Aspartame, Saccharin Linked to Accelerated Brain Aging, Cognitive Decline: Study Reveals Hidden Sources

You might already know that fake sweeteners—like aspartame and saccharin—are lurking in diet sodas, sugar-free yogurts, and energy drinks. A fresh study published in Neurology just dropped some news: folks who load up on these sugar substitutes experience cognitive decline that’s 62% faster than those who don’t—a brain-aging boost equivalent to about 1.6 extra years over eight years. That’s no small potatoes. And yeah, your brain literally ages faster.

Researchers tracked 12,772 Brazilian adults (average age: 52) over eight years, asking about their diet and testing memory, verbal fluency, and overall cognitive ability along the way. They grouped people by how much sweetener they consumed:

Lowest group: About 20 mg per day

Highest group: Around 191 mg per day, think one can of diet soda’s worth of aspartame

The high-consumption group’s brain functions declined 62% faster, equivalent to 1.6 years of added aging. Even those in the middle group clocked in at 35% faster decline, or around 1.3 extra years of aging. Interestingly, this effect was way stronger for people under 60, especially those with diabetes. No significant cognitive damage was seen in the older crowd.

The not-so-friendly list includes:

Aspartame

Saccharin

Acesulfame-K

Erythritol

Sorbitol

Xylitol

Tagatose (a more natural sweetener) didn’t show any negative link.

You’re probably ingesting them more often than you think:

Diet sodas and flavoured waters

Low-calorie desserts and yogurts

Energy drinks, protein bars, sweetened coffee/tea

Tabletop sweeteners (for coffee or tea)

Just check the labels, many “sugar-free” or “low-calorie” goodies contain at least one of these sweeteners.

Experts aren’t demanding a complete ban, but many recommend cutting back, especially if you're under 60 or managing diabetes.

Smart swaps include:

Go natural with honey, maple syrup, or applesauce

Use tagatose, stevia, or monk fruit sparingly

Focus on whole foods, solid sleep, regular movement, and brain-stimulating activities for long-term cognitive health