Research analyzing the end of UK sugar rationing in 1953 indicates that children who consumed minimal sugar before age two had a 23% lower dementia risk decades later, though experts caution the findings are not conclusive.

A study of nearly 65,000 people has found that limiting sugar consumption during early childhood may have protective effects on brain health in advanced age. Researchers from Hong Kong University of Science and Technology examined data from individuals who grew up either before or after the UK ended sugar rationing in September 1953. Those who were toddlers during the rationing period showed a 23% lower risk of developing dementia compared to those born after rationing ended, with disease onset delayed by approximately two-and-a-half years on average.

When sugar rationing concluded, average daily consumption nearly doubled from approximately 41 grams to 80 grams almost immediately. The study builds on growing interest in how nutrition during the first 1,000 days of life may shape long-term health outcomes. Researcher Jiazhen Zheng stated that the findings suggest "limiting sugar during the earliest stages of life may have lasting benefits for brain health," with results published in the journal Neurology.

However, experts have raised significant limitations regarding the research. Rachel Richardson from Cochrane noted the study "does not represent a smoking gun" and highlighted that researchers cannot determine precisely how much sugar individual participants actually consumed. Additionally, critics point out that the study's applicability to modern children is questionable, given that weaning practices and overall nutrition patterns have changed substantially since the 1940s and 1950s. Prof Ian Maidment emphasized that "loads" of other factors spanning eight decades could explain the observed associations.

Dr Sara Rodrigues from Alzheimer's Research UK stressed that as an observational study, the research can identify correlations but cannot prove causation. She emphasized that "eating a healthy, balanced diet is one of the best ways to support your brain health," while noting it is never too late to make dietary improvements.