ScienceInsights

Low testosterone affects more than sex drive. Learn the physical, mental, and emotional signs, and how a blood test can confirm what's going on.

Receding gums are more common than most people realize. Here's what the research says about who gets them, why, and what can be done.

Light spotting can be an early sign of pregnancy, but it's not always implantation bleeding. Learn what's normal and when to call your doctor.

Learn what healthy cholesterol numbers look like for adults, what LDL, HDL, and triglycerides mean, and why your ideal range depends on your overall health.

Learn how much aerobic exercise you actually need, what types work best, and how long it takes to see real improvements in cardiorespiratory fitness.

Loud farts are usually harmless, but they can sometimes signal digestive issues like lactose intolerance or SIBO. Here's what the noise actually means.

Calf pain can come from a strain, cramps, or vein issues—but sometimes it signals something serious. Learn what's likely causing yours and when to seek care.

Dandruff is easier to prevent than treat. Learn which shampoo ingredients actually work, how often to wash, and simple habits that keep flakes away.

Benefiber contains wheat dextrin, which may support gut bacteria, but the evidence for calling it a true prebiotic is thinner than you might expect.

Not all drinks hydrate you equally. Learn which beverages, from milk to tea, do the best job of keeping you hydrated throughout the day.