system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does salt "bring out the flavor" of food?
gpt
Salt tends to reduce our perception of bitterness in foods.  By reducing the bitterness perception it actually increases our perception of not only the salt but the other flavors in the food that we can detect: sweet, sour, and umami (savory flavor).  This brings out 4 of our major 5 tastes while reducing one that is often undesirable.  Of course too much salt eventually overtakes those other flavors as well, so the amount of salt is very important.

There is also the fact that we crave salt in order to get the sodium we need to survive.  Meeting that craving adds to our enjoyment of foods.