The aim of the present study was to examine the predictive
utility of the TPB in the context of eating foods low in saturated fats
among a sample of people diagnosed with chronic illness (Type 2
diabetes and/or CVD). In addition, the role of planning in
determining people’s adherence to the consumption of foods
low in saturated fats was examined. There was some evidence in
support of the study’s predictions as attitudes and subjective
norms (but not PBC) predicted people’s intentions to eat foods low
in saturated fats. In addition, intention and PBC were found to
be predictive of the consumption of foods low in saturated fats at 1-month follow-up. However, further analyses revealed that the
effects of intention and PBC on behaviour were both mediated by
planning. Thus, the findings suggest that it is the extent of planning
people have undertaken that directly influences self-reported
eating of foods low in saturated fats and that this planning
mediates the effects of intentions and PBC on subsequent eating
behaviour.