If you're worried about your brain, reading the entire article might be good exercise for it.

Keto diet makes your brain use ketones instead of glucose for fuel which results in slower brain aging when you're 40-50.

TLDR;

• As people get older, their brain connections start to break down faster in midlife (around 40–60 years) because brain cells don’t use sugar as well. • Giving the brain a different fuel called ketones can help keep those connections strong during this middle‐age window. • This suggests that helping the brain get fuel in midlife could keep it healthier and slow down memory problems later on.

You can ingest ketones on their own (generally expensive supplements), but this article is more interesting in that a ketogenic diet (very low carbs) may have similar benefits.

Here's my regular Claude prompt:

5 bullet points, make sure I fully understand everything in 5 bullet points:

(My deliberate buzzfeedification of the Internet)

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- Brain aging isn't linear - it follows an S-curve with key milestones: onset ~age 43, fastest decline ~age 61, then plateau.

- Insulin resistance drives it - metabolic problems (high blood sugar) appear first in midlife, before vascular or inflammatory issues.

- Neurons can't use glucose but could use ketones - gene analysis shows aging brain regions have high insulin-dependent transporters but also ketone transporters.

- Ketones reverse aging effects, but only ages 40-60 - ketone supplements significantly helped younger/middle-aged brains but did nothing for 60+ year olds.

- There's a critical intervention window - the 40s-50s appear to be when neurons are stressed but still saveable, suggesting early metabolic treatment could prevent dementia.

The article has an abstract. That is the tldr