Nutrition basics
Learning Center
Mononucleosis and Epstein-Barr: What's the connection?
The Epstein-Barr virus sometimes causes a disease known as mono. Learn who is at risk and what the symptoms are.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Monosodium glutamate (MSG): Is it harmful?
Monosodium glutamate (MSG) can trigger headaches and other symptoms in some people.
Multivitamins: Do young children need them?
Multivitamins: Are they good insurance for young children?
Narrow stools: Should I be concerned?
Narrow stools may be a sign of narrowing or obstruction of the colon.
Nighttime headaches: How can I get relief?
"Alarm clock" (hypnic) headaches wake people up. But other nighttime headaches also can disrupt sleep. Relief begins with determining the cause.
Nocturnal panic attacks: What causes them?
Nighttime panic attacks can cause sweating, rapid heart rate, trembling, shortness of breath, heavy breathing, flushing or chills. Learn about treatment.
Omega-6 fatty acids: Can they cause heart disease?
This essential fatty acid is found in certain foods and is recommended as part of a healthy diet.
Pet allergy: Are there hypoallergenic dog breeds?
There are no hypoallergenic dog breeds, but you can reduce your allergic reactions.
Phenylalanine in diet soda: Is it harmful?
You may be worried about phenylalanine because of a warning on diet soda. Find out why the warning is there.
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