system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does food taste different when it's cold, room temperature or hot?
gpt
A substantial component of what we call taste is actually smell.  This is why food tastes really bland when your nasal passages are all stopped up because of a cold.  

A lot more smell particles come off of hot foods than cold foods.  This is why a pie baking in the oven will smell up the whole house, but a cold pie sitting on the counter is odorless.

So, because foods emit different amounts of odor at different temperatures, you taste them differently.