Dietary behavior of home-living older adults: the role of environmental factors
Keywords:
malnutrition, underernæring, older adults, geriatriSynopsis
While many home-living older adults seem to consume a nutritionally adequate diet, the prevalence of malnutrition in older people living at home remains high and frequently overlooked. Malnutrition in older adults has been recognized as a challenging health concern associated with a decline in health, reduced physical and cognitive function, increased utilization of health services, slower recovery times, premature institutionalization, and increased mortality. The problems that exist in relation to malnutrition, coupled with the increased proportion of older adults in the population, will affect not only the older adults themselves but also has serious implications on health services, public finances, and welfare systems.
In response to these growing concerns, effort should be made to help older adults maintain their health. Research evidence increasingly supports the idea that an adequately nutritious sound diet is essential to the health of older adults. It is thus important to understand the dietary behavior of home-living older adults, particularly what factors impact this behavior. The recognition of the importance of understanding dietary behavior has sparked interest in research about these factors. That said, it often focuses solely on the individual-level determinants. Research focusing on environmental determinants of dietary behavior, on the other hand, is growing, but much still remains to be explored. For this reason, this dissertation centered on the environmental determinants of dietary behavior.
The main objective of this dissertation is to deepen our understanding of home-living older adults' dietary behavior and advance the current state-of-art literature in this field. This objective is achieved by means of three small interrelated studies. Before proceeding with the studies, I would like to point out the rationale behind them.
Many empirical studies in dietary behavior research use in-depth individual interviews as the data collection method. Despite the benefits of in-depth individual interviews as a data collection method, using a single data source to investigate a complex dietary behavior is perhaps insufficient. Additionally, it can result in mono-method bias. To create a good foundation for the studies and improve the overall validity of the findings, I first draw my attention to the data collection method (study 1) before focusing on identifying the environmental factors that impact dietary behavior (study 2). In terms of study 3, the second study's findings guided this study. The paragraphs below describe the three studies.
The first study explored the suitability of data collection methods for use with home-living older adults in the context of food choice. The second study investigates environmental factors determining home-living older adults' eating behavior. The third study examines the role of situational factors and the extent to which they lead to the adoption of online grocery shopping.
The result of the first study shows that the dyadic interview is a viable method for collecting data from older adults when an alternative interview method is needed. It also indicated that both interview methods generated complementary information. Moreover, using multiple methods has provided greater insights and perspectives about the topic.
The findings of study two suggest that a social environment can help encourage healthy eating among home-living older adults. Additionally, participation in a senior center, ensuring access to food (grocery shopping), transportation and mobility aids can support home-living older adults in maintaining their diet and health.
The third study found that a combination of poor health, loss of mobility, and distance to the grocery store can create a complex process that hinders older adults' endeavors to obtain healthy food. While some older adults have already adopted online grocery shopping as part of their routines, others are open to the idea as a coping strategy, but some are still hesitant.
Taken together, this dissertation contributes to unique insights into data collection methods for use with older adults when exploring food choice, deepens the knowledge of environmental factors associated with eating behavior, and enriches the understanding of situational factors that lead older adults to buy groceries online. The findings carry implications for methodology, theory, and practice within dietary behavior research of home-living older adults.
References
Allen, R. S., Haley, P. P., Harris, G. M., Fowler, S. N., & Pruthi, R. (2011). Resilience: definitions, ambiguities, and applications. Resilience in Aging, 1-13.
https://doi.org/10.1007/978-1-4419-0232-0_1
Alvesson, M., & Sköldberg, K. (2017). Reflexive Methodology: New Vistas for Qualitative Research (3. ed). Los Angeles, CA: SAGE Publications Ltd.
Amarya, S., Singh, K., & Sabharwal, M. (2015). Changes during aging and their association with malnutrition. Journal of Clinical Gerontology and Geriatrics, 6(3), 78-84.
https://doi.org/10.1016/j.jcgg.2015.05.003
Amarya, S., Singh, K., & Sabharwal, M. (2018). Aging process and physiological changes. Gerontology, 3-24.
https://doi.org/10.5772/intechopen.76249
Armat, M. R., Assarroudi, A., Rad, M., Sharifi, H., & Heydari, A. (2018). Inductive and deductive: ambiguous labels in qualitative content analysis. The Qualitative Report, 23(1), 219-221.
https://doi.org/10.46743/2160-3715/2018.2872
Badgaiyan, A. J., & Verma, A. (2015). Does urge to buy impulsively differ from impulsive buying behaviour? Assessing the impact of situational factors. Journal of Retailing and Consumer Services, 22, 145-157.
https://doi.org/10.1016/j.jretconser.2014.10.002
Baltes, M. M. (1996). The Many Faces of Dependency in Old Age: Cambridge University Press.
Bell, S., & Menec, V. (2015). "You don't want to ask for the help" The imperative of independence: is it related to social exclusion? Journal of Applied Gerontology, 34(3), NP1-NP21.
https://doi.org/10.1177/0733464812469292
Belon, A. P., Nieuwendyk, L. M., Vallianatos, H., & Nykiforuk, C. I. (2016). Perceived community environmental influences on eating behaviors: a photovoice analysis. Social Science & Medicine, 171, 18-29.
https://doi.org/10.1016/j.socscimed.2016.11.004
Bisogni, C. A., Falk, L. W., Madore, E., Blake, C. E., Jastran, M., Sobal, J., & Devine, C. M. (2007). Dimensions of everyday eating and drinking episodes. Appetite, 48(2), 218-231.
https://doi.org/10.1016/j.appet.2006.09.004
Blaikie, N., & Priest, J. (2019). Designing Social Research: The Logic of Anticipation (3 ed): Politi Press.
