I recently had a series of blood tests done, including for HIV. Blood work was all fine, except the Dr. said that my liver enzyme was somewhat elivated -- 64 was the number he gave me. He said that it was due to my overweight condition (I am 100lbs overweight) and that I should watch my diet. However, I am not sure if I was tested for hepatitis in either this test or my original blood work done a few months earlier. Should I be concerned with an elivated enzyme count of 64 and what do you recommend?

Any abnormal ALT should be further investigated. Of course, the first step would be testing for hepatitis C and B, even if you don't have any definite risk factors. The extent of work-up beyond that will depend on other factors in your medical history. Being very overweight does put you at risk for fatty liver, a relatively benign condition, but one that may still lead to cirrhosis. You should discuss further evaluation with your physician.