Introduction: Anorexia nervosa is characterized by a strong focus on body weight and a strong desire to lose weight. The disease leads to extreme anxiety and constant thoughts about diet and body weight. Currently, there are still no clear guidelines and scientific evidence for the treatment of Anorexia Nervosa with a special method. The evidence for the effectiveness of different treatments is weak and lacks empirical support. Therefore, there is a need to document and study the effectiveness of existing treatment methods for Anorexia Nervosa. Aim: The study aims to study the efficacy of CBT in the treatment of Anorexia nervosa. Method: A literature study was conducted where five studies about CBT as treatment and it’s efficacy for Anorexia nervosa was studied. Result: CBT as a single treatment at Anorexia Nervosa leads to an increase in BMI and a decrease in the eating disorder's psychopathology. Conclusion: CBT is a potent treatment that can be used advantageously in the treatment of Anorexia nervosa, but further research is needed in the field with, among other things, several studies comparing CBT with other treatment methods.