Nutrition basics
Learning Center
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Breast implants and cancer: Any connection?
Concerned about a link between breast implants and cancer? Get the facts.
Bruxism (teeth grinding)
Bruxism is a condition in which you grind, gnash or clench your teeth unconsciously when you're awake or while you're sleeping.
COVID-19 infections by race: What's behind the health disparities?
Understand how underlying health problems, the places where people live and work, and racism can affect who becomes severely ill with COVID-19.
COVID-19: Who's at higher risk of serious symptoms?
Advanced age and some health conditions can raise the risk of serious COVID-19 (coronavirus disease 2019) illness.
Caffeine: How much is too much?
Is your caffeine habit causing problems? Find out how much is too much and if you need to curb your consumption.
Caffeine: Is it dehydrating or not?
Caffeinated drinks usually won't dehydrate you, but water is still your best option.
Calcium supplements: A risk factor for heart attack?
Learn about the possible link between calcium supplements and heart attacks.
Cancer risk: What the numbers mean
The news is full of reports about cancer risk, but what does it all mean for you? Find out how to interpret cancer statistics.
Carbohydrates: How carbs fit into a healthy diet
See why carbohydrates are important for your health and learn which ones to choose.
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