system
Given the following post, respond as if you're commenting on Reddit:
human
[Canon] How are the giants from GoT able to sustain their body mass in an area with little food?
gpt
Large animals can definitely survive in cold lands.  There is probably more food up there than you think just little for large immobile cities.  Slow metabolism is most likely a part as well as a broad omnivorous diet.  But think of polar bears, moose, wooly mammoths, etc.  All live in similar climes and are quite large.