For dancer Zippora Karz, a rising young star with the famed New York City Ballet, being diagnosed with diabetes could easily have ended all her dreams. She was just twenty-one when she was plucked from the corps de ballet to dance solo roles like the Sugarplum Fairy in The Nutcracker. It was near the end of a grueling season when she became exhausted, dizzy, and excessively thirsty. Heavy pancake makeup covered the sores under her arms that would not heal, but still Karz neglected to return her doctor s urgent calls. When she finally went to the doctor, she learned that her blood sugar was...