A recent study suggests that limiting sugar intake during the earliest stages of life may provide lasting benefits for brain health, potentially reducing the risk of dementia decades later. Researchers from The Hong Kong University of Science and Technology in Guangzhou, China, conducted the analysis using data from nearly 65,000 individuals born around the time of World War II, when the British government implemented sugar rationing across the United Kingdom.
During the rationing period, sugar consumption was significantly restricted. However, once these restrictions were lifted in 1953, average daily sugar intake among the population nearly doubled, climbing from approximately 41g to 80g. To evaluate the long-term effects of this shift, investigators categorized participants based on their exposure to sugar rationing: those exposed before birth and during their first year of life, those exposed before birth and up to the age of two, and those born after the rationing had concluded.
By examining medical records when participants reached roughly 55 years of age and tracking dementia diagnoses over the subsequent 15 years, the team identified a clear correlation. Individuals exposed to sugar rationing before birth and throughout their first year of life demonstrated a 21% lower risk of developing dementia compared to those born after rationing ended. For those exposed to the restrictions before birth and up to the age of two, the risk reduction was even higher, at 23%.
Furthermore, among the study participants who were eventually diagnosed with dementia, those who had experienced lower sugar levels early in life received their diagnoses an average of 2.6 years later than their counterparts. Study author Jiazhen Zheng noted that these findings underscore the importance of early-life nutrition. While Zheng emphasized that further research is required to fully understand the mechanisms behind how early sugar exposure influences dementia risk, the authors concluded that limiting added sugars during pregnancy and infancy is a beneficial step that families and communities can adopt as a strategy for future brain health.
