Nutrition basics
Learning Center
Caffeine: Is it dehydrating or not?
Caffeinated drinks usually won't dehydrate you, but water is still your best option.
Carbohydrates: How carbs fit into a healthy diet
See why carbohydrates are important for your health and learn which ones to choose.
Cellulitis infection: Is it contagious?
Cellulitis — a common, potentially serious bacterial skin infection — is not directly contagious.
Cervical cysts: Can they be cancerous?
Cervical cysts usually aren't cancerous. Some types of cervical cysts are so common that they're considered a normal feature of cervical anatomy.
Chart of high-fiber foods
Looking to eat more fiber every day? Here are some common foods that can help.
Cigar smoking: Safer than cigarette smoking?
Despite what you might think, cigars aren't that different from cigarettes. Like cigarettes, cigars contain nicotine, tobacco and cancer-causing chemicals.
Clinical depression: What does that mean?
The term "clinical depression" means severe, persistent depression. It's also called major depression or major depressive disorder.
Coconut water: Is it super hydrating?
This drink is promoted as "super hydrating." But is it really any better than plain water?
Coffee and health: What does the research say?
Has coffee gotten a bum rap? Can it be part of a healthy diet?
Cold or allergy: Which is it?
Although colds and seasonal allergies share some of the same symptoms, they are very different diseases. Learn how to tell the difference.
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