PFAS—short for per- and polyfluoroalkyl substances—are everywhere. The chemicals, which make materials resistant to stains, grease, and water, are also putting our health at risk. Here’s what to know about PFAS...and why there’s good news on the horizon.

Lowering high LDL (“bad”) cholesterol can curb your risk of heart disease. If a heart-healthy diet doesn’t work, prescription drugs can slash LDL. Do over-the-counter supplements also work?

Can a daily aspirin keep breast cancer from recurring? Is active surveillance safe for men with low-risk prostate cancer? Does krill oil curb osteoarthritis pain? We look at those new studies, plus others on type 2 diabetes, stair climbing after meals, dry eye, ultra-processed foods, and the safety of xylitol.