Bostic, S. M., & McClain, A. C. (2017). Older adults' cooking trajectories: shifting skills and strategies. British Food Journal, 119, 1102-1115.
https://doi.org/10.1108/BFJ-09-2016-0436
Bracht, G. H., & Glass, G. V. (1968). The external validity of experiments. American Educational Research Journal, 5(4), 437-474.
https://doi.org/10.3102/00028312005004437
Brombach, C., Landmann, M., Ziesemer, K., Bartsch, S., & Winkler, G. (2017). Healthy food choice and dietary behavior in the elderly. Nutrition and Functional Foods for Healthy Aging (pp. 101-110): Elsevier.
https://doi.org/10.1016/B978-0-12-805376-8.00011-3
Brug, J., Kremers, S. P., Van Lenthe, F., Ball, K., & Crawford, D. (2008). Environmental determinants of healthy eating: in need of theory and evidence: symposium on 'Behavioural nutrition and energy balance in the young'. Proceedings of the Nutrition Society, 67(3), 307-316.
https://doi.org/10.1017/S0029665108008616
Bukman, A. J., Ronteltap, A., & Lebrun, M. (2020). Interpersonal determinants of eating behaviours in Dutch older adults living independently: a qualitative study. BMC Nutrition, 6, 1-12.
https://doi.org/10.1186/s40795-020-00383-2
Burton-Jones, A. (2009). Minimizing method bias through programmatic research. MIS Quarterly, 3, 445-471.
https://doi.org/10.2307/20650304
Böcker, L., van Amen, P., & Helbich, M. (2017). Elderly travel frequencies and transport mode choices in Greater Rotterdam, the Netherlands. Transportation, 44(4), 831-852.
https://doi.org/10.1007/s11116-016-9680-z
Campbell, D. T., & Fiske, D. W. (1959). Convergent and discriminant validation by the multitrait-multimethod matrix. Psychological Bulletin, 56(2), 81-105.
https://doi.org/10.1037/h0046016
Caspi, C. E., Sorensen, G., Subramanian, S., & Kawachi, I. (2012). The local food environment and diet: a systematic review. Health & Place, 18(5), 1172-1187.
https://doi.org/10.1016/j.healthplace.2012.05.006
Clark, P. G. (1991). Ethical dimensions of quality of life in aging: autonomy vs. collectivism in the United States and Canada. The Gerontologist, 31(5), 631-639.
https://doi.org/10.1093/geront/31.5.631
Clarke, E., & Visser, J. (2019). Pragmatic research methodology in education: possibilities and pitfalls. International Journal of Research & Method in Education, 42(5), 455-469.
https://doi.org/10.1080/1743727X.2018.1524866
Conklin, A. I., Forouhi, N. G., Surtees, P., Khaw, K.-T., Wareham, N. J., & Monsivais, P. (2014). Social relationships and healthful dietary behaviour: evidence from over-50s in the EPIC cohort, UK. Social Science & Medicine, 100, 167-175.
https://doi.org/10.1016/j.socscimed.2013.08.018
Cook, T. D., & Campbell, D. T. (1979). Quasi-Experimentation: Design & Analysis Issues for Field Settings: Chicago: Rand-McNally.
Cook, T. D., Campbell, D. T., & Shadish, W. (2002). Experimental and Quasi-Experimental Designs for Generalized Causal Inference: Houghton Mifflin Boston, MA.
Creswell, J. W., & Creswell, J. D. (2017). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4. ed): Newbury Park, CA, SAGE Publications.
Crichton, M., Craven, D., Mackay, H., Marx, W., de van der Schueren, M., & Marshall, S. (2019). A systematic review, meta-analysis and meta- regression of the prevalence of protein-energy malnutrition: associations with geographical region and sex. Age and Ageing, 48(1), 38-48.
https://doi.org/10.1093/ageing/afy144
De Boer, A., Ter Horst, G. J., & Lorist, M. M. (2013). Physiological and psychosocial age-related changes associated with reduced food intake in older persons. Ageing Research Reviews, 12(1), 316-328.
https://doi.org/10.1016/j.arr.2012.08.002
Dean, M., Raats, M. M., Grunert, K. G., & Lumbers, M. (2009). Factors influencing eating a varied diet in old age. Public Health Nutrition, 12, 2421-2427.
https://doi.org/10.1017/S1368980009005448
DeBruyne, L. K., & Pinna, K. (2018). Nutrition for Health and Health Care (7ed): Cengage Learning.
