Study Links Regular Soft Drink Consumption to Altered Brain Development in Teenagers
New research suggests that consuming as little as two cans of caffeinated soda per week may impact adolescent brain structure and mental well-being.
A recent study indicates that regular consumption of caffeinated soft drinks by children and teenagers could lead to subtle changes in brain development and an increased risk of mental health issues. Researchers from King's College London analyzed data from over 9,600 children aged nine to 11, focusing on their weekly intake of caffeinated beverages, including sodas, coffee, and tea.
The findings suggest that consuming as little as 90mg of caffeine per week, equivalent to about two cans of Dr Pepper or one cup of coffee, was associated with distressing psychological symptoms, such as anxiety and depression, approximately 18 months later. Brain scans of the participants revealed minor differences in the surface area of brain regions responsible for learning, reasoning, memory, and problem-solving between those with the highest and lowest caffeine intake.
These structural changes were noted even in children who consumed just one caffeinated drink weekly. The study also found a correlation between higher caffeine consumption and reduced sleep duration, which is a known factor influencing concentration, academic performance, and mental health.
While the study highlights potential links, the authors caution that it does not definitively prove caffeine is the sole cause of these observed changes. Soft drinks often contain high amounts of sugar and are associated with less healthy lifestyle habits, making it challenging to isolate caffeine's specific effects. Further research is planned to investigate these complex interactions.
Experts not involved in the study acknowledge that the observed brain differences were small and that the link to later mental health was negligible. However, they concur with the finding that caffeine can reduce sleep duration in children. Concerns have been raised that current regulations, such as the upcoming ban on energy drinks with more than 150mg of caffeine per liter for under-16s in the UK starting April 2027, do not sufficiently address the caffeine content in many popular soft drinks. For instance, a can of Diet Coke contains about 46mg of caffeine, and a bottle of Mountain Dew contains approximately 54mg.
This research builds upon previous studies linking high caffeine intake among adolescents, particularly from energy drinks, to increased risks of anxiety, depression, and sleep disruption.