A study by researchers at Brigham Young University found that examining carbon and nitrogen in the proteins of hair could reveal information about a person's day-to-day nutrition. Clinicians(臨床医)could use this as a tool to diagnose eating disorders such as anorexia(拒食症)or bulimia(過食症). These diseases are sometimes hard to diagnose because sufferers often lie about their habits or do not recognize their problems.