In today’s newsletter, can aging be cured? Plus, what to do when you see mold on your food, is bone broth really a “liquid miracle”? And the signs of dementia. 

But first: Feel like you’re aging all at once? Learn why you may age in spurts.  

PHOTOGRAPH BY DAVID GUTTENFELDER, NAT GEO IMAGE COLLECTION

Feel like you aged overnight? A recent study suggests we may not age gradually. Instead, it happens in two significant “bursts”: once in our mid-40s, then again in our early 60s. These key moments could explain the sudden appearance of wrinkles, sagging skin, gray hair, muscle and joint pain, and increased vulnerability to viral infections. Here’s what we know, and ways to reduce the impact.

More on aging:
— Can aging be cured? Scientists are giving it a try.
— This American diet could add 10 years to your life

Thanks for reading. In celebration of Earth Day, please enjoy 50% off Nat Geo Digital, now $19/yr!

PHOTOGRAPH BY ISADORA KOSOFSKY, NAT GEO IMAGE COLLECTION

Alzheimer’s disease and related dementias affect more than 55 million people worldwide and 6.5 million in the U.S. Chances are many of us know, or have known, someone who suffers from cognitive decline. But with different types of dementia stemming from different causes, it can be a challenge to diagnose.

Here are some of the common symptoms, and everything else we do (and don’t) know about the disease. 

More stories about your brain:
— ‘Brain food’ is real. Here’s what to eat to keep it healthy and strong.
— Why are dementia rates rising? The answer is surprisingly simple.

PHOTOGRAPH BY BEN STANSALL, AFP/GETTY IMAGES

PHOTOGRAPH BY NICHOLE SOBECKI

Today is Earth Day, so of course we’re thinking about human health and that of the planet. In this interactive story, learn how African scientists are making sure the world’s second-largest rainforest, the Congo Basin, doesn’t disappear.

Related: 
— Why climate change is still the greatest threat to human health

BEFORE YOU GO: Relieving joint pain? Improving gut health and your skin? Bone broth sounds like a liquid miracle.
Here’s what science says.

Today’s newsletter was edited and curated by Jennifer Baik and produced by Alisher Egamov. Did someone forward this to you? Sign up here to get this newsletter and more.