ethnicity

Results from the largest single study of the genetic and environmental causes of asthma in African American children suggest that only a tiny fraction of known genetic risk factors for the disease apply to this population.

In people with type 2 diabetes, the body is less able to use the hormone insulin to regulate blood sugar. The disease affects 350 million patients globally—including 29 million in the United States, where it is the leading cause of blindness, kidney failure, and non-accident-related amputations.