Delormier, T., Frohlich, K. L., & Potvin, L. (2009). Food and eating as social practice-understanding eating patterns as social phenomena and implications for public health. Sociology of Health & Illness, 31(2), 215-228.
https://doi.org/10.1111/j.1467-9566.2008.01128.x
Domarad, B. R., & Buschmann, M. T. (1995). Interviewing Older Adults Increasing the Credibility of Interview Data. (vol.2 , pp. 14-20): SLACK Incorporated Thorofare, NJ.
https://doi.org/10.3928/0098-9134-19950901-06
Donini, L. M., Savina, C., & Cannella, C. J. (2003). Eating habits and appetite control in the elderly: the anorexia of aging. International Psychogeriatrics, 15(1), 73-87.
https://doi.org/10.1017/S1041610203008779
Doseděl, T., & Vidovićová, L. (2018). Who should interview older people? The effect of interviewer and interviewee characteristics in surveys of older people and aging topics. Sociológia, 6, 760-781.
https://doi.org/10.31577/sociologia.2018.50.6.28
Downe‐Wamboldt, B. (1992). Content analysis: method, applications, and issues. Health Care for Women International, 13(3), 313-321.
https://doi.org/10.1080/07399339209516006
Drewnowski, A. (1997). Taste preferences and food intake. Annual Review of Nutrition, 17(1), 237-253.
https://doi.org/10.1146/annurev.nutr.17.1.237
Dubois, A., & Gadde, L.-E. (2002). Systematic combining: an abductive approach to case research. Journal of Business Research, 55(7), 553- 560.
https://doi.org/10.1016/S0148-2963(00)00195-8
Edfors, E., & Westergren, A. (2012). Home-living elderly people's views on food and meals. Journal of Aging Research, 1-10.
https://doi.org/10.1155/2012/761291
Edwards, J. S., Meiselman, H. L., Edwards, A., & Lesher, L. (2003). The influence of eating location on the acceptability of identically prepared foods. Food Quality and Preference, 14(8), 647-652.
https://doi.org/10.1016/S0950-3293(02)00189-1
Elo, S., & Kyngäs, H. (2008). The qualitative content analysis process. Journal of Advanced Nursing, 62(1), 107-115.
https://doi.org/10.1111/j.1365-2648.2007.04569.x
Elsner, R. J. (2002). Changes in eating behavior during the aging process. Eating Behaviors, 3(1), 15-43.
https://doi.org/10.1016/S1471-0153(01)00041-1
Evans, C. (2005). Malnutrition in the elderly: a multifactorial failure to thrive. The Permanente Journal, 9(3), 38-41.
https://doi.org/10.7812/TPP/05-056
Falk, L. W., Bisogni, C. A., & Sobal, J. (1996). Food choice processes of older adults: a qualitative investigation. Journal of Nutrition Education, 28(5), 257-265.
https://doi.org/10.1016/S0022-3182(96)70098-5
Finkelstein, S. R., & Fishbach, A. (2010). When healthy food makes you hungry. Journal of Consumer Research, 37(3), 357-367.
https://doi.org/10.1086/652248
Fostinelli, S., De Amicis, R., Leone, A., Giustizieri, V., Binetti, G., Bertoli, S., Battezzati, A., Cappa, S. F. (2020). Eating behavior in aging and dementia: the need for a comprehensive assessment. Frontiers in Nutrition, 7, 1-9.
https://doi.org/10.3389/fnut.2020.604488
Furst, T., Connors, M., Bisogni, C. A., Sobal, J., & Falk, L. W. (1996). Food choice: a conceptual model of the process. Appetite, 26(3), 247-266.
https://doi.org/10.1006/appe.1996.0019
Gaskell, G., Bauer, M.W. (2000). Individual and group interviewing. Qualitative Researching with Text, Image and Sound. London: SAGE Publications Ltd.
https://doi.org/10.4135/9781849209731.n3
Gil-Montoya, J. A., De Mello, A. L. F., Barrios, R., Gonzalez-Moles, M. A., & Bravo, M. (2015). Oral health in the elderly patient and its impact on general well-being: a nonsystematic review. Clinical Interventions in Aging, 10, 461-467.
https://doi.org/10.2147/CIA.S54630
Glanz, K., Basil, M., Maibach, E., Goldberg, J., & Snyder, D. (1998). Why Americans eat what they do: taste, nutrition, cost, convenience, and weight control concerns as influences on food consumption. Journal of the American Dietetic Association, 98(10), 1118-1126.
https://doi.org/10.1016/S0002-8223(98)00260-0
Green, P. E., & Srinivasan, V. (1978). Conjoint analysis in consumer research: issues and outlook. Journal of Consumer Research, 5(2), 103-123.
https://doi.org/10.1086/208721
Green, P. E., & Srinivasan, V. (1990). Conjoint analysis in marketing: new developments with implications for research and practice. Journal of Marketing, 54(4), 3-19.
https://doi.org/10.1177/002224299005400402
Gubrium, J. F., Holstein, J. A., Marvasti, A. B., & McKinney, K. D. (2012). The SAGE Handbook of Interview Research: The Complexity of the Craft. Thousand Oaks, CA: SAGE Publications.
https://doi.org/10.4135/9781452218403
Guthrie, J. F., & Lin, B.-H. (2002). Overview of the diets of lower-and higher-income elderly and their food assistance options. Journal of Nutrition Education and Behavior, 34, S31-S41.
https://doi.org/10.1016/S1499-4046(06)60309-6
Hand, C., Riley, F. D. O., Harris, P., Singh, J., & Rettie, R. (2009). Online grocery shopping: the influence of situational factors. European Journal of Marketing, (43), 1205-1219.
