ScienceInsights

100 oz of water a day may be right for some people and too much for others. Learn what actually determines your hydration needs.

Cold symptoms usually peak around days 2–4. Here's why that window feels so rough and what to expect as your body works through it.

Burning feet are often a sign of nerve damage, diabetes, or a vitamin deficiency. Learn what's likely causing yours and how to find relief.

Learn how long alcohol stays in your system, what affects processing time, and why you can't speed up sobering up.

DayQuil doesn't always relieve headaches, but ibuprofen or naproxen can safely help—as long as you avoid acetaminophen overlap and alcohol.

The circulatory system relies on three parts working together: the heart, blood vessels, and blood. Here's what each one does and why it matters.

Find out how much water you actually need while breastfeeding, why thirst is a reliable guide, and what hydration signs to watch for.

From fiber supplements to stimulant laxatives, here's what actually works for constipation and how to choose the right option based on how quickly you need relief.

At 5 weeks, most babies eat 2–4 oz per feeding. Learn how to read hunger cues and know if your baby is getting enough, whether breastfed or formula-fed.

Safe ways to manage diarrhea in a 1-year-old, including fluids, foods, probiotics, and warning signs that mean it's time to call the doctor.