Sugary Drinks Linked to Higher Anxiety in Teenagers, New Research Reveals

A growing body of evidence suggests that what teenagers drink may significantly impact their mental health. A new comprehensive review of studies published between 2000 and 2025 has found a concerning link between high consumption of sugary drinks and increased anxiety levels in adolescents.

The research, conducted by a team led by Bournemouth University’s Chloe Casey, analyzed data from nine studies involving young people aged 10 to 19. Seven of these studies revealed a clear association between sugary drink intake and anxiety symptoms.

The findings are particularly striking: teenagers who consumed the highest amounts of sugary drinks had 34% higher odds of being diagnosed with an anxiety disorder compared to those who consumed less. This association held true across different types of sweetened beverages, including fizzy drinks, colas, sweetened fruit juices, energy drinks, and sweetened tea or coffee.

The Teenage Anxiety Crisis

Anxiety affects an estimated one in five teenagers, with the condition potentially disrupting social lives, academic performance, and overall well-being. What makes this particularly concerning is that anxiety disorders beginning in adolescence often persist into adulthood, creating long-term mental health challenges.

While biological, genetic, and environmental factors are well-established contributors to anxiety risk, this new research adds diet to the list of modifiable factors that could help protect teenage mental health.

The Sugar Problem

UK dietary guidelines recommend that free sugars—including added sugars and those naturally present in honey, syrups, and fruit juices—should make up no more than 5% of daily calorie intake. However, adolescents typically consume the most free sugar of any age group, sometimes accounting for up to 20% of their daily energy intake.

Sugary drinks are a major culprit, with some teenagers getting a fifth of their daily calories from these beverages alone. A single can of fizzy drink can contain around 35 grams of sugar—well above the recommended daily limit of 30 grams for adolescents and adults.

How Might Sugary Drinks Affect Mental Health?

While the studies reviewed were observational and cannot prove causation, several mechanisms could explain the link between sugary drinks and anxiety:

The gut-brain axis, the communication network linking the digestive system to the brain, may play a crucial role. High sugar intake can disrupt gut bacteria balance, potentially affecting mood regulation. Additionally, the rapid blood sugar spikes and crashes caused by sugary drinks can trigger stress responses in the body.

Other factors like overall diet quality, stress levels, sleep patterns, and family circumstances also influence both mental health and beverage choices, making the relationship complex.

Practical Steps for Parents and Teens

The research suggests that reducing sugary drink consumption could be a valuable strategy for supporting adolescent mental health. Here are practical ways to cut back:

• Replace sugary drinks with water, milk, or sugar-free alternatives
• Add natural flavor to sparkling water with lemon, cucumber, berries, or mint
• Switch energy drinks to lower-caffeine options like tea or coffee
• Choose artificially-sweetened drinks in moderation
• Be aware that even “healthy” seeming options like sweetened fruit juices can be high in sugar

Looking Ahead

While numerous studies have examined how reducing sugary drinks impacts physical health in adolescents, there’s now an urgent need to investigate whether these dietary changes also benefit mental health. Given the rising rates of teenage anxiety and the widespread consumption of sugary beverages, this research could have significant public health implications.

As concerns about adolescent mental health continue to grow, identifying modifiable lifestyle factors becomes increasingly important. Although the exact mechanisms remain unclear, this study suggests that what teenagers drink may be more important for their mental well-being than previously thought.

The findings add to a growing list of reasons to limit sugary drink consumption, alongside concerns about obesity, dental health, and now, mental health. For teenagers and their families, making informed choices about beverages could be a simple yet powerful step toward better mental well-being.

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