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- Member of: ASU Electronic Theses and Dissertations
Description
Fruit and vegetable (FV) consumption continues to lag far behind US Department of Agriculture (USDA) recommendations. Interventions targeting individuals' dietary behaviors address only a small fraction of dietary influences. Changing the food environment by increasing availability of and excitement for FV through local food production has shown promise as a method for enhancing intake. However, the extent to which local production is sufficient to meet recommended FV intakes, or actual intakes, of specific populations remains largely unconsidered. This study was the first of its kind to evaluate the capacity to support FV intake of Arizona's population with statewide production of FV. We created a model to evaluate what percentage of Dietary Guidelines for Americans (DGA) recommendations, as well as actual consumption, state-level FV production could meet in a given year. Intake and production figures were amended to include estimates of only fresh, non-tropical FV. Production was then estimated by month and season to illustrate fluctuations in availability of FV. Based on our algorithm, Arizona production met 184.5% of aggregate fresh vegetable recommendations, as well as 351.9% of estimated intakes of Arizonans, but met only 29.7% of recommended and 47.8% of estimated intake of fresh, non-tropical fruit. Much of the excess vegetable production can be attributed to the dark-green vegetable sub-group category, which could meet 3204.6% and 3160% of Arizonans' aggregated recommendations and estimated intakes, respectively. Only minimal seasonal variations in the total fruit and total vegetable categories were found, but production of the five vegetable sub-groups varied between the warm and cool seasons by 19-98%. For example, in the starchy vegetable group, cool season (October to March) production met only 3.6% of recommendations, but warm season (April to November) production supplied 196.5% of recommendations. Results indicate that Arizona agricultural production has the capacity to meet a large proportion of the population's FV needs throughout much of the year, while at the same time remaining a major producer of dark-green vegetables for out-of-state markets.
ContributorsVaudrin, Nicole (Author) / Wharton, Christopher (Christopher Mack), 1977- (Thesis advisor) / Bruening, Meg (Thesis advisor) / Ohri-Vachaspati, Punam (Committee member) / Villalobos, J. Rene (Committee member) / Arizona State University (Publisher)
Created2013
Description
Objectives Through a cross-sectional observational study, this thesis evaluates the relationship between food insecurity and weight status, eating behaviors, the home food environment, meal planning and preparation, and perceived stress as it relates to predominantly Hispanic/Latino parents in Phoenix, Arizona. The purpose of this study was to address gaps in the literature by examining differences in "healthy" and "unhealthy" eating behaviors, foods available in the home, how time and low energy impact meal preparation, and the level of stress between food security groups. Methods Parents, 18 years or older, were recruited during two pre-scheduled health fairs, from English as a second language classes, or from the Women, Infants, and Children's clinic at a local community center, Golden Gate Community Center, in Phoenix, Arizona. An interview, electronic, or paper survey were offered in either Spanish or English to collect data on the variables described above. In addition to the survey, height and weight were collected for all participants to determine BMI and weight status. One hundred and sixty participants were recruited. Multivariate linear and logistic regression models, adjusting for weight status, education, race/ethnicity, income level, and years residing in the U.S., were used to assess the relationship between food security status and weight status, eating behaviors, the home food environment, meal planning and preparation, and perceived stress. Results Results concluded that food insecurity was more prevalent among parents reporting lower income levels compared to higher income levels (p=0.017). In adjusted models, higher perceived cost of fruits (p=0.004) and higher perceived level of stress (p=0.001) were associated with food insecurity. Given that the sample population was predominately women, a post-hoc analysis was completed on women only. In addition to the two significant results noted in the adjusted analyses, the women-only analysis revealed that food insecure mothers reported lower amounts of vegetables served with meals (p=0.019) and higher use of fast-food when tired or running late (p=0.043), compared to food secure mothers. Conclusion Additional studies are needed to further assess differences in stress levels between food insecure parents and food insecure parents, with special consideration for directionality and its relationship to weight status.