https://doi.org/10.1108/03090560910976447
Hansen, T., & Solgaard, H. S. (2004). Measuring the effect of distance on consumer patronage behavior: a structural equation model and empirical results. New Perspectives on Retailing and Store Patronage Behavior: A study of the interface between retailers and consumers, 67-82.
https://doi.org/10.1007/1-4020-7955-9_5
Heale, R., & Twycross, A. (2015). Validity and reliability in quantitative studies. Evidence-Based Nursing, 18(3), 66-67.
https://doi.org/10.1136/eb-2015-102129
Herne, S. (1995). Research on food choice and nutritional status in elderly people: a review. British Food Journal, (97), 12-29.
https://doi.org/10.1108/00070709510100136
Higgs, S., & Ruddock, H. (2020). Social influences on eating. Handbook of Eating and Drinking: Interdisciplinary perspectives, 277-291.
https://doi.org/10.1007/978-3-030-14504-0_27
Holm, S. G., Mathisen, T. A., Sæterstrand, T. M., & Brinchmann, B. S. (2017). Allocation of home care services by municipalities in Norway: a document analysis. BMC Health Services Research, 17(1), 1-10.
https://doi.org/10.1186/s12913-017-2623-3
Host, A., McMahon, A.-T., Walton, K., & Charlton, K. (2016). Factors influencing food choice for independently living older people - a systematic literature review. Journal of Nutrition in Gerontology and Geriatrics, 35(2), 67-94.
https://doi.org/10.1080/21551197.2016.1168760
Hsieh, H.-F., & Shannon, S. E. (2005). Three approaches to qualitative content analysis. Qualitative Health Research, 15(9), 1277-1288.
https://doi.org/10.1177/1049732305276687
Huang, D. L., Rosenberg, D. E., Simonovich, S. D., & Belza, B. (2012). Food access patterns and barriers among midlife and older adults with mobility disabilities. Journal of Aging Research, 1-8.
https://doi.org/10.1155/2012/231489
Huertas-García, R., Nunez-Carballosa, A., & Miravitlles, P. (2016). Statistical and cognitive optimization of experimental designs in conjoint analysis. European Journal of Management and Business Economics, 25(3), 142-149.
https://doi.org/10.1016/j.redee.2015.10.001
Ishikawa, M., Yokoyama, T., Nakaya, T., Fukuda, Y., Takemi, Y., Kusama, K., Yoshiike, N., Nozue, M., Yoshiba, K., & Murayama, N. (2016). Food accessibility and perceptions of shopping difficulty among elderly people living alone in Japan. The Journal of Nutrition, Health & Aging, 20(9), 904-911.
https://doi.org/10.1007/s12603-015-0694-6
Jaul, E., & Barron, J. (2017). Age-related diseases and clinical and public health implications for the 85 years old and over population. Frontiers in Public Health, 5, 335, 1-7.
https://doi.org/10.3389/fpubh.2017.00335
Jeruszka-Bielak, M., Kollajtis-Dolowy, A., Santoro, A., Ostan, R., Berendsen, A. A., Jennings, A., Meunier, N., Marseglia, A., Caumon, Elodie., Gillings, R., De Groot, L., Franceschi, C., Hieke, S., & Pietruzka, B. (2018). Are nutrition-related knowledge and attitudes reflected in lifestyle and health among elderly people? A study across five European countries. Frontiers in Physiology, 9(994), 1-13.
https://doi.org/10.3389/fphys.2018.00994
Johnston, B. D. (2014). Sharing data collection instruments. In (20), pp.73: BMJ Publishing Group Ltd.
https://doi.org/10.1136/injuryprev-2014-041224
Keane, A., & Willetts, A. (1994). Factors that affect food choice. Nutrition & Food Science, (94), pp.15-17.
https://doi.org/10.1108/00346659310060142
Keese, M., Hirsch, D., & Bednarzik, R. (2006). Live longer, work longer: OECD, 3-150. Retrieved from https://read.oecd-ilibrary.org/employment/live-longer-work- longer_9789264035881-en#page1
Kehoe, L., Walton, J., & Flynn, A. (2019). Nutritional challenges for older adults in Europe: current status and future directions. Proceedings of the Nutrition Society, 78(2), 221-233.
https://doi.org/10.1017/S0029665118002744
Klevan, T., Jonassen, R., Sælør, K. T., & Borg, M. (2020). Using dyadic interviews to explore recovery as collaborative practices: challenging the epistemic norm of the single person perspective. International Journal of Qualitative Methods, 19,1-9.
https://doi.org/10.1177/1609406920967868
Kozáková, R., & Zeleníková, R. (2014). Assessing the nutritional status of the elderly living at home. European Geriatric Medicine, 5(6), 377-381.
https://doi.org/10.1016/j.eurger.2014.07.003
Kremers, S. P., De Bruijn, G.-J., Schaalma, H., & Brug, J. (2004). Clustering of energy balance-related behaviours and their intrapersonal determinants. Psychology & Health, 19(5), 595-606.
https://doi.org/10.1080/08870440412331279630
Krippendorff, K. (2018). Content analysis: An Introduction to its Methodology. Thousand Oaks, CA: SAGE Publications.
https://doi.org/10.4135/9781071878781
Köster, E. P. (2009). Diversity in the determinants of food choice: a psychological perspective. Food Quality and Preference, 20(2), 70- 82.
