Why does food noise seem to get louder specifically when ADHD medication wears off?

This tracks with the general pattern of stimulant medications wearing off. As the appetite-suppressing and focus-supporting effects fade, both hunger and intrusive/racing thoughts (including food-related ones) commonly return, sometimes described as returning "all at once" rather than gradually. It's consistent with how a lot of ADHD symptoms broadly are described as more noticeable during the medication's off-hours rather than something unique to food specifically. References: https://obesitycanada.ca/healthcare-professionals/adult-clinical-practice-guideline/