system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is chicken soup good for you when you're sick?
gpt
When you're sick, even though you feel awful, it's important that you get plenty of fluids and plenty of your body's normal nutritional needs - calories, protein, vitamins, sodium, etc.  And if you're congested (like you would be with lots of common illnesses, say a cold or a flu), then you're not going to have much of a sense of taste or smell, so food won't be all that appetizing to you.

Soup, since it's mostly hot liquid, produces steam to help open up your passageways and allow you to smell and taste your food.  And chicken soup specifically has everything your body needs - plenty of sodium, fat, and protein from the chicken broth and meat itself, and then usually vitamins from the carrots, celery, and whatever else is in there.  So in one bowl you have an appetite enhancer, fluids, and all of the major food requirements that your body needs.