Liver Issues

Good morning, all. I will celebrate 3 years as a post-op in March; weighed 356 morning of surgery, and now weigh 142 and maintaining for the past year and a half. My question to you all has to do with bloodwork results and liver function -- my bloodwork consistently comes back as showing low liver function and abnormality. My PCP is perplexed and a bit concerned; he can't diagnose exactly what's going on but suspects it has something to do with being so heavy for so many years and then shocking my system with such rapid and significant weight loss. Even though I'm getting plenty of protein and good carbs daily, my tests consistently point to my being malnourished. Anyone else having these kinds of issues? I'm worried. Thanks much. Maureen