Nutrition basics
Learning Center
Time to cut back on caffeine?
That morning cup of coffee or early afternoon soda is probably OK. But more than 400 milligrams of caffeine a day, or more than about four cups of coffee, can cause insomnia, restlessness, headaches and other problems. Start paying attention to how much caffeine you're getting from foods and beverages. Check labels. If you decide to cut back, do it gradually. For example, drink a smaller cup of coffee each day. This will help your body get used to the lower levels of caffeine and lessen potential withdrawal effects.
Thyroid peroxidase antibody test: What is it?
A thyroid peroxidase antibody test can help determine the cause of thyroid disease.
Tetralogy of Fallot
These four heart problems present at birth change how blood flows through the body. Know the symptoms and treatment.
Testicular exam
Examining your testicles regularly can help you notice changes when they occur and identify testicular problems.
Tay-Sachs disease
This rare, inherited disease causes a buildup of fatty acids that damages the brain and typically results in muscle control loss, blindness and paralysis.
Taurine in energy drinks: What is it?
Energy drink ingredients can cause concern for some who consume these beverages.
Stress test
This test gives important information about your heart health. Know how to prepare and what to expect.
Stool DNA test
Learn about this noninvasive colon cancer screening test that can detect DNA changes in cells collected from a stool sample.
Spitting up in babies: What's normal, what's not
Spitting up in babies is common — and usually nothing to worry about.
Spina bifida
Learn about this condition in which an unborn baby's spine and spinal cord don't form properly. Surgery during pregnancy may be a treatment option.
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