system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: G-force - What is it and how does it injure/kill?

How does it affect our bodies?
gpt
G-Force is just a shorthand way of referring to a force using the force of gravity as a reference. 

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So 1G is the same as the force we feel due to gravity.  This feels like almost no force at all because we feel it act on us all the time. 2Gs would be twice the normal force of gravity and 3Gs would be 3 times the force etc.

It injures you and kills you the same way force from anything else would. It crushes you causing your internal organs to compact and your bones to break.