ScienceInsights

Learn how sunlight, food, and supplements can raise your vitamin D levels, and why factors like body weight and skin tone affect how much you need.

Healthy weight for a 6-foot man isn't one number. Frame size, age, and muscle mass all shift the target in ways BMI alone can't capture.

Most 8-month-olds do best with two naps a day. Learn how long those naps should be and how to handle common sleep disruptions at this age.

Choosing between an HSA and PPO for pregnancy depends on your due date, savings, and risk tolerance. Here's how to run the numbers for your situation.

From decongestants to saline rinses, here's what actually helps ease viral sinus infection symptoms and how to know when to see a doctor.

Learn how to safely care for open foot blisters, including cleaning, covering, and spotting early signs of infection.

Simple, evidence-based steps to lower high blood pressure, how fast each one works, and when to seek emergency care.

Food poisoning pain comes from your gut's own nervous system, toxins, and a serotonin surge — here's what's actually happening inside your body.

Learn the common symptoms of yeast infections, how they differ by location and sex, and what factors can make them more likely to occur.

A normal resting heart rate falls between 60 and 100 bpm, but what's healthy for you depends on fitness, age, and more.