The psychological disorders are mainly due to abnormal alterations in neurotransmitter levels in central nervous system. Seratonin, dopamine, adrenaline can alter motor and behavioural activities in the central nervous system.
Anorexia nervosa is an eating disorder mainly caused by defects in gray matter and low brain mass. It simply referred as Anorexia, a common nutritional distress during adolescence. People with this disorder don’t eat because they fear of becoming fatty.
Bulimia nervosa is referred as the eating abnormally through binging, followed by vomiting. It is more common compared to anorexia nervosa.
Thus, the options (b), (a) and (d) are incorrect.
Anorexia nervosa is an eating disorder mainly caused by defects in gray matter and low brain mass.
Therefore, the correct option is – c. Loss of gray matter and reduced brain mass.