Parents may have one more reason to hold off on the sweet treats during their child’s earliest years. New research suggests that eating very little sugar up to the age of two could help protect the brain decades later, potentially lowering the risk of dementia by as much as 23 percent. The findings, published in the journal Neurology, come from an analysis conducted by the Hong Kong University of Science and Technology that examined nearly 65,000 people enrolled in the UK BioBank project.
The study took advantage of what researchers called a natural experiment in British history. Sugar rationing in the UK ended abruptly in September 1953, causing average daily consumption to nearly double overnight from about 41 grams to 80 grams. By comparing people who were toddlers during rationing with those who grew up immediately after it ended, researchers found that those with limited early sugar exposure not only had a lower risk of developing dementia but were also diagnosed about two and a half years later than their peers. Researcher Jiazhen Zheng noted that limiting sugar during the earliest stages of life appears to have lasting benefits for brain health, though further research is needed to confirm the connection.
Independent experts have urged caution when interpreting the results. Rachel Richardson of Cochrane said the study does not represent a smoking gun linking early sugar intake to dementia, noting that researchers could not track how much sugar individuals actually consumed but only knew when they were born relative to rationing. She also pointed out that the findings relate to people born in the 1940s and 1950s, when weaning practices differed significantly from today. Professor Ian Maidment of Aston University echoed that concern, saying that connecting something from eighty years ago to current health outcomes leaves room for countless other factors at play.
Even so, specialists agree there is value in the broader message. Dr Sara Rodrigues of Alzheimer’s Research UK reminded people that while observational studies can identify links between diet and dementia risk they cannot prove direct causation. Still she added that eating a healthy balanced diet remains one of the best ways anyone can support their brain health at any stage of life.