Similarly , there was no clear evidence of effect for cardiovascular risk factors , although again the number of studies reporting these was small .
There was some evidence for beneficial effects on HRQOL , dietary outcomes , and physical activity , although firm conclusions can not yet be made .
The effects on healthcare utilisation and cost-effectiveness are also inconclusive , and trials are yet to measure the impact of  Internet interventions on compliance with medication .
BACKGROUND The Internet could provide a means of delivering secondary prevention programmes to people with coronary heart disease ( CHD ) .
OBJECTIVES To determine the effectiveness of Internet-based interventions targeting lifestyle changes and medicines management for the secondary prevention of CHD .
Promoting fruit and vegetable consumption. Testing an intervention based on the theory of planned behaviour
This study evaluated the efficacy of a theory of planned behaviour ( TPB ) based intervention to increase  fruit and vegetable consumption .  The extent to which fruit and vegetable consumption and change in intake could be explained by the TPB was also examined . Participants were r and omly assigned to two levels of intervention frequency matched for intervention content ( low frequency n=92 , high frequency n=102 ) . Participants received TPB-based email messages design ed to increase fruit and vegetable consumption , messages targeted attitude , subjective norm and perceived behavioural control ( PBC ) . Baseline and post-intervention measures of  TPB variables and behaviour were collected . Across the entire study cohort , fruit and vegetable consumption increased by 0.83 servings/day between baseline and follow-up . Intention , attitude , subjective norm and PBC also increased ( p<.05 ) . The TPB successfully modelled fruit and vegetable consumption at both time points but not behaviour change . The increase of fruit and vegetable consumption is a promising preliminary finding for those primarily interested in increasing fruit and vegetable consumption . However , those interested in theory development may have concerns about the use of this model to explain behaviour change in this context . More high quality experimental tests of the theory are needed to confirm this result
Similarly , there was no clear evidence of effect for cardiovascular risk factors , although again the number of studies reporting these was small .
There was some evidence for beneficial effects on HRQOL , dietary outcomes , and physical activity , although firm conclusions can not yet be made .
The effects on healthcare utilisation and cost-effectiveness are also inconclusive , and trials are yet to measure the impact of  Internet interventions on compliance with medication .
BACKGROUND The Internet could provide a means of delivering secondary prevention programmes to people with coronary heart disease ( CHD ) .
OBJECTIVES To determine the effectiveness of Internet-based interventions targeting lifestyle changes and medicines management for the secondary prevention of CHD .