large study published in Circulation, which followed more than 25,000 American youths from childhood into adulthood. Researchers from the Harvard T.H. Chan School of Public Health and the University of Toronto have shown, with a depth of perspective rarely reached on this topic, that beverage habits formed while watching TV at age 12 leave a biological imprint well after high school.
Key Takeaways
- Drinking habits established at age 12 leave measurable biological traces a quarter of a century later
- Fruit juice, long promoted as healthy, carries the same cardiovascular risks as soda for the arteries
- A single daily change could cut lifelong cardiovascular risk by 22%
A Quarter-Century of Data, a Signal That Doesn’t Fade
The study draws on the Growing Up Today Study (GUTS), a U.S. cohort initiated in the 1990s. This longitudinal study ultimately included 25,749 participants after exclusions, drawn from two recruitment waves: the first in 1996 with 16,875 children aged 9 to 14, and a second in 2004 with 10,918 children aged 9 to 16. Follow-up ended in 2021, with participants reporting their lifestyle, health status, and habitual diet through validated questionnaires every one to four years, averaging ages of 12 at entry and 36 at the end of the study.
The central finding can be stated in one sentence, but it deserves elaboration. The highest consumption of sugary drinks (two or more servings per day) and fruit juice (1.5 servings or more per day) was significantly associated with an increased risk of hypertension. It isn’t the single, occasional can on a Wednesday afternoon that worries scientists, but the daily repetition, established as a reflex during years of growth.
The figure of 52% concerns the heaviest consumers. Participants with the highest intake of sugary beverages had a 52% higher risk of developing hypertension than those with the lowest intake. Across the entire cohort, 6.3% of participants reported a hypertension diagnosis during the twenty-five years of follow-up, a rate that rose notably among former heavy soda drinkers.
Fruit Juice, the Study’s Surprising Finding
This is the point that is likely to surprise many parents. Fruit juice, long presented as a healthy alternative to soda in cafeterias and breakfasts, does not escape the negative signal. Participants with the highest fruit juice consumption had a 35% higher risk of developing hypertension. By contrast, whole fruit, on the other hand, was not associated with hypertension risk.
The difference lies in the food’s physical structure more than its pure sugar content. Total fructose intake, when considered in isolation, was not linked to hypertension risk: it is not the sugar itself that matters, but the form in which it enters the body. Juice loses its fiber during pressing, is consumed quickly, and offers no satiety comparable to biting into an orange. The body receives the same fructose, but under completely different absorption conditions.
The authors also looked at what happens when habits are reversed. Replacing one daily serving of a sugary beverage with a whole fruit, milk, or water was associated with a lower risk of hypertension, as was replacing fruit juice with a whole fruit. Concretely, substituting a daily sugary beverage with a whole fruit was associated with a 22% reduction in risk. This is not negligible: a simple change in what is in the glass rather than the fruit bowl could alter the long-term cardiovascular trajectory of an entire life.
Why These Beverages Damage Arteries in the Long Term
The researchers point to a fairly intuitive explanation once you think it through. Beverages deliver large amounts of sugar without the fiber and structure found in a whole fruit, and liquids are typically consumed more quickly than solid foods, providing less satiety and facilitating overeating. A child who drinks two cans in ten minutes does not have time to feel full, unlike someone who chews an apple.
The lead author of the study, researcher Vasanti Malik, sums up the public health stakes in clear terms: “lifestyle habits early in life can have lasting health consequences.” She adds a worrisome observation about current trends: “hypertension is also occurring earlier in life, with rising prevalence among young adults, children, and adolescents, underscoring the importance of early screening and prevention.” Hypertension is no longer a disease confined to the end of a professional career; it is taking hold in thirty-somethings who grew up with a soda machine in the hallway.
What This Means Concretely for Families
The study remains observational: it establishes a solid statistical association rather than direct biological causality. Yet its scale and duration lend it considerable weight that few nutritional studies can claim. Because the study is observational, it cannot prove a cause-and-effect link, but the magnitude and twenty-five-year follow-up give the results substantial significance. The authors recommend supporting existing public health benchmarks that call for limiting sugary drink consumption among the youngest, and not equating fruit juice with fresh fruit in family dietary guidelines.
One practical question that often goes overlooked in these discussions: the fructose in soda and in an orange are chemically identical, but one travels through the body in minutes while the other is accompanied by fibers that slow absorption. This biochemical detail, seemingly minor, could account for a large portion of the risk difference observed over these twenty-five years of follow-up.
Sources: sciencesetcivilisations.fr | futura-sciences.com
