Theses and Dissertations
This collection includes both ASU Theses and Dissertations, submitted by graduate students, and the Barrett, Honors College theses submitted by undergraduate students.
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Description
In the last five decades, the prevalence of chemicals added to food to enhance its color, texture, flavor, and freshness has increased. These chemicals, known as food additives, are synthetically derived or chemically altered substances that are added to food during processing to achieve a specialized effect. Additives are regulated by the United States Food and Drug Administration and while many are “generally recognized as safe” (GRAS), some emerging research suggests that their safety rulings need to be reexamined.
Considering food additives in one’s diet is of the utmost importance for health, though it can be problematic for those with limited knowledge of additives or nutrition. Common opinion is that good nutrition involves only what is or is not being consumed—calories, fat, etc. But the realm of nutrition depends on quality of food—whole, minimally processed food that subsequently lacks additives—as much as it does the composition of food.
This paper reviews eight of the most common and often problematic food additives in America: high fructose corn syrup, aspartame, sodium nitrate/ sodium nitrite, partially hydrogenated vegetable oil (trans fat), monosodium glutamate (MSG), benzoate preservatives (BHA and BHT), potassium bromate, and caramel coloring. It is important to note that this list is far from comprehensive; these additives receive much attention in America making them some of the most talked about and most easily recognized additives.
This paper aims to present sound depictions of existing research that most often refutes the validity of the “generally recognized as safe” claim currently standing for these food additives, providing consumers with reliable information with which they can make educated decisions when purchasing food and eating healthfully.
Considering food additives in one’s diet is of the utmost importance for health, though it can be problematic for those with limited knowledge of additives or nutrition. Common opinion is that good nutrition involves only what is or is not being consumed—calories, fat, etc. But the realm of nutrition depends on quality of food—whole, minimally processed food that subsequently lacks additives—as much as it does the composition of food.
This paper reviews eight of the most common and often problematic food additives in America: high fructose corn syrup, aspartame, sodium nitrate/ sodium nitrite, partially hydrogenated vegetable oil (trans fat), monosodium glutamate (MSG), benzoate preservatives (BHA and BHT), potassium bromate, and caramel coloring. It is important to note that this list is far from comprehensive; these additives receive much attention in America making them some of the most talked about and most easily recognized additives.
This paper aims to present sound depictions of existing research that most often refutes the validity of the “generally recognized as safe” claim currently standing for these food additives, providing consumers with reliable information with which they can make educated decisions when purchasing food and eating healthfully.
ContributorsJones, Haley Brooke (Author) / Larsen, Dale (Thesis director) / Wharton, Christopher (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor) / School of Nutrition and Health Promotion (Contributor)
Created2014-05
Description
Gastrointestinal (GI) complaints are prevalent among athletes. Fermented foods with pre-or probiotic features may relieve GI symptoms by improving gut health. This study aimed is to examine the impact of a nutritional supplement containing fermented whey protein with Galacto-oligosaccharide (GOS) fiber on GI distress among well-trained athletes over time by analyzing self-reported GI complaints without a control group. This quasi-experimental clinical trial consisted of a 3-week baseline period, reflected by two baseline measurements on Day 1 and Day 22, which was followed by a 3-week intervention period, reflected by a post-intervention measurement on Day 43, in which athletes added 15g of a fermented whey protein product to their diet. The primary outcome was based on the self-reported gastrointestinal symptom rating scale (GSRS), and the secondary outcome was based on a daily questionnaire, in which daily GI complaints and exercise occurrences were reported. Tertiary outcomes included a 24-hour diet recall (ASA24) and self-reported diet quality (REAP). Outcomes obtained during baseline (Day 1 and Day 22 average) were compared to those post-intervention (Day 43). Statistical significance was set at P<0.05. A total of n=50 athletes (24.7±4.5 years) with GI issues were included in the study. Five individual items of the GSRS including abdominal pain, acid reflux, bloating, burping, and loose stools reflected significantly lower scores on Day 43 in comparison to baseline (P≤0.028). A total of 78% reported GI complaints at baseline, and 61% of the participants reported lower GI complaints on Day 43 after supplementation in comparison to baseline (P=0.004). Further research is needed to explore the potential benefits of a hydrolyzed and fermented whey protein with prebiotics in a more controlled setting among athletic populations.
