We don’t know much about the tiny pieces of plastic, called microplastics, that have been detected in the human body, but we know they’re there—and growing evidence suggests they may negatively impact our health. At least one product on the market estimates the number and size of microplastic particles you carry, using an at-home blood and saliva test. When health columnist Sumathi Reddy tried it out, she got few answers.

Our Health newsletter is getting a makeover. Next week, we’ll bring you the first edition of WSJ Wellness, a weekly look inside the business and culture of wellness—and how it affects you—written by reporter Sara Ashley O’Brien. If you’re reading this in your inbox, hit reply to let us know what you think. 

We all know that life is finite. But some people live far longer than others, and it isn’t always clear why longevity varies from person to person. How much do you know about longevity? Take our quiz to test your knowledge.

How Americans eat is being transformed by GLP-1 medications. Users of the drugs have reported duller senses of taste, less pleasure from eating and related side effects around flavor—phenomena characterized by some as “Ozempic tongue.” Chef and spice master Lior Lev Sercarz has some ideas.

Biotechs are racing to turn a toad poison into a commercially available treatment for severe mental health disorders, like depression, anxiety and PTSD.