The group operates 15 specialist units which treat eating disorders and has revealed that a growing number of its patients are men.
Experts are concerned that many men have avoided seeking treatment for their eating disorder because they believe anorexia, bulimia and compulsive eating to be "women's disorders".
However, they want the taboo to be lifted so that men feel able to seek the treatment they need.
Dr Alex Yellowlees, medical director from the Priory Hospital Glasgow, revealed: "Eating disorders are more prominent in women, but male eating disorders are more common than many think.
"Men are susceptible to the cultural and media demands for perfect bodies, just as women are."
The Priory Group also provides treatment for people with addictions, depression and other mental health issues.