https://doi.org/10.1016/j.foodqual.2007.11.002
Lampuré, A., Schlich, P., Deglaire, A., Castetbon, K., Péneau, S., Hercberg, S., & Méjean, C. (2015). Sociodemographic, psychological, and lifestyle characteristics are associated with a liking for salty and sweet tastes in French adults. The Journal of Nutrition, 145(3), 587-594.
https://doi.org/10.3945/jn.114.201269
Larsen, K. R., Michie, S., Hekler, E. B., Gibson, B., Spruijt-Metz, D., Ahern, D., Cole-Lewis, H., Bartlett Ellis, R., Hesse, B., Moser, R. P., & Yi, J. (2017). Behavior change interventions: the potential of ontologies for advancing science and practice. Journal of Behavioral Medicine, 40(1), 6-22.
https://doi.org/10.1007/s10865-016-9768-0
Larson, & Story. (2009). A review of environmental influences on food choices. Annals of Behavioral Medicine, 38(1), 56-73.
https://doi.org/10.1007/s12160-009-9120-9
Lesakova, D. (2016). Seniors and their food shopping behavior: an empirical analysis. Procedia Social and Behavioral Sciences, 220, 243-250.
https://doi.org/10.1016/j.sbspro.2016.05.496
Lesáková, D. (2018). Health perception and food choice factors in predicting healthy consumption among elderly. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 66, 1527-1534.
https://doi.org/10.11118/actaun201866061527
Lewin, K. (1951). Field Theory of Social Science: Selected Theoretical Papers (Edited by Dorwin Cartwright.). New York: Harper & Brothers.
Lincoln, Y. S., & Guba, E. G. (1986). But is it rigorous? Trustworthiness and authenticity in naturalistic evaluation. New Directions for Program Evaluation, 1986(30), 73-84.
https://doi.org/10.1002/ev.1427
Locher, J. L., Burgio, K. L., Yoels, W. C., & Ritchie, C. S. (1998). The social significance of food and eating in the lives of older recipients of meals on wheels. Journal of Nutrition for the Elderly, 17(2), 15-33.
https://doi.org/10.1300/J052v17n02_02
Long, T., & Johnson, M. (2000). Rigour, reliability and validity in qualitative research. Clinical Effectiveness in Nursing, 4(1), 30-37.
https://doi.org/10.1054/cein.2000.0106
Lumbers, M., & Raats, M. (2006). Food choices in later life. Frontiers in Nutritional Science, 3, 289- 310.
https://doi.org/10.1079/9780851990323.0289
MacLeod, S., Musich, S., Hawkins, K., Alsgaard, K., & Wicker, E. R. (2016). The impact of resilience among older adults. Geriatric Nursing, 37(4), 266-272.
https://doi.org/10.1016/j.gerinurse.2016.02.014
Malmqvist, J., Hellberg, K., Möllås, G., Rose, R., & Shevlin, M. (2019). Conducting the pilot study: a neglected part of the research process? Methodological findings supporting the importance of piloting in qualitative research studies. International Journal of Qualitative Methods,18, 1-11.
https://doi.org/10.1177/1609406919878341
Marek, K. D., Stetzer, F., Adams, S. J., Popejoy, L. L., & Rantz, M. (2012). Aging in place versus nursing home care: comparison of costs to Medicare and Medicaid. Research in Gerontological Nursing, 5(2), 123-129.
https://doi.org/10.3928/19404921-20110802-01
Marquet, O., Maciejewska, M., Delclòs-Alió, X., Vich, G., Schipperijn, J., & Miralles-Guasch, C. (2020). Physical activity benefits of attending a senior center depend largely on age and gender: a study using GPS and accelerometry data. BMC Geriatrics, 20, 1-10.
https://doi.org/10.1186/s12877-020-01527-6
Meneely, L., Strugnell, C., & Burns, A. (2009). Elderly consumers and their food store experiences. Journal of Retailing and Consumer Services, 16(6), 458-465.
https://doi.org/10.1016/j.jretconser.2009.06.006
Methven, L., Jiménez-Pranteda, M. L., & Lawlor, J. B. (2016). Sensory and consumer science methods used with older adults: a review of current methods and recommendations for the future. Food Quality and Preference, 48, 333-344.
https://doi.org/10.1016/j.foodqual.2015.07.001
Meule, A., & Vögele, C. (2013). The psychology of eating. In (Vol. 4, pp. 215): Frontiers in Psychology.
https://doi.org/10.3389/fpsyg.2013.00215
Morgan, D. L. (2016). Essentials of Dyadic Interviewing (1ed). New York: Routledge.
https://doi.org/10.4324/9781315429373
Morgan, D. L., Ataie, J., Carder, P., & Hoffman, K. (2013). Introducing dyadic interviews as a method for collecting qualitative data. Qualitative Health Research, 23(9), 1276-1284.
https://doi.org/10.1177/1049732313501889
Morganosky, M. A., & Cude, B. J. (2000). Consumer response to online grocery shopping. International Journal of Retail & Distribution Management, (28), pp.17-26.
https://doi.org/10.1108/09590550010306737
Morse, J. M., Barrett, M., Mayan, M., Olson, K., & Spiers, J. (2002). Verification strategies for establishing reliability and validity in qualitative research. International Journal of Qualitative Methods, 1(2), 13-22.
