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Learning Center
Video: Smoking — Anatomy of nicotine addiction
This animation illustrates how smoking changes your brain, causing nicotine addiction.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
Vitamin B-12 and depression: Are they related?
Low levels of vitamin B-12 and other B vitamins may be linked to depression, but more research is needed.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D deficiency: Can it cause high blood pressure?
Too little vitamin D is bad for the bones, but what about the heart? Learn how a low vitamin D level may affect blood pressure.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Wet macular degeneration
Blurred vision or blind spots could be a sign of this chronic eye disorder. Recognizing the warning signs could save your vision.
What are legumes, anyway?
Legumes are low in fat and high in fiber. Common legumes include beans, peas and lentils. Here are some tips for adding these nutritional powerhouses to your diet: 1. Add beans, peas or lentils to soups, stews, and casseroles. 2. Use pureed beans as the basis for dips and spreads. 3. Add chickpeas or black beans to salads. 4. Snack on a handful of soy nuts rather than on chips or crackers.
When the heat is on, which oil should you use?
Olive, canola or grapeseed? Which cooking oil should you use for sauteing and frying?
White stool: Should I be concerned?
White stool may mean a serious liver problem. Learn about causes.
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