Ajzen, I., & Fishbein, M. (1980). Understanding atti-tudes and predicting social behavior. Englewood Cliffs, NJ: Prentice Hall.
 Ajzen, I. (1991). The theory of planned behavior. Organizational Behavior and Human Decision Processes, 50, 179-211.
 Armitage, C. J. (2005). Can the theory of planned behavior predict the maintenance of physical activity? Health Psychology, 24, 235-245.
 Becker, M. H., & Rosenstock, I. M. (1984). Compliance with medical advice. In: A. Steptoe and A. Matthews (Ed.), Health care and human behav-ior, pp. 135-152. London, UK: Academic Press.
 Blumberg, S. J., Luke, J. V., Ganesh, N., Davern, M. E., Boudreaux, M. H. (2012). Wireless subs-titution: State-level estimates from the national health interview survey, 2010-2011. U.S. Department of Health and Human Services. Center of Disease Control and Prevention, National Health Statistics Report Number 61. Bethesda, DC: CDC.
 Boulous, M. N., Wheeler, S., Tavares, C., & Jones, R. (2011). How smartphones are changing the face of mobile and participatory healthcare: An overview, with example from eCAALYX. BioMedical Engineering OnLine, 10: 24.
 DiClemente, C. C., Prochaska, J. O., Fairhust, S. K., et al. (1991). The process of smoking cessation: An analysis of precontemplation, contemplation, and preparation stages of change. Journal of Consulting and Clinical Psychology, 59, 295-304.
 Free, C., Phillips, G., Felix, L., Galli, L., Patel, V., & Edwards, P. (2010). The effectiveness of M-health technologies for improving health ?and health services: a systematic review protocol. BMC Research Notes 2010, 3:250.
 Hall, K. (2012). Diet versus exercise in “the biggest loser” weight loss competition. Obesity, DOI 10.1002/oby.20065
 Huang, A. Barzi, F., Huxley, R. Denyer, G., Rohrlach, B., Jayne, K., & Neal, B. (2006). The effects onsaturated fat purchases of providing Internet shoppers with purchase-specificdietary advice: a randomized trial. PLoS Clinical Trials, 1:e2.
 International Telecommunication Union (2010). Measuring the Information Society. Geneva, Switzerland: ITU.
 IctQatar, Supreme Council of Information and Communication Technology (2009). Qatar’s ICT Landscape: Assessment of Information, Communication and Technology in Qatar. http://www.ictqatar.qa/ landscape2009/index_en.htm. Last visit 26 November 2010.
 Mozaffarian, D., Hao, T., Rimm, E. B., Willet, W. C., & Hu, F. B. (2011). Changes in diet and Lifestyle and Long-Term Weight Gain in Women and Men. N Engl J Med, 364, 2392-2404.
 Murray, M. & McMillan, C. (1993). Health beliefs, locus of control, emotional control and women’s cancer screening behavior. British Journal of Clinical Psychology, 32, 87-100.
 Patrick, K., Raab, F., Adams, M. A., Dillon, L., Zabinski, M., Rock, C.L., Griswold, W.G., & Norman, G.J. (2009). A Text Mes-sage–Based Intervention for Weight Loss: Randomized Controlled Trial. J Med Internet Res, 11(1):e1. DOI 10.2196/jmir.1100.
 Prochaska, J. O., & DiClemente, C. C. (1984). Self change processes, self efficacy and decisional balance across five stages of smoking cessa-tion. Advances in Cancer Control – 1983, pp. 131-140. New York, NY: Alan R. Liss, Inc.
 Prochaska, J. O., Velicer, W. F., Rossie, J. S., Goldstein, M. G., Markus, B., Rakowski, W., Fiore, C., Harlow, L. L., Redding, C. A., Rosenbloom, D., & Rossi, S. R. (1994). Stages of change and decional balance for 12 problem behaviors. Health Psychology, 13, 39-46.
 Schwarzer, R. (1992). Self-efficacy in the adoption and maintenance of health behaviors: Theoretical approaches and a new model. In: R. Schwarzer (ed.), Self-efficacy: Thought control of action. Washington, DC: Hemisphere.
 Schwarzer, R., Luszcynska, A., & Ziegelmann, P. (2008). Social-cognitive predictors of physical exercise adherence: Three longitudinal studies in rehabilitation. Health Psychology, 27, 854-863.
 Shaw, J. E., Sicree, & Zimmet, P. Z. (2010). Global estimates of the prevalence of diabetes for 2010 and 2030. Diabetes Research and Clinical Practice, 87, 4–14.
 Webb, T., Joseph, J., Yardley, L., & Michie, S. (2010). Using the Internet to promote health behavior change: A sys-tematic review and meta-analysis of the impact of theo-retical basis, use of behavior change techniques, and mode of delivery on efficacy. J Med Internet Res,12, 1:e4. DOI: 10.2196/jmir.1376.
 World Health Or-ganization (2010). Global status report on noncommu-nicable diseases. Geneva, Switzerland: WHO Press.