Healthy diets
Learning Center
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
Spastic colon: What does it mean?
This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how accurate is it?
Soy: Does it worsen hypothyroidism?
For most people with hypothyroidism, it's okay to have some soy. But the timing makes a difference.
Soy: Does it reduce cholesterol?
Soy alone doesn't lower cholesterol enough to make a big difference. But eating soy can still be healthy.
Sodium nitrate in meat: Heart disease risk factor?
Sodium nitrate, a preservative in some meats, may increase your heart disease risk.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
Slow metabolism: Is it to blame for weight gain?
Is a slow metabolism the reason for your weight gain? Or is something else going on?
Sleep deprivation: A cause of high blood pressure?
Too little sleep affects not only energy levels but also heart health.
Sleep apnea and caffeine: Any connection?
Caffeine doesn't seem to cause or aggravate obstructive sleep apnea.
Sleep aids: Could antihistamines help me sleep?
Antihistamines can be somewhat effective as a sleep aid — but only for occasional sleeplessness.
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