{"id":{"repo_id":"cambridge","oai_identifier":"oai:www.repository.cam.ac.uk:1810/392443"},"canonical_url":"https://search.dev.ndltd.org/etd/cambridge/oai:www.repository.cam.ac.uk:1810/392443","repository":{"repo_id":"cambridge","name":"Cambridge University","base_url":"https://api.repository.cam.ac.uk/server/oai/request"},"display":{"title":"Interpersonal Determinants of Diet in Young People","abstract":"Adolescence and early adulthood are critical periods for developing dietary patterns that impact long-term health outcomes. With rising rates of overweight and obesity in this age group, there is a need to better understand their diet and what may be associated with changes in diet quality. During the transition from adolescence to early adulthood there is a shift in social and environmental influences, alongside increased independence. However, there is currently a lack of understanding in what drives diet quality during this transitional period and how shifting interpersonal factors may be contributing. Although parents are known to have considerable influence on childhood diet, how this influence changes as adolescents mature is unknown. The aim of this thesis is to investigate the interpersonal determinants of diet in young people and how they are associated with changes in diet quality during the transition from adolescence to early adulthood, with a particular focus on parental influence and living arrangements. A systematic scoping review identified significant gaps in the published literature regarding interpersonal determinants of diet quality and eating behaviours in individuals aged 13 to 30 years. Notably, I found a lack of longitudinal evidence across the transitional period between adolescence and early adulthood. To address this, I used longitudinal data from the United Kingdom and Australia to explore dietary trajectories and their determinants across the transitional period. The first study examined fruit and vegetable intake trajectories among young adults aged 16 to 30 years in the United Kingdom Household Longitudinal Study (UKHLS) and the Household, Income and Labour Dynamics in Australia (HILDA) Survey. Results showed a decline in fruit intake but an increase in vegetable intake with age, with differences by sex and parental education, highlighting persistent inequalities. The second study investigated the influence of parental diet and the impact of leaving the parental home on individual diet. Findings from analysis of the UKHLS data showed that parental fruit and vegetable intake remained positively associated with adolescent and young adult fruit and vegetable intake up to age 30, though the strength of the association varied by age and living arrangement. The association was lowest during early adolescence (10 to 14 years), when adolescents may be more influenced by their peers, and peaked at 17 to 18 years. Although leaving the parental home reduced the association between parental and adolescent and young adult fruit and vegetable consumption, the positive association remained positive up to age 30 years. My final study builds on the concept that a transition in living arrangement may be associated with changes diet quality. Utilising the Raine Study, I conducted a trajectory analysis to investigate how the initial transition out of the parental home to different living arrangements influences diet quality in young adults aged 14 to 27 years. The study found a quadratic trajectory for Dietary Approaches to Stop Hypertension (DASH) score and proportion of energy from discretionary foods and beverages. Compared to those who continued to live in the parental home, there was a drop in diet quality across both measures for those that left. Specifically, moving in with a partner saw a significant decrease in DASH score. Collectively, the findings from this thesis highlight the importance of interpersonal determinants of diet quality during the transition from adolescence into early adulthood. Understanding these dynamics could help inform targeted multi-sectoral interventions and policy strategies to support healthier dietary behaviours during this pivotal life stage, and as a result, improve long-term health outcomes.","abstract_html":"Adolescence and early adulthood are critical periods for developing dietary patterns that impact long-term health outcomes. With rising rates of overweight and obesity in this age group, there is a need to better understand their diet and what may be associated with changes in diet quality. During the transition from adolescence to early adulthood there is a shift in social and environmental influences, alongside increased independence. However, there is currently a lack of understanding in what drives diet quality during this transitional period and how shifting interpersonal factors may be contributing. Although parents are known to have considerable influence on childhood diet, how this influence changes as adolescents mature is unknown. The aim of this thesis is to investigate the interpersonal determinants of diet in young people and how they are associated with changes in diet quality during the transition from adolescence to early adulthood, with a particular focus on parental influence and living arrangements. A systematic scoping review identified significant gaps in the published literature regarding interpersonal determinants of diet quality and eating behaviours in individuals aged 13 to 30 years. Notably, I found a lack of longitudinal evidence across the transitional period between adolescence and early adulthood. To address this, I used longitudinal data from the United Kingdom and Australia to explore dietary trajectories and their determinants across the transitional period. The first study examined fruit and vegetable intake trajectories among young adults aged 16 to 30 years in the United Kingdom Household Longitudinal Study (UKHLS) and the