ScienceInsights

Trans fat is worse than saturated fat, but both can harm your heart. Learn how much is safe and what healthier fats to eat instead.

Pregnancy tests do expire, and using an old one can affect accuracy. Here's what you need to know to get a reliable result.

Exercise bikes offer real cardiovascular, metabolic, and mental health benefits. Here's what the research says about calories burned, muscles worked, and how to ride effectively.

Sunburn pain typically peaks 24–36 hours after exposure. Learn why it hurts so long, how mild and severe burns differ, and what actually helps.

What you eat before a morning workout matters, but so does timing. Here's how to fuel up based on how much time you have.

NuvaRing can still protect you during the ring-free week, but timing matters. Here's how the break week works and what to know about effectiveness.

Full-body weakness can stem from low blood sugar, dehydration, anemia, thyroid issues, and more. Learn what might be behind it and when to see a doctor.

Osteoporosis and osteoarthritis sound similar but affect the body differently. Learn how to tell their symptoms apart and why it matters for your care.

Learn which COVID symptoms are most common today, how they differ from a cold or flu, and when to test or seek medical care.