**Core Concept**
Bulimia nervosa is a complex eating disorder characterized by recurrent episodes of binge eating, followed by compensatory behaviors such as self-induced vomiting, laxatives, or excessive exercise. This disorder is often associated with feelings of guilt, shame, and self-criticism.

**Why the Correct Answer is Right**
The binge-purge cycle in bulimia nervosa is a maladaptive attempt to cope with emotional distress. Individuals with bulimia nervosa often exhibit a distorted body image and an intense fear of gaining weight. This fear can lead to restrictive eating patterns, followed by episodes of binge eating, and subsequently, purging behaviors. The hypothalamic-pituitary-adrenal (HPA) axis is often dysregulated in individuals with bulimia nervosa, contributing to the development of this disorder.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because bulimia nervosa is indeed characterized by a restrictive eating pattern, followed by episodes of binge eating. The restrictive eating pattern is a key feature of the disorder.
* **Option B:** This option is incorrect because bulimia nervosa is not typically associated with a fear of gaining weight due to obesity. The fear of gaining weight in bulimia nervosa is often driven by a fear of losing control or becoming "fat."
* **Option C:** This option is incorrect because bulimia nervosa is not typically associated with a lack of self-esteem. In fact, individuals with bulimia nervosa often experience significant self-esteem disturbances, including feelings of guilt, shame, and self-criticism.

**Clinical Pearl / High-Yield Fact**
Individuals with bulimia nervosa often exhibit a "normal" or even "low" body mass index (BMI), which can make it challenging to diagnose the disorder. Clinicians should be aware of the subtle signs and symptoms of bulimia nervosa, including episodes of binge eating, purging behaviors, and significant self-esteem disturbances.

**Correct Answer: B. This option is incorrect because bulimia nervosa is not typically associated with a fear of gaining weight due to obesity.