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Artificial Sweeteners Cause Cognitive Decline? (NEW STUDY)

Renaissance PeriodizationJuly 1, 202616m

In a Nutshell

A large 8-year observational study linked higher artificial sweetener intake to greater cognitive decline, but this association is likely due to reverse causality: people already in poor metabolic health (higher BMI, diabetes, hypertension) use more sweeteners and are also at higher risk for cognitive issues. Randomized controlled trials consistently show no harmful effects on weight, glucose control, or cardiometabolic markers when sweeteners replace sugar, and some trials even show benefits for weight loss. The core takeaway is that artificial sweeteners appear metabolically neutral and are preferable to excess sugar, with the real drivers of cognitive decline being obesity, diabetes, and poor diet rather than the sweeteners themselves.

AI-Generated Notes

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The folks that used artificial sweeteners the most in the study had the most cognitive decline. How could sweeteners cause cognitive decline if that really is what's going on? So, we have finally have a study maybe by chance that shows artificial sweeteners are doing bad things, but hold on a second. How artificial sweeteners might affect health is not the same thing as strong evidence that they do affect health. So, should you stop consuming artificial sweeteners?

A massive study just came out. Gang Clawson et al. The study title is association between consumption of low and no calorie artificial sweeteners and cognitive decline in eight-year prospective study in the Journal of Neurology. Published in 2025. Eight years. 12,000 people included in the study. The folks that used artificial sweeteners the most in the study had the most cognitive decline.

The sweeteners examined included aspartame, saccharin, acesulfame K, acesulfame potassium, erythritol, xylitol, sorbitol, and tagatose. The paper reported associations for most of these with cognitive decline, except for tagatose.

This study design cannot establish cause and effect. It can only establish correlations, aka associations. Because no variables were purposefully altered and others maintained the same for us to be able to infer cause and effect.

A while back, another study found that artificial sweetener consumption was correlated with higher body weights, which led some people to conclude that artificial sweeteners actually cause body weight gain. But it turns out every time we ran an experimental study where we gave one group artificial sweeteners and the other group not giving them artificial sweeteners, the artificial sweeteners group lost just as much weight, sometimes more weight, than the group that wasn't given them. And so it turned out that it was just correlationary, and the reason it was correlated is because when you look at population size cohorts, guess who does more diet products? People trying to lose weight. Guess who's trying to lose weight? Fat people. So, when you look at who uses artificial sweeteners more, it's fatter people use them more because skinny people don't give a damn.

Gut Microbe and Brain Axis

This is probably the strongest idea for a shared pathway. Sweeteners have been demonstrated to alter gut bacteria and gut bacteria and brain signaling pathways. This is definitely a thing. It doesn't prove anything, but gut bacteria could be a mechanism.

Metabolic Dysregulation

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