https://doi.org/10.1177/160940690200100202
Munoz-Plaza, C. E., Morland, K. B., Pierre, J. A., Spark, A., Filomena, S. E., & Noyes, P. (2013). Navigating the urban food environment: challenges and resilience of community-dwelling older adults. Journal of Nutrition Education and Behavior, 45(4), 322-331.
https://doi.org/10.1016/j.jneb.2013.01.015
Nagler, R. H. (2014). Adverse outcomes associated with media exposure to contradictory nutrition messages. Journal of Health Communication, 19(1), 24-40.
https://doi.org/10.1080/10810730.2013.798384
Negron-Poblete, P., Séguin, A.-M., & Apparicio, P. (2016). Improving walkability for seniors through accessibility to food stores: a study of three areas of Greater Montreal. Journal of Urbanism: International Research on Placemaking and Urban Sustainability, 9(1), 51-72.
https://doi.org/10.1080/17549175.2014.990916
Neugarten, B. L., & Hagestad, G. (1976). Age and the life course. Handbook of Aging and the Social Sciences, 35-55.
Nigam, Y., Knight, J., Bhattacharya, S., & Bayer, A. (2012). Physiological changes associated with aging and immobility. Journal of Aging Research, 1-2.
https://doi.org/10.1155/2012/468469
Noble, H., & Smith, J. (2015). Issues of validity and reliability in qualitative research. Evidence-Based Nursing, 18(2), 34-35.
https://doi.org/10.1136/eb-2015-102054
Nordin, S., Brämerson, A., Bringlöv, E., Kobal, G., Hummel, T., & Bende, M. (2007). Substance and tongue-region specific loss in basic taste- quality identification in elderly adults. European Archives of Oto- Rhino-Laryngology, 264(3), 285-289.
https://doi.org/10.1007/s00405-006-0169-9
Nyberg, M., Olsson, V., Örtman, G., Pajalic, Z., Andersson, H. S., Blücher, A., Lindborg, A.-L., Wendin, K., & Westergren, A. (2018). The meal as a performance: food and meal practices beyond health and nutrition. Ageing & Society, 38(1), 83-107.
https://doi.org/10.1017/S0144686X16000945
Ogilvie, D., Adams, J., Bauman, A., Gregg, E. W., Panter, J., Siegel, K. R., Wareham, N. J., & White, M. (2020). Using natural experimental studies to guide public health action: turning the evidence-based medicine paradigm on its head. Journal of Epidemiology Community Health, 74(2), 203-208.
https://doi.org/10.1136/jech-2019-213085
Payne, L., Harris, P., Ghio, D., Slodkowska‐Barabasz, J., Sutcliffe, M., Kelly, J., Stroud, M., Little, P., Yardley, L.,Morrison, L. (2020). Beliefs about inevitable decline among home‐living older adults at risk of malnutrition: a qualitative study. Journal of Human Nutrition and Dietetics, 33(6), 841-851.
https://doi.org/10.1111/jhn.12807
Pilgrim, A., Robinson, S., Sayer, A. A., & Roberts, H. (2015). An overview of appetite decline in older people. Nursing Older People, 27(5), 29-35.
https://doi.org/10.7748/nop.27.5.29.e697
Podsakoff, P. M., MacKenzie, S. B., Lee, J.-Y., & Podsakoff, N. P. (2003). Common method biases in behavioral research: a critical review of the literature and recommended remedies. Journal of Applied Psychology, 88(5), 879-903.
https://doi.org/10.1037/0021-9010.88.5.879
Podsakoff, P. M., MacKenzie, S. B., & Podsakoff, N. P. (2012). Sources of method bias in social science research and recommendations on how to control it. Annual Review of Psychology, 63(1), 539-569.
https://doi.org/10.1146/annurev-psych-120710-100452
Portacolone, E. (2011). The myth of independence for older Americans living alone in the Bay Area of San Francisco: a critical reflection. Ageing & Society, 31(5), 803-828.
https://doi.org/10.1017/S0144686X10001169
Poscia, A., Milovanovic, S., La Milia, D. I., Duplaga, M., Grysztar, M., Landi, F., Moscato, U., Magnavita, N., Callamati, A., Ricciardi, W. (2018). Effectiveness of nutritional interventions addressed to elderly persons: umbrella systematic review with meta-analysis. The European Journal of Public Health, 28(2), 275-283.
https://doi.org/10.1093/eurpub/ckx199
Posner, B. M., Jette, A., Smigelski, C., Miller, D., & Mitchell, P. (1994). Nutritional risk in New England elders. Journal of Gerontology, 49(3), M123-M132.
https://doi.org/10.1093/geronj/49.3.M123
Radermacher, H., Feldman, S., & Bird, S. (2010). Food security in older Australians from different cultural backgrounds. Journal of Nutrition Education and Behavior, 42(5), 328-336.
https://doi.org/10.1016/j.jneb.2009.10.004
Regjeringen. (25.03.2022). Ny reform skal gjøre det trygt for eldre å bo lenger hjemme. Retrieved from https://www.regjeringen.no/no/aktuelt/ny-reform-for- eldre/id2905812/
Rosenberg, M., & Everitt, J. (2001). Planning for aging populations: inside or outside the walls. Progress in Planning, 56(3), 119-168.
