system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] Do Chaos Marines still have to eat/sleep/etc. ?
gpt
Depends on the Chaos Marine and level of possession and corruption. Fairly uncorrupted marines have to eat and sleep as much as normal marines: very little.

Fully corrupted or possessed marines can draw energy directly from the warp or the daemon. Like anything Chaos: it varies.