A historic analysis indicates that limiting sugar intake during the first two years of life could reduce the risk of dementia decades later, highlighting the importance of early nutrition for lifelong brain health.
A study published in Neurology suggests that sugar restriction in the first 1,000 days after conception may be linked to a lower risk of dementia decades later, adding to a growing body of research on how early nutrition can shape adult health. The findings come from an analysis of UK Biobank participants born around the end of post-war sugar rationing in Britain, which gave researchers a natural comparison between people exposed to rationing in the womb and early childhood and those who were not.
Jiazhen Zheng of the Hong Kong University of Science and Technology and colleagues examined 64,737 participants born around September 1953. About 40,963 had some exposure to sugar rationing before age 2, while 23,774 did not. The team found that being exposed in utero and during the first year of life was associated with lower risks of all-cause dementia and Alzheimer’s disease, and exposure that lasted through age 2 was linked with similar or slightly stronger reductions. In that group, dementia and Alzheimer’s disease also appeared to begin several years later than in those without early exposure.
The study also reported brain and cognitive differences that pointed in the same direction. Earlier sugar restriction was associated with greater total grey matter volume, lower white matter hyperintensity volume and better performance on tasks measuring processing speed and reasoning. The researchers said a portion of the dementia link appeared to run through lower rates of type 2 diabetes and hypertension, both of which are established risk factors for later cognitive decline.
The Neurology paper sits alongside other recent studies that have used the end of British sugar rationing as a historical natural experiment. Research published in Nature Human Behaviour found that early-life sugar restriction was associated not only with lower risks of dementia but also with reduced risks of depression and anxiety, while a separate Nature Communications study linked the same exposure to a lower risk of heart failure and later onset of the condition. Other analyses from the UK Biobank have also suggested that higher sugar intake in adulthood is associated with a greater dementia risk, underscoring the broader concern that sugar exposure across the life course may matter for brain and heart health.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