https://doi.org/10.1016/S0305-9006(01)00014-9
Sandelowski, M. (1993). Rigor or rigor mortis: the problem of rigor in qualitative research. Advances in Nursing Science, 16(2), 1-8.
https://doi.org/10.1097/00012272-199312000-00002
Sawyer, A. D., Van Lenthe, F., Kamphuis, C. B., Terragni, L., Roos, G., Poelman, M. P., Nicolaou, M., Waterlander, W., Djojosoeparto, S.K., Scheidmeir, M., Neuman-Podczaska, A., & Stronks, K. (2021). Dynamics of the complex food environment underlying dietary intake in low-income groups: a systems map of associations extracted from a systematic umbrella literature review. International Journal of Behavioral Nutrition and Physical Activity, 18(1), 1-21.
https://doi.org/10.1186/s12966-021-01164-1
Schroots, J., & Birren, J. E. (1988). The nature of time: implications for research on aging. Comprehensive Gerontology. Section C, Interdisciplinary topics, 2(1), 1-29.
Schwarz, G., & Stensaker, I. (2014). Time to take off the theoretical straightjacket and (re-) introduce phenomenon-driven research. The Journal of Applied Behavioral Science, 50(4), 478-501.
https://doi.org/10.1177/0021886314549919
Sergi, G., Bano, G., Pizzato, S., Veronese, N., & Manzato, E. (2017). Taste loss in the elderly: possible implications for dietary habits. Critical Reviews in Food Science and Nutrition, 57(17), 3684-3689.
https://doi.org/10.1080/10408398.2016.1160208
Settersten Jr, R. A., & Mayer, K. U. (1997). The measurement of age, age structuring, and the life course. Annual Review of Sociology, 23(1), 233-261.
https://doi.org/10.1146/annurev.soc.23.1.233
Shatenstein, B. (2008). Impact of health conditions on food intakes among older adults. Journal of Nutrition for the Elderly, 27(3-4), 333-361.
https://doi.org/10.1080/01639360802265889
Shepherd, R. (2005). Influences on food choice and dietary behavior. Diet Diversification and Health Promotion, 57, 36-43.
https://doi.org/10.1159/000083752
Short, F. (2003). Domestic cooking skills: what are they? Journal of the Home Economics Institute of Australia, 10(3), 13-22.
Sidenvall, B., Nydahl, M., & Fjellström, C. (2001). Managing food shopping and cooking: the experiences of older Swedish women. Ageing & Society, 21(2), 151-168.
https://doi.org/10.1017/S0144686X01008121
Sixsmith, A., & Sixsmith, J. (2008). Ageing in place in the United Kingdom. Ageing International, 32(3), 219-235.
https://doi.org/10.1007/s12126-008-9019-y
Smith, T. B., Holt-Lunstad, J., & Layton, J. B. (2010). Social relationships and mortality risk: a meta-analytic review. PLOS Medicine, (7)1-20.
https://doi.org/10.4016/19865.01
Sobal, J., & Bisogni, C. A. (2009). Constructing food choice decisions. Annals of Behavioral Medicine, 38, 37-46.
https://doi.org/10.1007/s12160-009-9124-5
Sobal, J., Bisogni, C. A., Devine, C. M., & Jastran, M. (2006). A Conceptual Model of the Food Choice Process over the Life Course. CABI, (vol 3), 1-18.
https://doi.org/10.1079/9780851990323.0001
Statistics Norway. (03.06.2020). A historic shift: soon more older people than children and young people. Retrieved from https://www.ssb.no/befolkning/artikler-og-publikasjoner/et-historisk- skifte-flere-eldre-enn
Steenkamp, J.-B., & Van Trijp, H. (1997). Attribute elicitation in marketing research: a comparison of three procedures. Marketing Letters, 8(2), 153-165.
https://doi.org/10.1023/A:1007975518638
Stoecker, R., & Avila, E. (2021). From mixed methods to strategic research design. International Journal of Social Research Methodology, 24(6), 627-640.
https://doi.org/10.1080/13645579.2020.1799639
Stok, M. F., Renner, B., Allan, J., Boeing, H., Ensenauer, R., Issanchou, S., Kiesswetter, E., Lien, N., Mazzocchi, M., Monsivais, P., Stelmach- Mardas, M., Volkert, D., & Hoffmann, S. (2018). Dietary behavior: an interdisciplinary conceptual analysis and taxonomy. Frontiers in Psychology, 9(689), 1-13.
https://doi.org/10.3389/fpsyg.2018.01689
Stroebele, N., & De Castro, J. M. (2004). Effect of ambience on food intake and food choice. Nutrition, 20(9), 821-838.
https://doi.org/10.1016/j.nut.2004.05.012
Sullivan, D. H., Sun, S., & Walls, R. C. (1999). Protein-energy undernutrition among elderly hospitalized patients: a prospective study. JAMA, 281(21), 2013-2019.
https://doi.org/10.1001/jama.281.21.2013
Sun, Y.-H. C. (2008). Health concern, food choice motives, and attitudes toward healthy eating: the mediating role of food choice motives. Appetite, 51(1), 42-49.
