system
Given the following post, respond as if you're commenting on Reddit:
human
Since your liver regenerates, can you remove and freeze a chunk of your healthy liver at a young age, and then use it as a backup to regrow your liver later in life after it's been damaged?
gpt
Theoretically, but the real problem is that it’s very difficult to avoid damaging living tissues in the freezing process to the point where it’s unusable. Unless you have access to decent quantities of liquid nitrogen and a suitable storage environment, such as a large industrial dewar, ice crystals will inevitably form within the protein cells, bursting them and rendering your liver into a useless mess. 

You may have heard about tissues, organs, and even entire cadavers (such as Walt Disney’s head) being stored long-term in cryopreservation conditions (generally -196°C, which neutralises enzymatic and other chemical processes) in the hope that one day, the technology and expertise will exist to return them to life. There are all kinds of complications though, such as the necessity for introducing cryoprotectants to protect against intracellular crystal formation. There are also solution effects - as ice forms, solutes remain suspended in the non-frozen portion and thus dramatically increase in concentration, which can make even simple salts and sugars highly toxic. 

The sad truth is that it’s *extremely doubtful* that any of these frozen tissues will ever be viable, for the fact that it’s near impossible to get and keep them at such low temperatures without damage. 

A better way would be to combine your liver with water and sliced onion. Bring to a boil, reduce heat to low, and cover. Simmer for about 20 minutes, or until liver is cooked and tender. Remove from heat, drain, and discard onions. Also remove and discard any hard portions of the liver.

Place cooked livers in a blender or food processor, and process until smooth. Add chopped onion, sherry, butter or margarine, salt, black pepper, and mace; pulse to blend. With hands lightly greased, form pate mixture into a mound, and place on a serving platter. Chill for 1 hour before serving.