NEW YORK (Reuters Health) - Cases of insulin-requiring type 1 diabetes rose sharply in children under the age of five in Philadelphia over a two-decade span - similar to increases seen across the U.S. and Europe, according to new research. "Why are we seeing this large increase in type 1 diabetes in very young children? Unfortunately, the answer is we don't know," said lead study author Terri Lipman, a professor at the University of Pennsylvania School of Nursing. ...