HR_p wrote:Are there eating habits, such as meal timing or vegetarianism, that are more common in NPD individuals?
You're on the right track, but you're approaching from the wrong angle. Google eating disorders and narcissism.
Based on meta-analysis of Cassin & Ranson, 2005, narcissistic personality disorder is diagnosed in 2% to16% of eating disorder patients, with the lower estimate of 2% arising from the more reliable assessment procedures.
Research suggests that bulimic attitudes and behaviors are associated with classic narcissistic personality traits (Brunton, Lacey, and Waller, 2005), and that restrictive eating is associated with the “poor me” form of narcissism in which others are viewed as abusive and the individual must, like a martyr, place the needs of others first (Brunton, Lacey, and Waller, 2005). As such, there is evidence that narcissistic wounding is indeed related to eating disorder development and maintenance. Below we explore the concept of narcissistic wounding in relation to eating disorders
HR_p wrote:For example, do many NPD folks eat snacks and meals at exactly the same time each day?
I do, because I'm comfortable with routine. Discipline is less of a factor in this trait.
HR_p wrote:Is being a strict - almost religious - vegetarian, more common?
This would be in line with orthorexia. I am very strict with what I eat, and have been so since I was 19. My choice is not based on ethical reasons, it's simply vanity. I've noticed that eating disorders such as bulemia, and anorexia, tend to be common in certain types of BPD, and orthorexia, excessive exercise, and "Bigorexia" tend to be more prevalent in certain types of NPD. Probably some OCD in there too.