ContributorsClear, Anna Marie Grace (Author) / Wardenaar, Floris (Thesis advisor) / Johnston, Carol (Committee member) / Wharton, Christopher (Committee member) / Arizona State University (Publisher)
Created2023
Description
Sleep is an essential biological requirement to sustain human life and a critical component for athletes. There has been a rising trend for poor sleep in the general population and the problem persists as well within the athletic population. Research has demonstrated numerous benefits of optimized sleep on athletic performance and athlete wellness. Further investigation of potential dietary strategies to improve self-perceived sleep quality is warranted. This study examined the differences in perceived sleep quality and wellness between a 3-week baseline period and after a 3-week supplementation period, in which participants consumed a dietary supplement containing fermented whey protein + galacto-oligosaccharides (GOS) + casein protein daily. Validated questionnaires, namely, Athens Insomnia Scale (AIS), Physical Health Questionnaire (PHX), Kessler-6 Mental Stress Scale (K6) were used to measure perceived sleep quality and wellness on Day 1, Day 22 and Day 43. Additionally, multiple 24-h dietary recalls (ASA24), and food quality using the validated Rapid Eating Assessments for Participants (REAP) questionnaire, were used to assess dietary patterns throughout the study, while exercise occurrence was tracked through a self-developed daily questionnaire. A total of 54 healthy active adults (age=18-35yrs) experiencing gastro-intestinal (GI) complaints were included in the trial, and 50 participants were included in the final analysis. Significantly lower AIS-8 total scores were found on Day 43 compared to Day 22 while controlled for Day 1 (Day 43: 4.36 ± 3.68 versus Day 22: 5.02 ± 4.11, F=4.379 (1, 50), p=0.042), while no differences were found for wellbeing (p≥ 0.180). Dietary intake, food quality and exercise frequency did not change over time (p≥0.080). These results suggested that a daily protein + GOS supplement was associated with a decrease in AIS-8 total scores suggesting improved perceived sleep quality among athletes after 3 weeks. A controlled research study should confirm these results in the future. More research is required to assess the effects of protein + prebiotic supplementation on sleep parameters among athletes.
ContributorsChan, Yat (Author) / Wardenaar, Floris (Thesis advisor) / Johnston, Carol (Committee member) / Wharton, Christopher (Committee member) / Arizona State University (Publisher)
Created2023
Description
Background: Vegan and vegetarian diets have gained in popularity in recent years. Stated reasons for this include some possible health benefits and concerns of animal welfare. Though considered to be nutritionally adequate, questions remain over whether current protein recommendations of 0.8 g/kg/d are sufficient to maintain body processes and growth. Protein is unique in that it is the only macronutrient that contains nitrogen. Its status can be determined through nitrogen balance analysis of the urine if protein content of the diet is known. Nitrogen balance is considered the gold standard for determining protein intake requirements. A negative balance indicates a catabolic state, whereas a positive nitrogen balance is seen during anabolism. In healthy people, nitrogen equilibrium is desired under normal circumstances. This equilibrium reflects the net synthesis and breakdown of proteins. While nitrogen balance techniques have been used for decades, currently, there are no known studies measuring nitrogen balance and protein intake in strict vegans. Methods: Twenty vegan, inactive, male participants were recruited and received a 5-day eucaloric diet with a known protein content held constant at 0.8 g/kg/d. On day five, 24-hour urine was collected by participants and aliquoted for future analysis. Nitrogen content of the urine was determined through photometric assay and compared to the known nitrogen content of the diet to calculate nitrogen balance status.
Results: Mean absolute nitrogen balance (-1.38 ± 1.22 g/d, effect size = -1.13) was significantly lower than zero (equilibrium) (p < .001). Mean relative nitrogen balance (-18.60 ± 16.96 mg/kg/d, effect size = -1.10) was significantly lower than zero (p < .001). There were no correlations seen between nitrogen balance and age, years as vegan, or fat- free mass.