ContributorsVillanova, Christina (Author) / Bruening, Meg (Thesis advisor) / Ohri-Vachaspati, Punam (Committee member) / Vega-Lopez, Sonia (Committee member) / Arizona State University (Publisher)
Created2014
Description
Food system and health characteristics were evaluated across the last Waorani hunter-gatherer group in Amazonian Ecuador and a remote neighboring Kichwa indigenous subsistence agriculture community. Hunter-gatherer food systems like the Waorani foragers may not only be nutritionally, but also pharmaceutically beneficial because of high dietary intake of varied plant phytochemical compounds. A modern diet that reduces these dietary plant defense phytochemicals below levels typical in human evolutionary history may leave humans vulnerable to diseases that were controlled through a foraging diet. Few studies consider the health impact of the recent drastic reduction of plant phytochemical content in the modern global food system, which has eliminated essential components of food because they are not considered "nutrients". The antimicrobial and anti-inflammatory nature of the food system may not only regulate infectious pathogens and inflammatory disease, but also support beneficial microbes in human hosts, reducing vulnerability to chronic diseases. Waorani foragers seem immune to certain infections with very low rates of chronic disease. Does returning to certain characteristics of a foraging food system begin to restore the human body microbe balance and inflammatory response to evolutionary norms, and if so, what implication does this have for the treatment of disease? Several years of data on dietary and health differences across the foragers and the farmers was gathered. There were major differences in health outcomes across the board. In the Waorani forager group there were no signs of infection in serious wounds such as 3rd degree burns and spear wounds. The foragers had one-degree lower body temperature than the farmers. The Waorani had an absence of signs of chronic diseases including vision and blood pressure that did not change markedly with age while Kichwa farmers suffered from both chronic diseases and physiological indicators of aging. In the Waorani forager population, there was an absence of many common regional infectious diseases, from helminthes to staphylococcus. Study design helped control for confounders (exercise, environment, genetic factors, non-phytochemical dietary intake). This study provides evidence of the major role total phytochemical dietary intake plays in human health, often not considered by policymakers and nutritional and agricultural scientists.
ContributorsLondon, Douglas (Author) / Tsuda, Takeyuki (Thesis advisor) / Beezhold, Bonnie L (Committee member) / Hruschka, Daniel (Committee member) / Eder, James (Committee member) / Arizona State University (Publisher)
Created2012
Description
This dissertation is intended to tie together a body of work which utilizes a variety of methods to study applied mathematical models involving heterogeneity often omitted with classical modeling techniques. I posit three cogent classifications of heterogeneity: physiological, behavioral, and local (specifically connectivity in this work). I consider physiological heterogeneity using the method of transport equations to study heterogeneous susceptibility to diseases in open populations (those with births and deaths). I then present three separate models of behavioral heterogeneity. An SIS/SAS model of gonorrhea transmission in a population of highly active men-who-have-sex-with-men (MSM) is presented to study the impact of safe behavior (prevention and self-awareness) on the prevalence of this endemic disease. Behavior is modeled in this examples via static parameters describing consistent condom use and frequency of STD testing. In an example of behavioral heterogeneity, in the absence of underlying dynamics, I present a generalization to ``test theory without an answer key" (also known as cultural consensus modeling or CCM). CCM is commonly used to study the distribution of cultural knowledge within a population. The generalized framework presented allows for selecting the best model among various extensions of CCM: multiple subcultures, estimating the degree to which individuals guess yes, and making competence homogenous in the population. This permits model selection based on the principle of information criteria. The third behaviorally heterogeneous model studies adaptive behavioral response based on epidemiological-economic theory within an $SIR$ epidemic setting. Theorems used to analyze the stability of such models with a generalized, non-linear incidence structure are adapted and applied to the case of standard incidence and adaptive incidence. As an example of study in spatial heterogeneity I provide an explicit solution to a generalization of the continuous time approximation of the Albert-Barabasi scale-free network algorithm. The solution is found by recursively solving the differential equations via integrating factors, identifying a pattern for the coefficients and then proving this observed pattern is consistent using induction. An application to disease dynamics on such evolving structures is then studied.
