Six widely used sugar substitutes are linked to faster brain aging in adults, according to new research published in Neurology. The study tracked nearly 13,000 participants over eight years and found that higher consumption of low- and no-calorie sweeteners correlated with accelerated declines in memory and thinking skills—particularly among those with diabetes.
Seven Sweeteners Under Scrutiny
The research focused on seven common artificial and natural sweeteners: aspartame, saccharin, acesulfame-K, erythritol, xylitol, sorbitol, and tagatose. These ingredients appear in diet sodas, flavored waters, yogurts, and energy drinks, as well as standalone products marketed as healthier sugar alternatives.
Sorbitol stood out as the most frequently consumed, with an average daily intake of 64 milligrams among participants. The highest consumption group averaged 191 milligrams per day, roughly equivalent to the amount in a single can of diet soda. For comparison, the lowest intake group consumed about 20 milligrams daily.
Cognitive Decline Accelerates with Higher Use
Participants were divided into three groups based on sweetener intake and assessed at three points over eight years. Tests measured verbal fluency, working memory, word recall, and processing speed—key indicators of cognitive function.
After adjusting for factors like age, blood pressure, and cardiovascular disease, the highest consumption group experienced a 62% faster decline in thinking and memory compared to the lowest group. This translated to about 1.6 additional years of cognitive aging. Even moderate use was tied to a 35% faster decline, or roughly 1.3 extra years of aging effects.
These findings do not prove sweeteners directly damage the brain, but the correlation is notable. The study emphasizes that cognitive aging estimates reflect test performance, not biological changes.
Age and diabetes played a role in the results. Adults under 60 showed stronger links between sweeteners and faster declines in verbal fluency and overall cognition. People with diabetes also experienced more pronounced effects, likely due to their reliance on sugar substitutes for blood sugar management.
When researchers analyzed individual sweeteners, six of the seven showed similar patterns. Only one, erythritol, did not demonstrate a clear association with cognitive decline.
Why This Matters in a Broader Context
While sugar substitutes are often marketed as a tool for weight management and metabolic health, this study adds to growing evidence that their long-term effects may extend beyond calories. Past research has linked artificial sweeteners to altered gut bacteria and increased cravings, but cognitive impacts remain less understood. The findings suggest that even moderate use could have measurable consequences over time, particularly for younger adults and those with preexisting health conditions.
Limitations and Next Steps
The study does not establish causation, only an association. Researchers cannot rule out that other dietary or lifestyle factors influenced the results. However, the consistency across multiple sweeteners and the stronger effects in specific groups, like those with diabetes, highlight a need for further investigation.
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