It is apparent that personality is related to the patho genesis of obe
sity, and that understanding the personality of the patient may be a k
ey to successful treatment of the disease. Using the Rorschach test an
d interviews by a psychiatrist, the types of personality were classifi
ed into four groups according to the healthiness of personalities. The
judgment of healthiness was based mainly on the scores obtained from
the Rorschach test This classification revealed that the occurrence of
mental and physical symptoms during therapy with a very low calorie d
iet (VLCD) and subsequent rebound of bodyweight were more frequently o
bserved in patients with relatively less healthy personalities, We use
d this classification to adapt our program to treat obese patients. In
this program severe diet restrictions were applied to patients with r
elatively healthy personalities. These restrictions were applied with
modifications to patients with less healthy personality, because sever
e restrictions would be possibly very stressful for them and would bri
ng about an undesirable reaction. For strengthening the patients' moti
vation for therapy, the significance of body weight reduction was expl
ained in different ways to patients with different types of personalit
y. The target of body weight reduction, reward for patients with succe
ssful weight reduction, and, the duration of therapy were setup differ
ently for patients with different personalities types. The results sho
wed that body weight rebound one or two years after treatment was redu
ced with the personality-oriented therapy program compared to that obs
erved with the previous conventional therapies. Also, the incidence of
psychological problems was remarkably decreased.