ContributorsMorin, Benjamin (Author) / Castillo-Chavez, Carlos (Thesis advisor) / Hiebeler, David (Thesis advisor) / Hruschka, Daniel (Committee member) / Suslov, Sergei (Committee member) / Arizona State University (Publisher)
Created2012
Description
Background: Adequate consumption of fruit and vegetables has been shown to prevent chronic diseases, such as cardiovascular disease, high blood pressure, and type two diabetes. The majority of Americans still consume inadequate daily servings of fruit and vegetables, which include women. Inadequate consumption of fruit and vegetables can be contributed to multiple barriers that hinder consumption in both urban and non-urban areas. The Special Supplemental Nutrition Program for Women, Infant, and Children (WIC) has been shown to positively influence fruit and vegetable consumption by providing healthy foods, such as fruit and vegetables. This study aims to compare the fruit and vegetable consumption of WIC and non-WIC participants between urban and non-urban Rural-Urban Commuting Area (RUCA) codes. Methods: This study was a cross-sectional, secondary analysis of a single time point from the Snuggle Bug/Acurrucadito Study, which had a sample size of (n=53) participants. The participants were separated into two groups, WIC participants, and non-WIC participants, and then further divided based on their respected RUCA code for comparison purposes. The assessment of fruit and vegetable consumption assessment derived from the participant’s 3-day food record. Results: The average consumption of fruit and vegetable consumption among participants was 3.8±2.5 servings There was an inverse relationship between WIC participation and fruit and vegetable consumption among all categories (fruit no juice -0.79, vegetables -0.32, vegetables no potato -0.32, fruit no juice and vegetables -1.1, and fruit no juice and vegetables no potato -1.1). However, none of the results were considered statistically significant. In addition, our study was unable to identify an association between fruit and vegetable consumption and locale due to the small sample size. Conclusions: There was no link observed between fruit and vegetable consumption and WIC participation. Further research of high quality is needed to confirm the relationship between fruit and vegetable consumption of WIC and non-WIC participants in urban and non-urban populations.
ContributorsOrtiz, Steven Michael (Author) / Bruening, Meg (Thesis advisor) / Whisner, Corrie (Committee member) / Shepard, Christina (Committee member) / Arizona State University (Publisher)
Created2022
Description
Background:The second an individual is born, the gut microbiome starts acquiring unique characteristics, including microbial richness and evenness. In addition, it has been found that during infancy, the mode of delivery, antibiotic exposure, feeding patterns, and environment play a role in such development. However, infancy is still an understudied population related to the gut microbiota, specifically its’ connection to two modifiable factors-sleep-wake patterns and its’ interconnection with feeding practices in the first year of life.
Methods:
This secondary data analysis from a randomized longitudinal intervention study assessed the efficacy of a home-based education program in preventing the onset of childhood obesity. A convenience sample of 40 Hispanic mother and infant dyads were recruited to participate in an additional collection of fecal samples to evaluate associations between lifestyle/behavioral factors in infancy and gut microbiome composition in toddlerhood. Total sleep duration and feeding practices (breastmilk and formula) were assessed at one, six, and twelve months. In addition, alpha and beta diversity metrics were assessed from infant stool samples collected at 36 months.
Results:
This study found some significant and trending values for pairwise comparisons of alpha (Shannon Diversity Index) and beta (Bray Curtis and Jaccard Distance). Sleep-wake adequacy consisted of 14-17 total hours of sleep in 24 hours at one month and 12-16 hours for six and twelve months of age. No significant values were identified at one month of age. However, six and twelve months demonstrated significant observations for gut microbial richness and evenness. Trending differences (p=.06, Shannon Diversity Index) persisted in infants receiving adequate sleep at six months but for different feeding modalities. Faith’s PD, Pielou’s measure, and observed OTUs were three additional alpha-diversity metrics performed in all groups. Observed OTUs (p=.03) and Faith’s PD (p=.03) were significant at twelve months, demonstrating an increased microbial feature in infants receiving adequate sleep.
