Why does everyone in anime always fart like this whenever food is mentioned?

Why does everyone in anime always fart like this whenever food is mentioned?
Is this like a Japanese custom or something that I just don't understand?

Maybe it's just me, but it just seems so weird that someone will be speaking, and then suddenly they'll just let out a really long, protracted fart, and someone else will go "Haha, guess it's time for curry!" or something, like it's the most normal thing in the world...

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Fart fetishists should be electrocuted.

Fart fetishists should be gassed.

It isn't a fart, it's a tummy rumble. No gas is emitted out of the anus. You've never had your tummy rumble when you're hungry before?

user you make me so angry

Not so loud and continuous that others take note of it.
Are you sure it's not just a custom for the Japanese to fart as a show of hunger?

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Retarded people make me angry too and I don't even really know why.

Stop taking everything so seriously and just have a gas, user.

Unlike Americans the Japanese don't eat 6 meals a day they eat 3 at the most and it's mostly fish or rice which doesn't fill you up unless you eat like fucking Goku.

tl;dr the stomach grumble is a Japanese meme because they're always hungry

It seems like it's the same stomach grumble sound effect in every single anime.