My ALT and AST numbers just broke the 300s, and my GGT has exploded. I was diagnosed with Nonalcoholic Fatty Liver disease last year after a tough round of prednisone, but my numbers have skyrocketed the past few months due to crazy inflammation. I was recently upgraded to Nonalcholic steatohepatitis this week, and have severe inflammation in my liver, as well as scar tissue forming. Has your doc ordered a CT/ liver biopsy yet? Even with numbers in the 100s, most docs aren't too concerned, and just will sometimes up the monitoring (more frequent blood work). Again unless it's damage going on for years and years without end, or sudden progression (as in my case), most docs like to watch and wait, mostly due to the liver being a pretty resilient organ.