system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we and other animals get so excited for food, but not so much for water, even though thirst is a more immediate concern?
gpt
Food generally requires more effort to get than water. Generally, you have a known water source, but you have to hunt or gather for food. If you don't have a water source, then that does become the immediate concern, but you can get some amount of water from food too. 

Thirst can get desperate and will kill you faster than hunger, but water is still either available or not. Food is still more complicated to acquire.