Nutrition basics
Learning Center
Caffeine: How does it affect blood pressure?
Caffeine can temporarily increase blood pressure, but its long-term effects on blood pressure are unclear.
Caffeine: Is it dehydrating or not?
Caffeinated drinks usually won't dehydrate you, but water is still your best option.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about vitamin D and coronavirus disease 2019 (COVID-19).
Car sickness in children: Can I prevent it?
Carefully planned pre-trip meals, air ventilation and distractions might help prevent car sickness in children.
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?
Coronary artery spasm: Cause for concern?
This sudden, temporary squeezing of the muscles in an artery wall reduces blood flow to the heart. Know the causes and treatment.
Diabetes and depression: Coping with the two conditions
Diabetes and depression can occur together. Here's what you need to know.
Diet soda: How much is too much?
Diet soda may help you cut calories, but other low-calorie options abound.
Discolored baby teeth: A cause for concern?
Baby teeth can become discolored for many reasons, including inadequate brushing, medications and illness.
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