Artificial sweeteners have often been promoted as a healthier substitute for sugar, but recent research raises concerns about their potential impact on brain health. A significant long-term study reveals a connection between the consumption of low- and no-calorie sweeteners and cognitive decline, particularly in individuals under 60.
This pioneering study adds to the growing evidence that artificial sweeteners may carry health risks, although they do offer some advantages like fewer calories, lower cavity risk, and assistance with blood sugar control.
If you’re someone who regularly uses artificial sweeteners, you might wonder what this new research implies for you. Here’s a breakdown.
Which Sweeteners Were Linked to Cognitive Decline?
The study tracked over 12,000 middle-aged adults in Brazil for eight years, assessing their intake of seven commonly used sweeteners through self-reports:
- Aspartame
- Saccharin
- Acesulfame-K
- Erythritol
- Sorbitol
- Xylitol
- Tagatose
“We selected the sweeteners available in Brazil at the time we started the study,” noted Dr. Claudia Suemoto, an associate professor of geriatrics at the University of Sao Paulo. “Unfortunately, some like sucralose and stevia weren’t on the market back then.”
The findings indicated that higher consumption of these sweeteners linked to noticeable declines in overall cognition and verbal fluency, based on varied cognitive assessments. Notably, the most pronounced association between sweeteners and memory decline appeared in those with diabetes.
Surprisingly, adults under 60 showed a larger impact, and there was no significant correlation found for those above 60. This implies that dietary choices made during midlife might carry implications for long-term brain health even before dementia symptoms develop.
Researchers speculate that artificial sweeteners could affect the brain through various mechanisms, including neuroinflammation, neurodegeneration, or disruption of the gut-brain axis.
However, it’s worth noting that these studies often utilize much larger doses of sweeteners than what a typical person might consume in a day. So, it’s unclear if these findings apply to moderate use seen in everyday foods and drinks. “Further research is essential, especially in human studies,” Suemoto said.
Should You Avoid Artificial Sweeteners?
While this is the first significant cohort study linking artificial sweeteners to cognitive decline, Suemoto stresses the need for additional research.
Future studies could benefit from more objective measurements of sweetener exposure and brain imaging to identify affected areas. Alternatively, conducting randomized trials where participants reduce or eliminate artificial sweeteners could provide valuable insights.
If you’re seeking practical advice based on current data, Suemoto suggests moderation: “It’s best to limit consumption as much as possible and ideally avoid them daily.”
The U.S. Food & Drug Administration has classified these sweeteners as safe for consumption, based on the available scientific evidence.
Which Foods Most Often Contain These Sweeteners?
Artificial sweeteners are prevalent in various processed foods and drinks, including:
- Diet sodas and other “sugar-free” beverages
- Sugar-free gum and mints
- Packaged protein bars and shakes
- Low-calorie desserts, candies, and ice creams
- Flavored yogurts and puddings
- “Light” dressings, sauces, and condiments
Healthy Eating Habits to Prevent Cognitive Decline
Research indicates that adopting a diet rich in whole, plant-based foods—like colorful fruits, leafy greens, nuts, whole grains, and legumes—may be the best way to support brain health as you age.
Essential nutrients such as healthy fats, antioxidants, carotenoids, vitamin E, and choline are particularly effective in reducing inflammation and enhancing brain health over time.
If you find yourself reaching for sugar substitutes daily, consider these small, brain-friendly alternatives:
- Replace diet soda with sparkling water flavored with lemon, lime, or fresh berries.
- Instead of flavored low-fat yogurt, go for plain Greek yogurt and mix in a teaspoon of Nutella, cinnamon, or fresh fruit.
- Rather than sugar-free protein bars, choose ones with lower added sugar or make your own energy bites.