Household, Income and Labour Dynamics in Australia (HILDA) Survey. Results showed a decline in fruit intake but an increase in vegetable intake with age, with differences by sex and parental education, highlighting persistent inequalities. The second study investigated the influence of parental diet and the impact of leaving the parental home on individual diet. Findings from analysis of the UKHLS data showed that parental fruit and vegetable intake remained positively associated with adolescent and young adult fruit and vegetable intake up to age 30, though the strength of the association varied by age and living arrangement. The association was lowest during early adolescence (10 to 14 years), when adolescents may be more influenced by their peers, and peaked at 17 to 18 years. Although leaving the parental home reduced the association between parental and adolescent and young adult fruit and vegetable consumption, the positive association remained positive up to age 30 years. My final study builds on the concept that a transition in living arrangement may be associated with changes diet quality. Utilising the Raine Study, I conducted a trajectory analysis to investigate how the initial transition out of the parental home to different living arrangements influences diet quality in young adults aged 14 to 27 years. The study found a quadratic trajectory for Dietary Approaches to Stop Hypertension (DASH) score and proportion of energy from discretionary foods and beverages. Compared to those who continued to live in the parental home, there was a drop in diet quality across both measures for those that left. Specifically, moving in with a partner saw a significant decrease in DASH score. Collectively, the findings from this thesis highlight the importance of interpersonal determinants of diet quality during the transition from adolescence into early adulthood. Understanding these dynamics could help inform targeted multi-sectoral interventions and policy strategies to support healthier dietary behaviours during this pivotal life stage, and as a result, improve long-term health outcomes.","abstract_has_math":false,"creators":["Braune, Tanya"],"institution":"University of Cambridge","degree_name":"Doctor of Philosophy (PhD)","degree_level":"Doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Adams, Jean","Winpenny, Eleanor"],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-07-31","date_published":"2025-07-31","updated_at":"2026-07-22T22:24:01Z","subjects":["Young people","Diet","Behavioural epidemiology","Interpersonal determinants"],"languages":["eng"],"rights":[],"rights_urls":["https://www.repository.cam.ac.uk/bitstreams/b68ef975-ec73-4e34-8070-f5abd6ae14b3/download","http://purl.org/NET/rdflicense/allrightsreserved"],"identifier_entries":[{"key":"dc:creator.authoridentifier","label":"Author Identifier","values":["0009000594506567"],"render_values":[{"text":"0009-0005-9450-6567","href":"https://orcid.org/0009-0005-9450-6567","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.17863/CAM.123137","outbound_label":"DOI","outbound_source":"dc:identifier.doi"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Adams, Jean","Winpenny, Eleanor"]},{"key":"dc:contributor.sponsor","label":"Sponsor","values":["Cambridge MRC Doctoral Training Partnership (grant number MR/N013433/1) The Elizabeth McDowell Studentship at Newnham College, Cambridge."]},{"key":"dc:creator","label":"Author","values":["Braune, Tanya"]},{"key":"dc:creator.authoridentifier","label":"Author Identifier","values":["0009000594506567"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2025-07-31"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cambridge"]},{"key":"dc:relation.isreferencedby.uri","label":"Dc Relation Isreferencedby URI","values":["https://www.repository.cam.ac.uk/handle/1810/392443"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctor of Philosophy (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Young people","Diet","Behavioural epidemiology","Interpersonal determinants"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["https://www.repository.cam.ac.uk/bitstreams/b68ef975-ec73-4e34-8070-f5abd6ae14b3/download","http://purl.org/NET/rdflicense/allrightsreserved"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.17863/CAM.123137"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://www.repository.cam.ac.uk/bitstreams/962f31a9-5ba4-4fe6-ac87-c0afd37f8104/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Adolescence and early adulthood are critical periods for developing dietary patterns that impact long-term health outcomes. 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A systematic scoping review identified significant gaps in the published literature regarding interpersonal determinants of diet quality and eating behaviours in individuals aged 13 to 30 years. Notably, I found a lack of longitudinal evidence across the transitional period between adolescence and early adulthood. To address this, I used longitudinal data from the United Kingdom and Australia to explore dietary trajectories and their determinants across the transitional period. The first study examined fruit and vegetable intake trajectories among young adults aged 16 to 30 years in the United Kingdom Household Longitudinal Study (UKHLS) and the Household, Income and Labour Dynamics in Australia (HILDA) Survey. Results showed a decline in fruit intake but an increase in vegetable intake with age, with differences by sex and parental education, highlighting persistent inequalities. The second study investigated the influence of parental diet and the impact of leaving the parental home on individual diet. Findings from analysis of the UKHLS data showed that parental fruit and vegetable intake remained positively associated with adolescent and young adult fruit and vegetable intake up to age 30, though the strength of the association varied by age and