Social desirability bias in food type selection may influence patient
behaviour during diet history interviews; however, face to face diet
history interviews do not allow for participant behaviours to be captured.
To determine whether a relationship exists between the foods
selected by the participant and observed behaviours, video data was
analysed for n = 11 adult volunteers with type 2 diabetes mellitus using
an automated diet history website. Participant log files showing time
taken and item selection were downloaded from the website. Behaviours
from the videos and food item selections from the log files were
grouped, and matched for time of occurrence. The frequency and proportion of behaviours per food group were calculated. Trends
between food group and behaviour group were determined using
weighted chi-square analyses. Sixteen behaviour groups were constructed
from 155 behaviours and 11 food groups were formed.
Adjusted for voice alteration; the most commonly observed behaviour
was non-computer interaction in the savoury sauces (14.0%) group; self
touching of the face in the sugary foods (20.2%), and fats and oils
(16.9%) groups; shifting in the chair in the takeaway food group
(20.2%); and head movement (21.6%) in the alcoholic beverages group.
Self-touching of the face, head movement, postural movement, and
movement in chair were observed significantly more often than other
behaviours across all food groups. Food type appears to influence
behaviour during diet history interviews. This may have implications
for the types of questions asked by dietitians during face to face diet