It is impossible for normal life to exist without a liver that is functioning up to par. The liver has primary responsibility for eliminating most toxins from the body; hence, its failure will lead to build up of these toxins in the body and inevitably, a slow painful death will ensue.
Even though the liver acts as the policeman against toxins in the body, there are toxins that are destructive even to the liver itself. The liver has the capacity to regenerate itself; however this is highly dependent on the damage that has occurred to the liver cells. If possible, avoiding insults that will result in direct damage to the liver will be of great benefit to the vital organ.