Study: Sweeteners May Harm Cognitive Skills

A large study involving over 12,000 adults has revealed a potential link between common zero-calorie sweeteners and accelerated cognitive decline. Researchers tracked participants for eight years, monitoring their intake of sweeteners and their cognitive functions, including memory and processing speed. The findings indicated that individuals consuming higher amounts of certain sweeteners experienced a notably faster decline in thinking and memory skills.

Specifically, participants consuming around 191 milligrams of sweeteners daily exhibited a 62% faster decline, equivalent to about 1.6 years of brain aging. Even those with lower average intake showed a significant decline. Six of the seven studied sweeteners—aspartame, saccharin, acesulfame K, erythritol, sorbitol, and xylitol—were associated with this cognitive decrease, while tagatose showed no such link.

Interestingly, the observed connection was more pronounced in adults under 60, with no significant link found in individuals over 60. People with diabetes were also highlighted as a group of concern, as they are more likely to use these sweeteners, and the link appeared in middle-aged adults both with and without diabetes.

While the study establishes a correlation rather than causation, researchers speculate on possible mechanisms. Previous research suggests aspartame might cause brain inflammation, and sugar alcohols could affect gut bacteria and the blood-brain barrier. However, the researchers emphasize that self-reported diets can be imperfect, and other factors like the consumption of ultra-processed foods might also contribute to cognitive decline.

The takeaway is that "sugar-free" does not equate to "risk-free." While larger studies are needed, current findings suggest that moderate consumption of these sweeteners, rather than viewing them as an unlimited healthy alternative, is a prudent approach to maintaining long-term brain health.