> eating <culturally preferred food> when sick to get better faster.
Some of these are more than just tradition. I'm familiar with having different kinds of soups or maybe eating spicy things. Having soup increases your liquid intake which generally helps your body process stuff (you could of course just drink lots of water, but that's not very culturally significant), spicy things can increase sinus drainage which is helpful too.
My favorite broken-logic joke about this is that a (pick your favorite ethnicity) grandmother owned two chickens, but one day, one of them got sick. So she killed the healthy chicken and made soup to nurse the other one back to health.
Some of these are more than just tradition. I'm familiar with having different kinds of soups or maybe eating spicy things. Having soup increases your liquid intake which generally helps your body process stuff (you could of course just drink lots of water, but that's not very culturally significant), spicy things can increase sinus drainage which is helpful too.