system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does dehydration make you think you're hungry, when in reality you need more water?
gpt
Pure liquid water is not the only source of hydration, fruits and vegetables can also be sources. During evolutionary history there were plenty of times where the liquid stuff was not available but food was still available. Increasing hunger can thus encourage getting other forms of water.