Anxiety disorders affect an estimated one in five teenagers, with significant implications for social development, educational attainment and long-term wellbeing. Worryingly, anxiety that emerges during adolescence frequently persists into adulthood, increasing the risk of ongoing mental health burden and associated health inequalities.
While biological vulnerability, genetics and environmental stressors remain central to our understanding of anxiety, there is growing interest in the role of lifestyle factors – particularly diet. Increasingly, nutrition is being recognised not only for its impact on cardiometabolic outcomes, but also for its potential influence on mental health.
Recent research has added to this conversation by exploring the relationship between sugary drink consumption and anxiety in young people. The review brought together findings from multiple studies published between 2000 and 2025, examining patterns of intake among adolescents aged 10 to 19 and their reported anxiety levels. Across the nine studies included, the majority identified a positive association between higher consumption of sugary drinks and increased likelihood of anxiety. Overall, teenagers with high intake had approximately one-third greater odds of being diagnosed with an anxiety disorder.
Sugary drinks in these analyses included carbonated soft drinks, sweetened fruit juices, energy drinks, sweetened milk beverages and sweetened tea or coffee. Notably, adolescents are among the highest consumers of free sugars in the UK, often exceeding recommended intake levels, with a significant proportion derived from beverages.
It is important to interpret these findings carefully. The studies reviewed were observational, meaning they identify associations rather than causation. It remains possible that anxiety influences dietary behaviours, rather than the reverse. Additionally, socioeconomic factors such as household income and parental education are known to shape both dietary patterns and mental health outcomes.
That said, there are plausible biological mechanisms that warrant further investigation. The gut-brain axis – the bidirectional communication network linking the gastrointestinal system and central nervous system – has been implicated in mood regulation. Diets high in free sugars may influence gut microbiota composition, inflammatory pathways and glycaemic variability, all of which have been linked to mental health outcomes. However, gut health is multifactorial and influenced by sleep, stress and overall dietary quality, making this a complex area of study.
For healthcare professionals and policy stakeholders, the relevance lies in the broader context of prevention. Efforts to reduce sugary drink consumption have traditionally focused on obesity, dental health and metabolic disease. This emerging evidence suggests there may also be mental health considerations worth exploring.
Importantly, sugary drinks represent a modifiable behaviour. Replacing high-sugar beverages with water, milk or low-sugar alternatives is a relatively accessible intervention at both individual and population levels. Given that a single can of fizzy drink can exceed recommended daily sugar intake limits, even small behavioural shifts could meaningfully reduce overall free sugar consumption.
As anxiety rates in adolescents continue to generate concern across education, healthcare and public health systems, identifying modifiable risk factors remains a priority. While further longitudinal and interventional research is needed to clarify directionality and mechanism, the current evidence suggests that dietary patterns – including sugary drink intake – may form part of the wider mental health landscape.
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