Biological clocks may do more than measure aging

🙌 Happy Friday! 

We’re going back to our timetables this week with our headline story. Biological clocks take center stage, with new research suggesting that the very things used to measure aging might also be accelerating it. Plus, we’ve got exciting research on weight loss, microplastics, and learning about longevity from “super movers.”

Let’s go!

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Researchers studied mice with Heyn-Sproul-Jackson syndrome, a rare genetic disorder that causes features of accelerated aging. They focused on DNA methylation, a molecular process used in many biological age tests and tied to lifespan differences across species.

What they found:

Altering DNA methylation doesn’t necessarily reverse aging in humans. But the data strengthens the idea that these molecular changes may play an active role in the aging process.

Why it matters: If future research continues to show that DNA methylation helps drive aging, scientists may be able to develop therapies that target these underlying mechanisms, potentially slowing or delaying multiple age-related diseases at once.

One of the biggest challenges with using GLP-1s for weight loss happens when people stop taking them. Statistics show that most people regain much of their weight within a year. 

An experimental procedure that ‘resets’ metabolism could provide a much-needed ‘off-ramp,” reports NewsNation.

Called duodenal mucosal resurfacing, early investigational evidence shows that it can help some patients maintain 80% of their weight loss for months after stopping a GLP-1.

What’s more encouraging is the sustained—and even improved—benefits over time compared with those who didn’t get a procedure.

How does it work? The procedure removes the damaged top layer of the mucosal lining in the small intestine, where the body naturally produces GLP-1s and other appetite-regulating hormones. As the tissue repairs, researchers believe it may restore healthy metabolic processes.

The metabolic challenge: Poor metabolic health is a hallmark of aging and raises the risk of obesity, heart disease, type 2 diabetes, stroke, several cancers, and earlier mortality. GLP-1s are transforming obesity treatment (and by extension, could become the first longevity drug), but many people eventually discontinue them. 

Finding an effective way to preserve the metabolic benefits after stopping treatment could be an important piece to sustained health.

Next steps: Resurfacing is not FDA-approved yet, but a larger 300-person clinical trial is underway, with early results suggesting it is safe and shows long-lasting benefits after coming off a GLP-1.

“Pick up the pace!” goes beyond an impatient request in a new study linking walking pace to cognitive longevity. Observational research of nearly 4000 adults in their 80s suggests that those with the fastest walking speed (‘super movers’) had nearly a 50% lower risk of developing cognitive decline. 

Walking engages nearly every major muscle system, so speed can be an effective proxy of overall health, notes science writer and author Bonnie Tsui in NPR. Muscle health and cognitive health often move in tandem as we age.

The main take-homes

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I shouldn’t use chemical sunscreen, right? Ask our AI-powered search engine your questions for real, science-backed research on longevity.

Highlighting your responses to last week's question, featured in ‘Is it aging, or B12 deficiency?’

We asked: What is independent aging to you?

For most of you, it’s agency over your life (58%)—being able to walk up stairs, live in your own home, and think for yourself. But what does it take? It’s the basics. One response: “Good nutrition and exercise [and] movement can help you in your aging process!”