Final answer:
Bran's behavior where he creates reasons why he cannot stick to his diet plan and workout regime is known as Self-sabotage.
Step-by-step explanation:
Bran is exhibiting behavior known as Self-sabotage. This term refers to the actions or thoughts that undermine one's success despite one's own wishes or goals. Bran creates reasons not to stick to his diet and workout regime and blames external factors, essentially setting himself up for failure because he fears the disappointment that may come from not achieving his weight loss goal.
This type of behavior could be related to underlying issues with self-esteem, fear of failure, or difficulties in managing stress and emotions related to lifestyle changes.