Does rejection sensitivity in ADHD play a role in stress eating?

It plausibly can. Rejection sensitive dysphoria (the intense emotional response to perceived rejection or criticism some people with ADHD describe) can trigger significant emotional distress, and food is a common coping mechanism people reach for during acute emotional distress generally. This connection is based on how RSD and stress eating each individually relate to emotional coping rather than a specific formal study linking the two directly. References: https://obesitycanada.ca/healthcare-professionals/adult-clinical-practice-guideline/