In today’s newsletter: The over-the-counter medicine scientists say may raise your dementia risk, everything you need to know about sunscreen, and what foods you need to eat to reduce inflammation.

But first: Why is colon cancer rising in young people? 

MICROGRAPH BY STEVE GSCHMEISSNER, SCIENCE PHOTO LIBRARY

Colon cancer should be on your radar: Today, one in five cases diagnosed occurs in people younger than 54—an 11 percent increase in this age group over the past 20 years. But what is fueling the surge in younger patients?

More stories:
— What is ‘preventative chemotherapy’?  
— Birth control options for men are advancing. Here’s how they work.   

PHOTOGRAPH BY EHSTOCK, GETTY IMAGES

If you suffer from seasonal allergies, have some form of insomnia, or get the occasional cold or cough, chances are you’ve got drugs containing diphenhydramine in your medicine cabinet. But experts say there are serious risks to taking too much of the drug—or taking it too long.

PHOTOGRAPH BY MASSIMO BREGA, SCIENCE PHOTO LIBRARY

PHOTOGRAPH BY JENN EMERLING, NAT GEO IMAGE COLLECTION

With the weather warming up, you may have some burning questions about protecting yourself from the sun’s rays: How much SPF is enough? Does sunscreen expire? What’s the difference between mineral and chemical varieties? Here's what experts want you to know about sunscreen.

BEFORE YOU GO: Can scientists “solve” stress? 

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