The only thing I am sure of is that it causes a common liver function test (SGOT) to give bizarre results that can confuse a lot of issues. People who are taking drugs such as Lipitor are surveyed regularly for liver function abnormalities. Containing or being metabolized to phenylalanine, it elevates the liver enzyme alanineaminotransferase. Simply put, the liver says, "What's this stuff" I had better get rid of it!".
I have no idea if it is harmful. Not thinking I swigged some diet Coke and gulped down a quick peanut butter sandwich, forgetting to fast before my appointment. triglycerides were through the roof, SGOT was weird, etc..
I'm fine, BTW.
There is a lot of Luddite misinformation of the web; Little is peer reviewed, and there are a lot of "Causes" going around. You might consider a Medline subscription so you can search real databases, thus avoiding the cranks who really just want to sell selenium supplements and healing crystals.
You may be on to something. I went in for some blood tests last year and the same thing happened with me. triglycerides off the charts, but I went in for another test after fasting and it was much better, though still a little high.