Elevated Liver Enzymes

No I dont have Elevated LE.
But in past have seen some ppl reporting elevated LE after doing LF. They had normal LE before the flushes.
Does that mean LF can sometimes be harmful to the liver.?
Any insight on this will be appreciated.

Here is a link on Andreas book "The Amazing Liver and Gallbladder Flush"
http://www.ener-chi.com/more_liv.htm
HE stated in one paragraph,
The failure to recognize the incidence of gallstone formation in the liver may very well be the most unfortunate oversight that has ever been made in the field of medicine, both orthodox and complementary. Relying so heavily on blood tests for diagnostic purposes, as conventional medicine does, may be a big disadvantage with regard to assessing liver health. Most people who have a physical complaint of sorts have perfectly normal liver enzyme levels in the blood, despite suffering liver congestion. Liver congestion and stagnation are among the most common health problems, yet conventional medicine makes no reference to them, nor does it have a way to diagnose these conditions. Liver enzyme levels in the blood become elevated only when there is advanced liver cell destruction, as is the case, for example, in hepatitis or liver inflammation. Liver cells contain large amounts of enzymes. When ruptured, the enzymes enter the blood and signal liver abnormalities. But by then, the damage has already occurred. It takes many years of congestion before such an event becomes possible. Therefore, typical clinical tests are not a reliable way to detect gallstones in the liver.