Conclusion: Consuming 0.8 g/kg/d of protein is insufficient to produce nitrogen balance in long-term vegans.
ContributorsBartholomae, Eric (Author) / Johnston, Carol (Thesis advisor) / Sweazea, Karen (Committee member) / Wharton, Christopher (Committee member) / Lee, Chong (Committee member) / Kressler, Jochen (Committee member) / Arizona State University (Publisher)
Created2022
Description
Nutritional supplements (the combination of dietary supplements, sports foods, and performance-enhancing supplements) are used by many athletes for health and/or performance-related reasons. Nutritional supplements may be contaminated with illegal substances, putting the athlete at risk of adverse health outcomes or a positive doping test. Third-party testing programs help mitigate risk by regulating the purity and safety of supplements. However, it is unknown what percentage of high school athletes are familiar with third-party testing programs and how many athletes use such programs. This study was designed to explore high school athletes’ use of nutritional supplements, whether they were third-party tested, and their attitudes and influences toward safe(r) nutritional supplement use. An online questionnaire was developed to distribute among student-athletes from a private high school in the western US, resulting in a representative sample (n=225). Ninety-four percent (n = 211) of the student-athlete population reported using at least one nutritional supplement within the past year, reporting six different supplements on average. Sports foods were used the most (87%), followed by dietary supplements (76%), and then supplements claiming to enhance performance (58%). The most frequently reported nutritional supplements were sports drinks (72%), vitamins (65%), sports bars (60%), protein powder (58%), recovery drinks (46%), and multivitamin/mineral supplements (40%). One-fourth of student-athletes reported consistent use of third-party tested supplements. Reasons for supplement use include gaining muscle (48%), improving health (46%), improving performance (44%), and losing or gaining weight (29%). Parents (45%) had the most influence on the athlete’s purchasing of supplements, followed by friends, teammates, or other family members (40%), the physician (30%), head sports coach (26%), strength and conditioning coach (25%), and athletic trainer (24%). The sports dietitian was checked by 8% of students as influential. The biggest gap in knowledge was where to find third-party tested supplements (22% knowledgeable) and where to order third-party tested supplements (25% knowledgeable). Based on the results, high school athletes would likely benefit from increased education regarding third-party testing programs and should increase their knowledge of where to find and purchase third-party tested supplements.
ContributorsLybbert, Hannah (Author) / Wardenaar, Floris (Thesis advisor) / Wharton, Christopher (Committee member) / Levinson, Simin (Committee member) / Arizona State University (Publisher)
Created2024
Description
Nutritional supplement use by high school student athletes may pose risks of consuming prohibited or banned substances that can result in suspension of athletic participation. Currently, there is no peer-reviewed published data that exists on the use of supplements and use of third-party tested supplements for this population. When looking at supplement use, the Theory of Planned Behavior (TPB) can be utilized. This model was designed to determine if the intention of completing a behavior is based on three different constructs which include attitude, subjective norm, and perceived behavioral control. A pre- and post- test questionnaire was used to determine the effect of an educational intervention that was designed and developed. A total of 106 high school student athletes, ranging from 14-19 years of age from a private high school in the western US were included in the analysis of the study. The intention to use a good basic diet and intention to use nutritional supplements were both predicted by attitude, subjective norm, and perceived behavioral control and both resulted in a significant regression equation (p < .001). There was 95.3% (n=101) of athletes that reported use of at least one supplement in the last 12 months with reporting on average eight supplements ranging from 0-31 supplements. In conclusion, almost all high school student athletes reported using at least one nutritional supplement in the last 12 months, while roughly one-fourth consistently reported to use third-party tested nutritional supplements. The TPB based supplement education program resulted in the intention to change supplement behavior toward using safe third-party tested supplements more frequently at a group level.
ContributorsMorton, Lindsay (Author) / Wardenaar, Floris (Thesis advisor) / Wharton, Christopher (Committee member) / Levinson, Simin (Committee member) / Arizona State University (Publisher)
Created2024