Rachel Carlson

She warns that if someone already feels lonely or if they're struggling with their mental health, a reminder that they're not talking to a real person could destabilize them and make them feel more isolated.

Yeah, it's a good question.

Celeste and Linnea are urging these companies to share their data more openly so they can study these interventions better and hopefully help shape more effective policy.

No, I'm totally with you there.

I was really proud of my 10K until I read this study.

And they found that running extreme distances can damage red blood cells.

These cells are super important.

They carry oxygen throughout people's bodies and transport waste.

So damage to those red blood cells can trigger inflammation or lead to anemia.

They're not talking about us.

That meant trail runners who raced either 24 miles, so a little under a marathon, or who raced 106 miles in ultramarathon.

One of the study authors, Travis Nemkov, put it like this.

When you're doing something like running, your body needs more oxygen.

And that means blood is circulating through your body more quickly, which can lead to the breakdown of red blood cells.

Well, Travis and the researchers do not know whether this extreme amount of exercise is bad.

The study was very small.

It only looked at 23 runners.

And it doesn't tell us anything about the long-term impact of these kinds of races.

And then more broadly, Travis says definitely do not stop doing regular exercise.

It's the best tool we have to keep our bodies healthy and age well.