Do implementation intentions help to eat a healthy diet? A systematic review and meta-analysis of the empirical evidence

*Achtziger, 2008, Implementation intentions and shielding goal striving from unwanted thoughts and feelings, Personality and Social Psychology Bulletin, 34, 381, 10.1177/0146167207311201 *Adriaanse, 2009, Finding the critical cue. Implementation intentions to change one's diet work best when tailored to personally relevant reasons for unhealthy eating, Personality and Social Psychology Bulletin, 35, 60, 10.1177/0146167208325612 *Armitage, 2004, Evidence that implementation intentions reduce dietary fat intake. A randomized trial, Health Psychology, 23, 319, 10.1037/0278-6133.23.3.319 Armitage, 2006, Evidence that implementation intentions promote transitions between the stages of change, Journal of Consulting and Clinical Psychology, 74, 141, 10.1037/0022-006X.74.1.141 *Armitage, 2007, Effects of an implementation intention-based intervention on fruit consumption, Psychology and Health, 22, 917, 10.1080/14768320601070662 *Chapman, 2009, Comparing implementation intention interventions in relation to young adults’ intake of fruit and vegetables, Psychology and Health, 24, 317, 10.1080/08870440701864538 Cohen, 1988 *De Nooijer, 2006, Do implementation intentions help to turn good intentions into higher fruit intakes?, Journal of Nutrition Education & Behavior, 38, 25, 10.1016/j.jneb.2005.11.021 *De Vries, 2008, The effectiveness of tailored feedback and action plans in an intervention addressing multiple health behaviors, American Journal of Health Promotion, 22, 417, 10.4278/ajhp.22.6.417 Gandini, 2000, Meta-analysis of studieson breast cancer risk and diet. The role of fruit and vegetable consumption and the intake of associated micronutrients, European Journal of Cancer, 36, 636, 10.1016/S0959-8049(00)00022-8 Gollwitzer, 1999, Implementation intentions. Strong effects of simple plans, American Psychologist, 54, 493, 10.1037/0003-066X.54.7.493 Gollwitzer, 2006, Implementation intentions and goal achievement. A meta-analysis of effects and processes, Advances in Experimental Social Psychology, 38, 69, 10.1016/S0065-2601(06)38002-1 Gollwitzer, 2005, The control of the unwanted, 485 *Gratton, 2007, Promoting children's fruit and vegetable consumption. Interventions using the Theory of Planned Behaviour as a framework, British Journal of Health Psychology, 12, 639, 10.1348/135910706X171504 Holland, 2006, Breaking and creating habits on the working floor. A field-experiment on the power of implementation intentions, Journal of Experimental Social Psychology, 42, 776, 10.1016/j.jesp.2005.11.006 Hooper, 2001, Dietary fat intake and prevention of cardiovascular disease. A systematic review, BMJ, 322, 757, 10.1136/bmj.322.7289.757 *Jackson, 2005, Beyond intention. Do specific plans increase health behaviours in patients in primary care? A study of fruit and vegetable consumption, Social Science and Medicine, 60, 2383, 10.1016/j.socscimed.2004.10.014 *Kellar, 2005, Randomized controlled trial of a brief research-based intervention promoting fruit and vegetable consumption, British Journal of Health Psychology, 10, 543, 10.1348/135910705X42940 Koestner, 2006, Bolstering implementation plans for the long haul. The benefits of simultaneously boosting self-concordance or self-efficacy, Personality and Social Psychological Bulletin, 32, 1547, 10.1177/0146167206291782 Kumanyika, 2000, Maintenance of dietary behavior change, Health Psychology, 19, 42, 10.1037/0278-6133.19.Suppl1.42 Lipsey, 2001 *Luszczynska, 2009, Mediated effects of social support for healthy nutrition. Fruit and vegetable intake across 8 months after myocardial infarction, Behavioral Medicine, 35, 30, 10.3200/BMED.35.1.30-38 *Luszczynska, 2009, Changing nutrition physical activity, and body weight among student nurses and midwives effects of a planning intervention and self-efficacy beliefs, Journal of Healthy Psychology, 8, 1075, 10.1177/1359105309342290 *Luszczynska, 2007, Planning to change diet. A controlled trial of an implementation intentions intervention to reduce saturated fat intake among patients after myocardial infarction, Journal of Psychosomatic Research, 63, 491, 