Limiting sugar during the earliest stages of life—in the womb and through the first two years—may reduce dementia risk by up to 23% and delay its onset by 2.6 years, according to a new study leveraging the end of WWII sugar rationing in the UK.
The Research
Researchers at The Hong Kong University of Science and Technology analyzed data from 64,737 people born before and after the UK's sugar rationing ended in 1953. Sugar was strictly limited during and after WWII, providing a natural experiment: some participants experienced sugar restriction only in utero, others through age one or two, and others had no restriction at all.
The study, published in Neurology on July 29, 2026, tracked participants from an average age of 55 for 15 years. Among those who experienced rationing before birth and through age one, 388 of 15,025 developed dementia—a 21% lower risk compared to those born after rationing. Those with rationing through age two had a 23% lower risk (456 of 15,256). In contrast, 504 of 23,774 born after rationing developed dementia.
Brain scans on a subset revealed that early sugar restriction was associated with higher total gray matter volume and fewer white matter hyperintensities, markers of cerebrovascular damage. Lead author Jiazhen Zheng, PhD, noted, “Our findings suggest that limiting sugar during the earliest stages of life may have lasting benefits for brain health.”
Why It Matters
These findings highlight the profound impact of early-life nutrition on long-term cognitive health. The first 1,000 days after conception are critical for brain development, and excessive sugar during this window may program the brain for later vulnerability. While this observational study doesn't prove causation, it adds to a growing body of evidence that diet in infancy and pregnancy shapes aging outcomes.
What You Can Do
While you can't change your own early diet, you can influence the next generation. If you're pregnant or caring for an infant, focus on whole foods and limit added sugars—like those in sweets, sugary drinks, and processed snacks. For your own brain health, adopting a diet low in added sugar and rich in nutrients like omega-3s and antioxidants remains a wise strategy.
“Limiting added sugars during pregnancy and infancy may be one beneficial step that families and communities can take,” Zheng said.
Source: Neuroscience News
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