system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When people are frozen cryogenically in the hopes of being revived in the future, what happens to their body tissue, especially in the brain?

I was thinking about this the other day and the way my thought process went was like this:

People get cold --> they get frostbitten.

People get frozen via cryogenics --> wouldn't they have even more damage because of the extended exposure to cold? And is there any evidence that says our brains will function normally after days/weeks/months/years in a cryogenic stasis?
gpt
If you freeze quickly enough, ice crystals won't form in the same way, and thus damage (which is typically caused by ice crystals in cellular fluids puncturing cell walls) is minimized, even eradicated. However, we have not quite yet reached that level of freezing; what we have now is an approximation that we think will be reversible sometime in the future.