living arrangement. The association was lowest during early adolescence (10 to 14 years), when adolescents may be more influenced by their peers, and peaked at 17 to 18 years. Although leaving the parental home reduced the association between parental and adolescent and young adult fruit and vegetable consumption, the positive association remained positive up to age 30 years. My final study builds on the concept that a transition in living arrangement may be associated with changes diet quality. Utilising the Raine Study, I conducted a trajectory analysis to investigate how the initial transition out of the parental home to different living arrangements influences diet quality in young adults aged 14 to 27 years. The study found a quadratic trajectory for Dietary Approaches to Stop Hypertension (DASH) score and proportion of energy from discretionary foods and beverages. Compared to those who continued to live in the parental home, there was a drop in diet quality across both measures for those that left. Specifically, moving in with a partner saw a significant decrease in DASH score. Collectively, the findings from this thesis highlight the importance of interpersonal determinants of diet quality during the transition from adolescence into early adulthood. 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With rising rates of overweight and obesity in this age group, there is a need to better understand their diet and what may be associated with changes in diet quality. During the transition from adolescence to early adulthood there is a shift in social and environmental influences, alongside increased independence. However, there is currently a lack of understanding in what drives diet quality during this transitional period and how shifting interpersonal factors may be contributing. Although parents are known to have considerable influence on childhood diet, how this influence changes as adolescents mature is unknown. The aim of this thesis is to investigate the interpersonal determinants of diet in young people and how they are associated with changes in diet quality during the transition from adolescence to early adulthood, with a particular focus on parental influence and living arrangements. A systematic scoping review identified significant gaps in the published literature regarding interpersonal determinants of diet quality and eating behaviours in individuals aged 13 to 30 years. Notably, I found a lack of longitudinal evidence across the transitional period between adolescence and early adulthood. To address this, I used longitudinal data from the United Kingdom and Australia to explore dietary trajectories and their determinants across the transitional period. The first study examined fruit and vegetable intake trajectories among young adults aged 16 to 30 years in the United Kingdom Household Longitudinal Study (UKHLS) and the Household, Income and Labour Dynamics in Australia (HILDA) Survey. Results showed a decline in fruit intake but an increase in vegetable intake with age, with differences by sex and parental education, highlighting persistent inequalities. The second study investigated the influence of parental diet and the impact of leaving the parental home on individual diet. Findings from analysis of the UKHLS data showed that parental fruit and vegetable intake remained positively associated with adolescent and young adult fruit and vegetable intake up to age 30, though the strength of the association varied by age and living arrangement. The association was lowest during early adolescence (10 to 14 years), when adolescents may be more influenced by their peers, and peaked at 17 to 18 years. Although leaving the parental home reduced the association between parental and adolescent and young adult fruit and vegetable consumption, the positive association remained positive up to age 30 years. My final study builds on the concept that a transition in living arrangement may be associated with changes diet quality. Utilising the Raine Study, I conducted a trajectory analysis to investigate how the initial transition out of the parental home to different living arrangements influences diet quality in young adults aged 14 to 27 years. The study found a quadratic trajectory for Dietary Approaches to Stop Hypertension (DASH) score and proportion of energy from discretionary foods and beverages. Compared to those who continued to live in the parental home, there was a drop in diet quality across both measures for those that left. Specifically, moving in with a partner saw a significant decrease in DASH score. Collectively, the findings from this thesis highlight the importance of interpersonal determinants of diet quality during the transition from adolescence into early adulthood. Understanding these dynamics could help inform targeted multi-sectoral interventions and policy strategies to support healthier dietary behaviours during this pivotal life stage, and as a result, improve long-term health outcomes."],"dc:format.checksum.md5":["96e67ffbc5ab124fd16998af5a5f7201","87eda9de84448d1f82354d60eee3eb5f"],"dc:identifier.doi":["https://doi.org/10.17863/CAM.123137"],"dc:identifier.uri":["https://www.repository.cam.ac.uk/bitstreams/962f31a9-5ba4-4fe6-ac87-c0afd37f8104/download"],"dc:language":["eng"],"dc:publisher.institution":["University of Cambridge"],"dc:relation.isreferencedby.uri":["https://www.repository.cam.ac.uk/handle/1810/392443"],"dc:rights":["https://www.repository.cam.ac.uk/bitstreams/b68ef975-ec73-4e34-8070-f5abd6ae14b3/download","http://purl.org/NET/rdflicense/allrightsreserved"],"dc:subject":["Young people","Diet","Behavioural epidemiology","Interpersonal determinants"],"dc:title":["Interpersonal Determinants of Diet in Young People"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["Doctoral"],"dc:type.qualificationname":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-22T22:24:01Z"}