Conclusion:
The findings from this study may show how different timestamps in the first year of life may create gut microbial milestones. However, the interrelation between sleep-wake patterns, feeding modalities, and gut microbiome development is limited; further investigation is needed to monitor close changes and potentially create a criterion
ContributorsAlanis, Victoria (Author) / Whisner, Corrie M. (Thesis advisor) / Petrov, Megan E. (Committee member) / Bruening, Meg (Committee member) / Arizona State University (Publisher)
Created2022
Description
Purpose: Although numerous studies exist regarding the health impact of the Special, Supplemental Program for Women, Infants and Children (WIC) and the Supplemental Nutrition Assistance Program (SNAP) on their participants’, limited studies have examined how participation in one federal nutrition assistance program, may impact participation or perceived benefit of the other. This study aimed to examine how SNAP participation may impact weight-related pregnancy outcomes and participation of pregnant WIC participants. Methods: The present study is a cross-sectional, secondary data analysis of data available from the Arizona Department of Health Services. A total of 35,659 pregnant woman participated in the Arizona WIC program during 2018 and were included in the study. Pregnant participants were assigned to Group WIC or Group WIC+SNAP respectively. Data was aggregated to the clinic level and clinics with less than 10 pregnant participants were combined for a total of 101 clinics included in the analysis. Weight-related pregnancy outcomes measures included average pre-pregnancy weight, average gestational weight gain, BMI class, and delivery weight. Participation indicator outcomes included average number of visits during pregnancy, timing of first prenatal and postnatal WIC appointment, and entry into WIC within the first trimester. Race, ethnicity, language, and education were also analyzed.
Results: This study found average pre-pregnancy weight was statistically significant for women in group SNAP+WIC weighing 2.8 kg more than women in group WIC(p<0.001). Group WIC had a lower delivery weight average (p<0.001) and a higher amount of women beginning pregnancy with a normal BMI (p=0.004). Group WIC participants were statistically more likely to not enroll in WIC during the first trimester compared with Group WIC+SNAP (p=0.049). Group WIC was more likely to enroll in the 8th (p=0.045) and 9th month (p=0.009) of pregnancy and attend their first postpartum visit 6 months after delivery (p=0.007) as compared to Group WIC+SNAP.
Conclusions: This study found that pregnant WIC participants, not enrolled in SNAP have a lower pre-pregnancy weight and are more likely not to enroll within the first trimester. Future research should focus on individualized characteristics of WIC participants to further improve prenatal and postnatal support.
ContributorsStolworthy, Alexandra (Author) / Bruening, Meg (Thesis advisor) / Wadhera, Devina (Committee member) / Whisner, Corrie (Committee member) / Arizona State University (Publisher)
Created2022
Description
Objectives. To determine the association between parental level of acculturation using the Anglo Orientation Subscale (AOS) and the Mexican Orientation Subscale (MOS) derived from the Acculturating Rating Scale for Mexican Americans-II (ARSMA II) and their likelihood of serving green salad, vegetables, fruit, 100% fruit juice, and sugar-sweetened beverages during family meals. Methods. A sample of Hispanic parents of 6th, 7th, or 8th-grade adolescents (n=447; 39.8±6.8 years; 89.7% female) enrolled in a parenting intervention promoting healthy nutrition and substance use prevention. Parents completed baseline surveys to self-report whether they had family meals or not, acculturation-related questions, and the frequency with which they serve green salad, vegetables, fruit, 100% fruit juice, and sugar-sweetened beverages (SSB) during family meals. Associations between parental acculturation level and their likelihood of serving green salad, vegetables, fruit, 100% fruit juice and sugar-sweetened beverages during meal times were assessed with Spearman’s rank correlations. Results. There was a positive correlation between a higher level of acculturation on the Mexican Orientation Subscale (MOS) scale and the frequency of serving SSB during family meals (p=.006). There was a positive correlation between a higher level of acculturation on the Anglo Orientation Subscale (AOS) with the frequency of parents serving green salad (p=<.001), vegetables (p=<.001), and 100% fruit juice (p=.025) during family meals. Conclusion. Findings suggest that a higher Mexican orientation is associated with serving more sugar-sweetened beverages, and a higher Anglo orientation is associated with serving more green salad, vegetables, and 100% fruit juice to adolescents during family meals. Further research is needed to understand how the association of parental acculturation, home food environment, family meals, and socioeconomic status impact what they serve during family meals to their adolescents. A better understanding of what is served would help develop more evidence-based interventions that could help improve adolescents’ diet, which could help curb down obesity prevalence.
