That “diet” soda might cost you more than calories; it could be speeding up memory loss.
- Heavy consumption of artificial sweeteners may accelerate memory and cognitive decline
- People with diabetes and adults under 60 are more vulnerable to these effects
- Health experts recommend using natural alternatives and limiting daily intake
A major Brazilian study indicated that high usage of artificial sweeteners, such as aspartame and saccharin, is associated with a substantially faster deterioration in memory and cognitive skills over eight years (1). These effects were especially strong in diabetics and persons under the age of 60.
The Truth About Artificial Sweeteners
Artificial sweeteners such as aspartame, saccharin, acesulfame-K, erythritol, xylitol, and sorbitol are extensively advertised as healthier alternatives to sugar, particularly in goods aimed at diabetics or those attempting to lose weight. While these compounds are widespread in processed foods, energy drinks, and low-calorie sweets, growing data raise concerns about their long-term effects on brain health. The study, just published in the journal Neurology, does not show causation, but it is the largest to highlight this potential risk.
Memory and Verbal Fluency Get Affected Due to Artificial Sweeteners
Researchers tracked 12,772 adults from across Brazil for an average of eight years, assessing food habits and cognitive ability at various stages. Participants completed regular questionnaires about their usage of seven different low- and no-calorie sweeteners, as well as standardised memory, language, and thinking assessments. Those who consumed the largest levels, approximately 191 mg per day on average, showed a 62% faster cognitive impairment than the lowest group, corresponding to 1.6 years of aging. The middle group likewise decreased faster, at 35%. People under the age of 60 and those with diabetes were particularly vulnerable. The loss was most pronounced in the memory and verbal fluency domains, and it was not observed in those over 60 or with tagatose, a sweetener that has no such connection.
Reliance on Artificial Sweeteners May be Injurious to Brain Health
These data imply that reliance on artificial sweeteners for dietary management may carry unintended consequences, particularly for younger persons and those with diabetes. Given their extensive use, more research is needed to validate these relationships and explore safer alternatives. Health practitioners may want to discuss the cognitive hazards of using artificial sweeteners regularly with patients who are managing diabetes or weight.
Frequently Asked Questions
Which artificial sweeteners are linked to cognitive decline?
Aspartame and saccharin showed the strongest associations with faster memory loss.
How much artificial sweetener is considered high intake?
Around 190 mg per day or more — roughly equal to several packets or cans of diet soda daily.
Are there safer alternatives to artificial sweeteners?
Yes, options like stevia or monk fruit extract are considered safer and more natural substitutes.
References:
- Association between consumption of low-and no-calorie artificial sweeteners and cognitive decline: an 8-year prospective study
(Gonçalves NG et al. Association between consumption of low-and no-calorie artificial sweeteners and cognitive decline: an 8-year prospective study. Neurology. 2025;7;105(7):e214023.)
Source-Medindia