https://doi.org/10.1016/j.appet.2007.11.004
Symmank, C., Mai, R., Hoffmann, S., Stok, F. M., Renner, B., Lien, N., & Rohm, H. (2017). Predictors of food decision making: a systematic interdisciplinary mapping (SIM) review. Appetite, 110, 25-35.
https://doi.org/10.1016/j.appet.2016.11.023
Söderhamn, U., Dale, B., Sundsli, K., & Söderhamn, O. (2012). Nutritional screening of older home-dwelling Norwegians: a comparison between two instruments. Clinical Interventions in Aging, 7, 383-391.
https://doi.org/10.2147/CIA.S35986
Takahashi, K., Murayama, H., Tanaka, T., Takase, M., Suthutvoravut, U., & Iijima, K. (2020). A qualitative study on the reasons for solitary eating habits of older adults living with family. PLOS ONE, 15(6), 1- 10.
https://doi.org/10.1371/journal.pone.0234379
Tani, Y., Fujiwara, T., & Kondo, K. (2020). Cooking skills related to potential benefits for dietary behaviors and weight status among older Japanese men and women: a cross-sectional study from the JAGES. International Journal of Behavioral Nutrition and Physical Activity, 17(1), 1-12.
https://doi.org/10.1186/s12966-020-00986-9
Vesnaver, E., Keller, H. H., Payette, H., & Shatenstein, B. (2012). Dietary resilience as described by older community-dwelling adults from the NuAge study "If there is a will-there is a way!". Appetite, 58(2), 730- 738.
https://doi.org/10.1016/j.appet.2011.12.008
Vesnaver, E., Keller, H. H., Sutherland, O., Maitland, S. B., & Locher, J. L. (2016). Alone at the table: food behavior and the loss of commensality in widowhood. Journals of Gerontology, 71(6), 1059- 1069.
https://doi.org/10.1093/geronb/gbv103
Vieira Jr, H., Sanchez, S. M., Kienitz, K. H., & Belderrain, M. C. N. (2013). Efficient, nearly orthogonal-and-balanced, mixed designs: an effective way to conduct trade-off analyses via simulation. Journal of Simulation, 7(4), 264-275.
https://doi.org/10.1057/jos.2013.14
Wang, & Cheng. (2020). Cross-sectional studies: strengths, weaknesses, and recommendations. CHEST, 158(1), S65-S71.
https://doi.org/10.1016/j.chest.2020.03.012
Wang, & Li. (2002). Handling large numbers of attributes and/or levels in conjoint experiments. Geographical Analysis, 34(4), 350-362.
https://doi.org/10.1111/j.1538-4632.2002.tb01094.x
Wansink, B., & Sobal, J. (2007). Mindless eating: the 200 daily food decisions we overlook. Environment and Behavior, 39(1), 106-123.
https://doi.org/10.1177/0013916506295573
Webber, S. C., Porter, M. M., & Menec, V. H. (2010). Mobility in older adults: a comprehensive framework. The Gerontologist, 50(4), 443- 450.
https://doi.org/10.1093/geront/gnq013
Weil, J. (2015). Applying research methods to a gerontological population: matching data collection to characteristics of older persons. Educational Gerontology, 41(10), 723-742.
https://doi.org/10.1080/03601277.2015.1048172
White, P. (2013). Who's afraid of research questions? The neglect of research questions in the methods literature and a call for question-led methods teaching. International Journal of Research & Method in Education, 36(3), 213-227.
https://doi.org/10.1080/1743727X.2013.809413
WHO. (2003). Diet, nutrition, and the prevention of chronic diseases: report of a joint WHO/FAO expert consultation (Vol. 916): World Health Organization. Retrieved from http://whqlibdoc.who.int/trs/WHO_TRS_916.pdf
Wiles, J. L., Leibing, A., Guberman, N., Reeve, J., & Allen, R. E. (2012). The meaning of "aging in place" to older people. The Gerontologist, 52(3), 357-366.
https://doi.org/10.1093/geront/gnr098
Willems, P., Brown, M., Van Ossenbruggen, R., & Vonk, T. (2006). The effects of panel recruitment and management on research results. Paper presented at the ESOMAR Panel Research Conference, Barcelona, Spain. Retrieved from https://tinyurl.com/y9uye4vx
Wilson, L. C., Alexander, A., & Lumbers, M. (2004). Food access and dietary variety among older people. International Journal of Retail & Distribution Management, (32), pp.109-122.
https://doi.org/10.1108/09590550410521789
Winter, J., McNaughton, S., & Nowson, C. (2016). Older adults' attitudes to food and nutrition: a qualitative study. The Journal of Aging Research and Clinical Practice, 5(2), 114-119.
Wolfe, W. S., Frongillo, E. A., & Valois, P. (2003). Understanding the experience of food insecurity by elders suggests ways to improve its measurement. The Journal of Nutrition, 133(9), 2762-2769.
https://doi.org/10.1093/jn/133.9.2762
Wolfson, J. A., Ramsing, R., Richardson, C. R., & Palmer, A. (2019). Barriers to healthy food access: associations with household income and cooking behavior. Preventive Medicine Reports, 13, 298-305.
https://doi.org/10.1016/j.pmedr.2019.01.023
Wylie, C., Copeman, J., & Kirk, S. (1999). Health and social factors affecting the food choice and nutritional intake of elderly people with restricted mobility. Journal of Human Nutrition and Dietetics, 12(5), 375-380.