ContributorsOdell, Sandra P (Author) / Vega-Lopez, Sonia (Thesis advisor) / Ayers, Stephanie (Committee member) / Bruening, Meg (Committee member) / Arizona State University (Publisher)
Created2023
Description
Social norms are unwritten behavioral codes. They direct individual behaviors, facilitate interpersonal coordination and cooperation, and lead to variation among human populations. Understanding how norms are maintained and how they change is critical for understanding human evolutionary psychology, social organization, and cultural change. This dissertation uses a mathematical model and a field study to answer two questions: First, what factors determine the content and dynamics of a social norm? Second, how do people make decisions in a normative context? The mathematical model finds that contrary to the popular belief that even arbitrary or deleterious social norms can be maintained once established because deviants suffer coordination failures and social sanctions, norms with continuously varying options cannot be maintained by the pressure to do what others do. Instead, continuous norms evolve to the optimum determined by environmental pressure, individual preferences, or cognitive processes. Therefore, the content of norms across human societies may be less historically constrained than previously assumed. The field study shows that unlike what rational choice theory predicts, people in a small-scale subsistence society do not calculate the ecological and social payoffs of different behaviors in a normative context, even when they have the information to do so. Instead, they rely heavily on social information about what others do. This decision-making algorithm, together with mental categorization that ignores small deviations, and cognitive biases that favor the division prescribed by the norm, maintain an ecologically inefficient and widely disliked cooperative surplus division norm in a Derung village, Dizhengdang, in Yunnan, China.
ContributorsYan, Minhua (Author) / Boyd, Robert (Thesis advisor) / Mathew, Sarah (Thesis advisor) / Hruschka, Daniel (Committee member) / Arizona State University (Publisher)
Created2023
Description
OBJECTIVE: In 2020, the COVID-19 pandemic disrupted the health and wellbeing offamilies and communities alike. The purpose of this qualitative research study was to better understand the perspectives and experiences of Arizona mothers who gave birth and transitioned to parenthood during the COVID-19 pandemic. METHODS: This research study was a qualitative thematic analysis. Arizona residents aged 18 and older who gave birth after March 2020 and spoke English proficiently were eligible to participate in this research study. Participants completed a 90-minute virtual interview, answering questions about their overall perinatal experiences during the pandemic. Interviews were recorded, transcribed and reviewed for accuracy. A codebook of themes was created. The transcriptions were analyzed and coded using Delve software. RESULTS: In total, 18 interviews were coded for this study when saturation was reached. The average participant age was 31.78 ± 5.52 years and was predominantly White (89%). In total, 61% reported experiencing birth-related trauma and approximately 60% of participants were able to take parental leave, while 40% did not. Four principal themes emerged from data describing the transition to parenthood during the COVID-19 pandemic: 1) Maternal Experiences During COVID, 2) Navigating the Support System, 3) Perinatal Healthcare Insufficiencies, and 4) Retrospective Insights. Of these four primary themes, fourteen associated subthemes were also identified. CONCLUSION: The transition to parenthood is a multidimensional ecosystem centered around maternal and infant wellbeing with family, friends, community, and healthcare providers serving as primary influences. Inadequate healthcare, broken social networks, and diminished health promotion skills that bridge families to the care and support to thrive in parenthood have been reduced during the pandemic as women in this study exhibited poor mental health, faded self-efficacy, and reduced access to care.
ContributorsHoovler, Megan (Author) / Bruening, Meg (Thesis advisor) / Bever, Jennie (Committee member) / Reifsnider, Elizabeth (Committee member) / Arizona State University (Publisher)
Created2022