Scientists Link Early-Life Sugar Restriction to 46% Lower Alzheimer’s Risk
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Scientists have found that limiting sugar consumption during pregnancy and the first two years of life is linked to a 46% lower risk of developing Alzheimer’s disease later in life, according to a study of 60,000 Britons born during postwar sugar rationing. The research, using UK Biobank data, also showed lower risks of dementia overall and mental health disorders. The findings come even as the authors stress that the observational study does not prove a causal link.
The Natural Experiment
During and after World War II, the United Kingdom rationed sugar strictly; children under two received none until the policy ended in 1953, after which adult sugar consumption nearly doubled. Researchers exploited this as a natural control group, studying over 60,000 people born between 1951 and 1956 who enrolled in the UK Biobank. They divided the cohort into three groups: those exposed to sugar restrictions only before birth, those exposed before birth and in early childhood, and those with no restrictions.
Reduced Disease Risk
Compared to the no-restriction group, those with early-life sugar limits had a 27% lower risk of dementia of any cause and a 46% lower risk of Alzheimer’s disease specifically. Anxiety risk fell by 20% and depression risk by 11%, while no link to Parkinson’s disease was found. MRI scans suggested that restricted individuals’ brains appeared 0.39 years younger than expected for their age.
Study Limitations
The authors describe the findings as quasi-experimental and caution that they do not establish causation. The study relies on historical data and cannot directly measure the causal effect of sugar on neurodegeneration. They call for additional research in modern populations to confirm the results.
What's Next
The research team plans to analyze contemporary cohorts with varying sugar intake levels to test whether the association persists in today’s dietary environment. It remains unclear whether reducing sugar in early life would yield the same protective effects when high-sugar diets are the norm.
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Scientists Link Early-Life Sugar Restriction to 46% Lower Alzheimer’s Risk
