Could your sugar-free habits be affecting your brain? A new study links higher intake of artificial sweeteners to faster memory and thinking decline.
- Higher artificial sweetener intake was linked to faster memory and thinking decline
- The strongest associations were seen in adults under 60 and people with diabetes
- Researchers say the findings show a link, not proof that sweeteners cause brain aging
That zero-sugar drink or sugar-free dessert may not be as harmless as it seems. A new study published in Neurology suggests that higher intake of several popular artificial sweeteners is associated with faster declines in memory and thinking skills over time (1✔ ✔Trusted Source
Association Between Consumption of Low- and No-Calorie Artificial Sweeteners and Cognitive Decline
).
Researchers followed nearly 13,000 adults for eight years and found that people consuming the highest amounts of low- and no-calorie sweeteners experienced significantly faster cognitive decline than those with the lowest intake.
The association was particularly strong in adults younger than 60 years and people living with diabetes. However, researchers emphasize that the findings show an association rather than a direct cause-and-effect relationship.
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Are Artificial Sweeteners Linked to Faster Brain Aging?
According to the study, consuming larger amounts of low- and no-calorie sweeteners was associated with a faster decline in overall cognitive performance over an average follow-up of eight years.
The study included 12,772 adults from the Brazilian Longitudinal Study of Adult Health, with participants averaging 52 years of age.
Researchers assessed dietary habits using detailed food questionnaires and grouped participants based on their total intake of artificial sweeteners. They then measured changes in several aspects of brain function, including memory, verbal fluency, working memory, and processing speed.
After accounting for age, sex, blood pressure, cardiovascular disease, and other health factors, the researchers found clear differences between the groups.
People with the highest sweetener intake experienced:
- 62% faster decline in overall thinking and memory abilities.
- Brain aging comparable to about 6 additional years.
- Faster declines in verbal fluency and memory than people consuming the lowest amounts.
Even participants with moderate intake showed a 35% faster decline, roughly equal to 1.3 years of additional brain aging.
The association was strongest among adults younger than 60 years and people with diabetes, who often consume sugar substitutes more frequently to reduce sugar intake. The researchers stressed that the study cannot prove artificial sweeteners directly caused the decline, and further research is needed to understand the relationship.
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Artificial Sweeteners at a Glance
|
Sweetener |
Type |
Sweetness vs Sugar |
Common Uses |
Study Finding |
|
Aspartame |
Artificial |
180–250× sweeter |
Diet soft drinks, chewing gum, yogurt |
Linked to faster cognitive decline |
|
Saccharin |
Artificial |
~300–500× sweeter |
Tabletop sweeteners, beverages |
Linked to faster cognitive decline |
|
Acesulfame K |
Artificial |
~200× sweeter |
Soft drinks, baked foods |
Linked to faster cognitive decline |
|
Erythritol |
Sugar alcohol (polyol) |
~60–80% as sweet as sugar |
Sugar-free foods, beverages |
Linked to faster cognitive decline |
|
Xylitol |
Sugar alcohol (polyol) |
Similar sweetness to sugar |
Chewing gum, oral care products |
Linked to faster cognitive decline |
|
Sorbitol |
Sugar alcohol (polyol) |
~60% as sweet as sugar |
Sugar-free candy, desserts |
Linked to faster cognitive decline |
|
Tagatose |
Rare natural sugar |
~90% as sweet as sugar |
Low-sugar foods |
No significant link found |
According to the Foods review, sugar substitutes include synthetic sweeteners, plant-based sweeteners, and sugar alcohols (polyols). They differ in sweetness, calories, stability during cooking, and effects on blood sugar, which is why different sweeteners are used in different food products (2✔ ✔Trusted Source
Beyond Sugar: A Holistic Review of Sweeteners and Their Role in Modern Nutrition ).
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How Could Artificial Sweeteners Affect Brain Health?
Researchers are still trying to understand how artificial sweeteners might influence brain health. According to a recent review, several possible mechanisms have been suggested, although none have been confirmed in humans (3✔ ✔Trusted Source
Artificial Sweeteners: Benefits, Risks and Controversy
).
Some studies indicate that certain sweeteners may alter the gut microbiome, influence glucose metabolism, affect gut hormone release, or interfere with the brain’s reward pathways, which could indirectly influence learning, memory, and cognitive function.
