Popular sugar substitutes linked to faster brain aging

One diet soda a day sparked panic, eye-rolls, and a full-on sweetener comment war

TLDR: A long-term study linked higher intake of popular sugar substitutes to faster memory and thinking decline, especially in people with diabetes, but it did not prove cause and effect. Commenters immediately turned it into a battle over bad study design, missing sweeteners like stevia, and whether diet soda lovers were being unfairly blamed.

The study itself is eyebrow-raising: researchers followed nearly 13,000 adults in Brazil for about eight years and found that people who consumed the most low- or no-calorie sweeteners had faster declines in memory and thinking skills. The highest intake group declined 62% faster, and for aspartame, that top level was roughly the amount in one can of diet soda a day. Important catch: the researchers only found a link, not proof that sweeteners directly caused brain aging.

But the real fireworks were in the comments, where readers instantly split into Team "This is scary" and Team "This study is a mess". The loudest skeptics dragged the research for relying on self-reported food surveys, with one commenter bluntly dismissing it as "garbage study." Others argued the bigger issue may be who uses sweeteners in the first place: people cutting calories, often because of weight or diabetes, which could already raise the risk of cognitive decline. In other words, commenters were basically yelling, "Correlation is not causation!" in increasingly dramatic ways.

Then came the sweetener fandom wars. People immediately demanded to know why stevia and monk fruit were missing, as if their personal coffee routine had just been subpoenaed. One user went full detective and dropped the study link, while everyone else argued over what even counts as "a lot." The mood was equal parts health scare, fact-check marathon, and beverage identity crisis.

Key Points

  • The study followed 12,772 adults in Brazil for about eight years and examined intake of seven low- or no-calorie sweeteners.
  • Participants with the highest total sweetener intake had a 62% faster decline in overall thinking and memory abilities than those with the lowest intake.
  • The middle-intake group showed a 35% faster decline than the lowest-intake group.
  • The association between sweetener intake and faster cognitive decline was stronger among adults under 60 and among people with diabetes.
  • The article states the findings show an association only and do not prove that sweeteners directly cause cognitive decline.

Hottest takes

"Self-reported dietary information? Then garbage study." — Daishiman
"Until a study is done which properly accounts for this well known correlation, I will remain incredibly skeptical" — cure_42
"no stevia? i avoid all the other ones" — defensem3ch
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