The reference
intake for one portion intake was decided considering the
median value of 24 h recall method, and then divided into ‘less’
(0.5 times), ‘normal’, and ‘more’ (1.5 times) [11]; for some foods,
the portion size was presented with pictures showing their actual
size. The frequency was divided into nine levels including
‘twice a day’ to ‘less than once a month’.