Scientific Study: Limiting Sugar Before Age 2 Linked to Better Brain Health

Doha: Limiting sugar intake during the first two years of life could have long-term benefits for brain health, with new research suggesting that reducing added sugar in early childhood may lower the risk of dementia and improve brain health decades later. 

The study found that restricting sugar during the first 1,000 days of life—from pregnancy through a child's second birthday—was associated with a reduced risk of dementia, a delayed onset of the disease, and healthier brain profiles later in adulthood. Researchers described this early developmental period as a critical window for shaping lifelong health. 

Researchers analysed data from nearly 65,000 people born before and after World War II in the United Kingdom, taking advantage of historical sugar rationing to compare long-term health outcomes. Those exposed to lower sugar intake before birth and during their first two years of life had a 23% lower risk of developing dementia than individuals born after rationing ended. 

Among participants who eventually developed dementia, those with lower sugar exposure early in life were diagnosed an average of 2.6 years later than those who consumed higher amounts of sugar during infancy. Brain imaging also indicated more favourable markers of brain health among individuals who experienced lower sugar intake in early life. 

The researchers said the findings highlight the importance of good nutrition during pregnancy and early childhood. They suggested that limiting added sugars during this period could become part of broader public health strategies aimed at supporting healthy brain development and reducing the long-term risk of neurodegenerative diseases. However, they cautioned that the study was observational and does not prove that sugar directly causes dementia, meaning further research is needed to confirm the relationship. 

Health experts continue to recommend limiting added sugars in young children's diets while encouraging balanced nutrition rich in fruits, vegetables, whole grains and other nutrient-dense foods to support healthy growth and brain development.