ScienceInsights

Apple Watch resting energy estimates are close but not perfect. Here's what the research shows and how to use the number without being misled by it.

Swollen eyelids can stem from allergies, infections, skincare products, or underlying health conditions. Learn what's likely causing yours.

Period clots are often normal, but size and frequency matter. Learn what causes them, what colors mean, and when to see a doctor.

Learn how to build muscle without excess fat gain by dialing in your calories, macros, food choices, and recovery habits.

A clear guide to the four phases of the menstrual cycle, the hormones behind them, and what changes are normal across a lifetime.

Your hearing and balance share the same inner ear structures, which is why hearing loss can affect your stability and increase fall risk as you age.

Frequent bowel movements can stem from diet, exercise, stress, or underlying conditions. Here's what's likely behind yours.

Hangovers are rough, but some remedies actually help. Here's what science says about rehydrating, eating, managing headaches, and recovering faster.

Some vitamins and minerals may support erectile function, but results vary. Here's what the evidence says about D, B vitamins, zinc, and more.

Hair thinning has many causes, from hormones and stress to nutrition and styling habits. Learn what's behind it and what can actually help.