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Learning Center
VLDL cholesterol: Is it harmful?
Like LDL cholesterol, very-low-density lipoprotein (VLDL) cholesterol is considered a type of 'bad' cholesterol.
Vertebral tumor
Vertebral tumors grow in the bones of the spine, causing pain and weakening the spinal column. Read more about how they’re managed, and what to expect.
Video: 3 things you didn't know about cold sores
Cold sores on the lips can be embarrassing and tough to hide. Most people who are infected with the virus that causes cold sores never develop symptoms.
Video: Heart and circulatory system
Watch this video to see how a healthy heart works.
Video: How cancer spreads
Watch this video to see how cancer spreads (metastasizes).
Video: Melanoma — Early stage and advanced melanoma
Melanoma — Video explains early-stage melanoma and advanced melanoma.
Video: Ovulation
Ovulation — the release of an egg from an ovary — occurs about midway through the menstrual cycle. See how it happens.
Video: Rotator cuff damage
See how your rotator cuff can become damaged.
Walking pneumonia: What does it mean?
Walking pneumonia is a mild bacterial infection that resembles a cold. It usually does not require bed rest or a hospital stay.
What are added sugars?
Beverages such as soda and fruit drinks are a major source of added sugar in the U.S. diet. Added sugars contribute calories but no essential nutrients to your diet. Dietary guidelines recommend limiting added sugars to less than 10 percent of total calories. That's 200 calories for a 2,000-calorie-a-day diet. Consider that a 12-ounce can of soda has upwards of 100 calories from added sugars.
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