10.1016/j.jpsychores.2007.06.014 Luszczynska, 2007, Planning to lose weight. Randomized controlled trial of an implementation intention prompt to enhance weight reduction among overweight and obese women, Health Psychology, 4, 507, 10.1037/0278-6133.26.4.507 *Luszczynska, 2007, Improving fruit and vegetable consumption. A self-efficacy intervention compared with a combined self-efficacy and planning intervention, Health Education Research, 22, 630, 10.1093/her/cyl133 Milne, 2002, Combining motivational and volitional interventions to promote exercise participation. Protection motivation theory and implementation intentions, British Journal of Health Psychology, 7, 163, 10.1348/135910702169420 O’Brien, 2007, Nutrition knowledge and body mass index, Health Education Research, 22, 571, 10.1093/her/cyl119 Orbell, 1997, Implementation intentions and the theory of planned behavior, Personality and Social Psychological Bulletin, 23, 945, 10.1177/0146167297239004 *Otis, 2008, Women's regulation styles for eating behaviors and outcomes. The mediating role of approach and avoidance food planning, Motivation and Emotion, 32, 55, 10.1007/s11031-008-9083-3 Parks-Stamm, 2007, Action control by implementation intentions. Effective cue detection and efficient response initiation, Social Cognition, 25, 248, 10.1521/soco.2007.25.2.248 Parks-Stamm, 2010, Implementation intentions and test anxiety. Shielding academic performance from distraction, Learning and Individual Differences, 20, 30, 10.1016/j.lindif.2009.09.001 Prestwich, 2003, The use of implementation intentions and the decision balance sheet in promoting exercise behaviour, Psychology and Health, 18, 707, 10.1080/08870440310001594493 *Prestwich, 2008, Crossing two types of implementation intentions with a protection motivation intervention for the reduction of saturated fat intake. A randomized trial, Social Science and Medicine, 67, 1150 Renner, 2008, Social-cognitive predictors of dietary behaviors in South Korean men and women, International Journal of Behavioral Medicine, 15, 4, 10.1007/BF03003068 *Reuter, 2008, Dietary planning as a mediator of the intention behaviour relation. An experimental causal chain design, Applied Psychology, 57, 194, 10.1111/j.1464-0597.2008.00364.x Rise, 2003, Measuring implementation intentions in the context of the theory of planned behavior, Scandinavian Journal of Psychology, 44, 87, 10.1111/1467-9450.00325 Rosenthal, 1979, The ‘file-drawer problem’ and tolerance for null results, Psychological Bulletin, 86, 638, 10.1037/0033-2909.86.3.638 *Scholz, 2009, Changes in self-regulatory cognitions as predictors of changes in smoking and nutrition behaviour, Psychology and Health, 24, 545, 10.1080/08870440801902519 Schwarzer, 2007, Adoption and maintenance of four health behaviors. Theory-guided longitudinal studies on dental flossing, seat belt use, dietary behavior, and physical activity, Annals of Behavioral Medicine, 33, 156, 10.1007/BF02879897 Sheeran, 1999, Implementation intentions and repeated behaviour. Augmenting the predictive validity of the theory of planned behaviour, European Journal of Social Psychology, 29, 349, 10.1002/(SICI)1099-0992(199903/05)29:2/3<349::AID-EJSP931>3.0.CO;2-Y Sheeran, 2005, Implementation intentions, 276 *Sullivan, 2008, When planning is needed. Implementation intentions and attainment of approach versus avoidance health goals, Health Psychology, 27, 438, 10.1037/0278-6133.27.4.438 *Van Osch, 2009, Action planning as predictor of health protective and health risk behavior. An investigation of fruit and snack consumption, International Journal of Behavioral Nutrition and Physical Activity, 6 *Verplanken, 1999, Good intentions, bad habits, and effects of forming implementation intentions on healthy eating, European Journal of Social Psychology, 29, 591, 10.1002/(SICI)1099-0992(199908/09)29:5/6<591::AID-EJSP948>3.0.CO;2-H Webb, 2006, Does changing behavioral intentions engender behavioral change? A meta-analysis of the experimental evidence, Psychological Bulletin, 132, 249, 10.1037/0033-2909.132.2.249 Wiedemann, 2008, Prediction of stage transitions in fruit and vegetable intake, Health Education Research, 24, 596, 10.1093/her/cyn061 World Health Organization, 2010