A study by the University of Surrey suggests that childhood sugar restriction may lower the risk of adult anxiety, according to findings published in Translational Psychiatry. The research analyzed data from over 45,000 UK Biobank participants, revealing that individuals exposed to limited sugar during the first 1,000 days of life had a 33% lower risk of anxiety in adulthood compared to those without such restrictions [https://www.euronews.com/2026/09/25/could-childhood-sugar-intake-raise-the-risk-of-adult-anxiety]. The study, led by Dr. Hana Navratilova of IPB University, Indonesia, examined how early-life sugar exposure influences mental health, dietary behaviors, and neurodevelopment. Participants were grouped based on their exposure to post-World War II UK sugar rationing, which restricted intake to roughly 40 grams per day for adults from 1940 to 1953 [https://www.surrey.ac.uk/news/sugar-exposure-early-life-linked-anxiety-adulthood].
Study Finds Link Between Early Sugar Restriction and Lower Adult Anxiety
The research found that women who experienced limited sugar exposure during early life were particularly likely to report lower anxiety risks. Brain imaging analysis revealed significant differences in 80 of 139 gray matter regions among rationing groups, with 11 regions showing distinct variations compared to those never exposed to rationing. Participants with the longest sugar restriction also reported a reduced preference for sweet foods in adulthood, suggesting long-term dietary impacts [https://www.surrey.ac.uk/news/sugar-exposure-early-life-linked-anxiety-adulthood].
Implications for Public Health and Brain Development
The study highlights the critical role of early nutrition in shaping mental health and brain structure. Dr. Navratilova emphasized that understanding sugar’s lifelong effects could inform public health policies to reshape diets. Knowing the full impact that sugar can have on our physical and mental health, across our lifespan, could help inform public health policy and reshape our diets,
she stated [https://www.surrey.ac.uk/news/sugar-exposure-early-life-linked-anxiety-adulthood].
Professor Nophar Geifman, a senior author of the study, noted the uniqueness of the UK Biobank dataset, which allowed researchers to observe gradual sugar intake increases post-rationing. Despite increased sugar consumption after rationing amongst participants, early nutritional environments appear to have lasting relevance for mental health,
he said [https://www.surrey.ac.uk/news/sugar-exposure-early-life-linked-anxiety-adulthood].
The findings align with broader research on the first 1,000 days of life as a critical window for brain development. The study’s authors cited previous work linking sugar-rich diets to reduced serotonin neurons, which regulate mood. However, experts caution that the study does not prove causation, as other factors like socioeconomic conditions during the post-war era may influence outcomes [https://www.yahoo.com/news/science/articles/sugar-early-life-linked-anxiety-151011898.html].
Context and Limitations of the Natural Experiment
The study's design used a rare historical context: post-war sugar rationing in the UK, which created a natural experiment. Researchers compared groups based on rationing exposure, including those who experienced it in utero and up to 24 months of age. A control group of individuals born before rationing and those from Ireland were also analyzed [https://www.surrey.ac.uk/news/sugar-exposure-early-life-linked-anxiety-adulthood].
While the data offers valuable insights, the study acknowledges challenges in isolating sugar’s effects. Rationing coincided with broader dietary and social changes, complicating the identification of direct causal links. Rationing changed much more than sugar; families' overall diets changed as well,
noted one expert [https://www.yahoo.com/news/science/articles/sugar-early-life-linked-anxiety-151011898.html].
Despite these limitations, the research underscores the importance of early nutrition. The authors argue that the findings reinforce clinical observations about the first 1,000 days as a critical period for brain development. For parents, it’s not about guilt over those treats but a practical reason to cut back on added sugar during pregnancy and the toddler years,
said Dr. Navratilova [https://www.euronews.com/2026/09/25/could-childhood-sugar-intake-raise-the-risk-of-adult-anxiety].