However, the review also notes that findings remain mixed, and many human studies have not consistently shown these effects.
The Neurology study supports this cautious view. While it found that higher consumption of several sweeteners was associated with faster cognitive decline, the researchers emphasized that the study was observational and cannot explain the biological mechanism behind the association. More long-term clinical research is needed before any conclusions can be drawn.
Are Artificial Sweeteners Still Safe to Consume?
Despite the new findings, health experts say people should not assume that artificial sweeteners are unsafe.
According to the U.S. Food and Drug Administration (FDA), approved sweeteners such as aspartame, acesulfame potassium, saccharin, sucralose, neotame, and advantame have undergone extensive safety evaluations (4✔ ✔Trusted Source
Aspartame and Other Sweeteners in Food
The FDA states that these sweeteners are considered safe when consumed within their Acceptable Daily Intake (ADI) limits and continues to monitor new scientific evidence.
Artificial sweeteners can help people reduce sugar intake, support weight management, improve blood sugar control in some individuals, and lower the risk of tooth decay.
At the same time, it notes that evidence regarding their long-term effects on metabolism, cardiovascular health, and brain health remains inconsistent, which is why experts recommend personalized dietary advice rather than blanket recommendations.
Adding another perspective, a recent study involving 10,974 older adults found no association between consuming artificially sweetened beverages in later life and the risk of developing dementia over an average follow-up of 10.7 years (5✔ ✔Trusted Source
Sweetened Beverages and Incident All-Cause Dementia Among Older Adults
Researchers suggested that the effects of sweetened beverages earlier in life still need further investigation.
Should You Avoid Artificial Sweeteners?
The current evidence does not suggest that everyone should stop using artificial sweeteners. Instead, the latest research highlights the importance of moderation and choosing a balanced diet.
For people who regularly consume large amounts of sugar-free beverages or processed foods containing multiple sweeteners, it may be worthwhile to review their overall dietary habits.
Replacing sugary foods with whole fruits, drinking water instead of sweetened beverages, and limiting ultra-processed foods can support better long-term health.
Researchers also stress that this study found an association, not proof that artificial sweeteners cause brain aging. Future clinical studies are needed to determine whether these sweeteners directly affect memory and thinking or whether other lifestyle factors play a role.
Frequently Asked Questions
Q: Which artificial sweeteners were linked to faster cognitive decline?
A: The study found associations for aspartame, saccharin, acesulfame K, erythritol, sorbitol, and xylitol. Tagatose was not linked to cognitive decline.
Q: Does this study prove artificial sweeteners cause brain aging?
A: No. The study found an association but could not prove that artificial sweeteners directly caused memory or thinking problems.
Q: Who appeared to be most affected in the study?
A: The strongest associations were observed in adults younger than 60 years and people with diabetes.
Q: Are artificial sweeteners approved by food safety authorities?
A: Yes. Approved sweeteners are considered safe by regulators such as the FDA when consumed within recommended daily intake limits.
Q: Should people with diabetes stop using sugar substitutes?
A: Not necessarily. People with diabetes should discuss the best sweetener choices with their healthcare provider and focus on an overall healthy diet.
Q: Which foods commonly contain artificial sweeteners?
A: Diet soft drinks, sugar-free desserts, flavored yogurt, chewing gum, tabletop sweeteners, protein products, and many low-calorie processed foods.
Q: What is the healthiest way to reduce sugar intake?
A: Experts generally recommend limiting added sugars, eating more whole foods, drinking water instead of sweetened beverages, and using sugar substitutes in moderation when needed.
References:
- Association Between Consumption of Low- and No-Calorie Artificial Sweeteners and Cognitive Decline – (https://www.neurology.org/doi/10.1212/WNL.0000000000214023)
- Beyond Sugar: A Holistic Review of Sweeteners and Their Role in Modern Nutrition – (https://www.mdpi.com/2304-8158/14/18/3182)
- Artificial Sweeteners: Benefits, Risks and Controversy – (https://journals.sagepub.com/doi/10.1177/09760016251336000)
- Aspartame and Other Sweeteners in Food – (https://www.fda.gov/food/food-additives-petitions/aspartame-and-other-sweeteners-food)
- Sweetened Beverages and Incident All-Cause Dementia Among Older Adults – (https://jamanetwork.com/journals/jamapsychiatry/fullarticle/2835503)
Source-Medindia