Early-Life Sugar Restriction Linked to Lower Dementia Risk

A new study suggests that limiting sugar exposure during pregnancy and the first two years of life may be associated with a lower risk of dementia and a delay in its onset decades later. The research, published on July 29, 2026, in the journal Neurology, leveraged the historical end of sugar rationing in the United Kingdom as a unique natural experiment.

Researchers analyzed health data from nearly 65,000 participants in the UK Biobank, comparing those born before and after the rationing policy ended in September 1953. During and after World War II, sugar was strictly rationed, with adults limited to roughly 10 teaspoons per day and young children receiving no separate sugar allowance. When restrictions were lifted, average adult consumption nearly doubled.

The study grouped participants based on whether they experienced sugar rationing while in the womb and during their first one or two years of life. It found that individuals exposed to rationing during those earliest stages had a 21% to 23% lower risk of developing dementia later in life compared to those born after rationing ended. Furthermore, dementia onset was delayed by an average of 2.6 years for those with early-life...