zahra sohrabi school of nutrition and food sciences, shiraz university of medical sciences, shiraz, ir iran mohammad hassan eftekhari clinical nutrition department, school of nutrition and food sciences, shiraz university of medical sciences, shiraz, ir iran; clinical nutrition department, school of nutrition and food sciences, shiraz university of medical sciences, shiraz, ir iran. tel: +98-7137251002, fax: +98-7137257288 mohammad hadi eskandari department of food science and technology, school of agriculture, shiraz university, shiraz, ir iran abbas rezaeianzadeh department of epidemiology, school of health, shiraz university of medical sciences, shiraz, ir iran mohammad mahdi sagheb department of nephrology, school of medicine, shiraz university of medical sciences, shiraz, ir iran