Weight phobia
The term weight phobia might refer or relate to:

 Fatphobia, also known as obesophobia, prejudicial assumptions that are based on an assessment of a person as being overweight or obese
 Anorexia nervosa, an eating disorder in which people avoid eating due to concerns about body weight or body image
 Bulimia nervosa, an eating disorder in which people show an excessive concern with body shape and weight