The crunch sound of food makes your brain think it’s more satisfying, so louder crunching makes you want to eat more.
Evidence from Studies
Supporting (1)
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Food Intake Recruits Orosensory and Post-ingestive Dopaminergic Circuits to Affect Eating Desire in Humans.
When you chew food, your brain releases dopamine—the 'reward' chemical—that makes you feel good and influences how full you feel. This study shows that these brain reactions help decide how much you eat, supporting the idea that chewing sounds and taste affect your hunger through your brain's reward system.
Contradicting (2)
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The study looks at how tasty food and stress change brain chemicals related to pleasure and eating, but it doesn’t study whether the sounds you hear while chewing affect how full you feel or how much you eat later.
This study found that stimulating a specific brain area with a drug makes hungry rats eat more, but it didn’t involve sounds, chewing, or how food feels in the mouth — so it doesn’t prove that chewing sounds affect how full you feel.