Nutrition basics
Learning Center
COVID-19, cold, allergies and the flu: What are the differences?
Knowing if you have COVID-19, a cold, the flu or seasonal allergies isn't easy. Find out about the differences between these illnesses.
COVID-19: Long-term effects
Learn about the possible long-term effects of COVID-19.
CT scan
This imaging test helps detect internal injuries and disease by providing cross-sectional images of bones, blood vessels and soft tissues inside the body.
Caffeine content for coffee, tea, soda and more
Find out just how much caffeine is in coffee, tea, soda and energy drinks. You may be surprised at how much caffeine you're consuming.
Caffeine: Does it affect blood sugar?
For some people with diabetes, one cup of coffee may raise or lower blood sugar. Learn how caffeine can affect blood sugar.
Caffeine: How much is too much?
Is your caffeine habit causing problems? Find out how much is too much and if you need to curb your consumption.
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 links between this key vitamin and the widespread viral infection.
Can whole-grain foods lower blood pressure?
Find out if eating whole-grain foods can lower blood pressure.
Cancer survivors: Care for your body after treatment
Cancer survivors can improve their health after cancer treatment with simple changes.
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