Final answer:
The component of CBT that involves discouraging purging after eating is ERP (Exposure and Response Prevention).
Step-by-step explanation:
The component of CBT (Cognitive Behavior Therapy) that involves discouraging the patient from purging after eating foods that usually elicit an urge to vomit is E) ERP (Exposure and Response Prevention).
Exposure therapy is a component of CBT that aims to reduce anxiety and fear by gradually exposing the patient to the feared object or situation. In the case of bulimia nervosa, ERP would involve exposing the patient to the food that triggers the urge to vomit and preventing them from engaging in the purging behavior. Over time, this helps the patient learn to tolerate the anxiety and break the cycle of bingeing and purging.