The main types are ‘anorexia nervosa and binge-eating and usually develop during adolescence or early adulthood’ (Natl. Inst. Of Mental Health). This disorder usually ‘co-occurs with psychiatric disorders like substance abuse, anxiety disorder and depression’ (American Psychiatric Association 2000). People with anorexia consider themselves as overweight although they are already the opposite. They tend to avoid food and meals, become picky and eat only in small quantities. They constantly check their body weight and engage in weight control techniques like too much exercise or ‘purging by means of vomiting and abuse of laxatives, enemas, and diuretics’ (American Psychiatric Association 2000). On the other hand, binge-eaters eat until over full, eat large amounts even though not hungry and don’t practice purging so they become overweight for their age and height. Some of the physiological myths about hunger and satiety include a common belief that our blood glucose levels affect our hunger and satiety. But research shows that this is untrue because ‘glucose levels remain fairly stable and do not fluctuate often’ (Stier 2009). Also, they say that our energy levels drop along with our blood glucose and this trigger hunger so we should eat again to restore our levels back to the standard energy level.