San Diego Padres pitcher David Wells has been diagnosed with type 2 diabetes. According to a report in the San Diego Union-Tribune, the veteran pitcher was informed of the problem about two weeks ago. Type 2 diabetes -- also known as adult-onset diabetes. -- develops when the body can't produce enough insulin. In such cases, the sugar level in the blood can get too high and potentially cause problems with the eyes, heart, blood vessels, nerves and kidneys.