Matching Items (3)
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- All Subjects: Taste
- All Subjects: Mexican American women
- Genre: Doctoral Dissertation
- Creators: Homer, Judith
- Creators: Capaldi Phillips, Elizabeth D
Description
The unpleasant bitter taste found in many nutritious vegetables may deter their consumption. While bitterness suppression by prototypical tastants is well-studied in the chemical and pharmacological fields, mechanisms to reduce the bitterness of foods such as vegetables remain to be elucidated. Here tastants representing the taste primaries of salty and sweet were investigated as potential bitterness suppressors of three types of Brassicaceae vegetables. The secondary aim of these studies was to determine whether the bitter masking agents were differentially effective for bitter-sensitive and bitter-insensitive individuals. In all experiments, participants rated vegetables plain and with the addition of tastants. In Experiments 1-3, sucrose and NNS suppressed the bitterness of broccoli, Brussels sprouts, and cauliflower, whereas NaCl did not. Varying concentrations of NaCl and sucrose were introduced in Experiment 4 to assess the dose-dependency of the effects. While sucrose was a robust bitterness suppressor, NaCl suppressed bitterness only for participants who perceived the plain Brussels sprouts as highly bitter. Experiment 5, through the implementation of a rigorous control condition, determined that some but not all of this effect can be accounted for by regression to the mean. Individual variability in taste perception as determined by sampling of aqueous bitter, salty, and sweet solutions did not influence the degree of suppression by NaCl or sucrose. Consumption of vegetables is deterred by their bitter taste. Utilizing tastants to mask bitterness, a technique that preserves endogenous nutrients, can circumvent this issue. Sucrose is a robust bitter suppressor whereas the efficacy of NaCl is dependent upon bitterness perception of the plain vegetables.
ContributorsWilkie, Lynn Melissa (Author) / Capaldi Phillips, Elizabeth D (Thesis advisor) / Cohen, Adam (Committee member) / Johnston, Carol (Committee member) / Sanabria, Federico (Committee member) / Arizona State University (Publisher)
Created2014
Description
Given the continued increase in obesity rates in the United States, there has been growing research regarding factors related to obesity. Researchers have examined biological factors, such as set point theory, as well as various psychological factors such as motivation, self-efficacy, and eating styles. Taster-type, defined as how an individual experiences the perception of taste (particularly bitterness), is a recent area of research that has explored the potential relationship between this phenomenon and obesity. The current study examined whether taster-type impacted weight loss, along with secondary measures of BMI, waist circumference, and food neophobia, as well as taster-type’s impact on these measures over time. This study also examined the potential role of taster-type as a predictor of weight loss, independent of the psychological variables of motivation, self-efficacy, and eating styles. Ninety adult participants, consisting of 64 females and 19 males were recruited for this study. They were asked to diet for four weeks; 60 finished the full four weeks and completed psychosocial measures over two time periods. They were asked to record their food using an online food journal, attend weekly meetings for weigh-ins, and were given psychoeducational materials regarding factors affecting weight loss. The results indicated that taster-type was not a significant factor in BMI or waist circumference, but taster-type did interact with time to reveal that supertasters consistently lost weight across the four week dieting period while nontasters leveled off after Week 2. Additionally, both groups increased in food neophobia from the start of the dieting period to the end of Week 4. Consistent with previous research, motivation and self-efficacy predicted weight loss; however, taster-type did not increase the prediction of weight loss across the dieting period. This effect only occurred at Week 2. By Week 4, no psychosocial variables were significant predictors of weight loss.
ContributorsWagner, Melissa C (Author) / Robinson-Kurpius, Sharon (Thesis advisor) / Capaldi Phillips, Elizabeth (Committee member) / Homer, Judith (Committee member) / Arizona State University (Publisher)
Created2016
Description
Previous research indicates that survivors of Intimate Partner Violence (IPV) are at a greater risk of developing Posttraumatic Stress Disorder (PTSD) symptomatology. IPV survivors often use maladaptive coping strategies in response to IPV that place them at a higher risk for PTSD. Cultural gender roles/beliefs have been known to influence coping methods. Marianismo, a Latino/a gender role belief, has not been investigated in relation to IPV, coping strategies, and PTSD among Latinas. This study examined whether physical, psychological, or sexual abuse by a romantic partner, coping strategies, and Marianismo were associated with PTSD symptomatology among 157 college-aged Latinas. The participants completed an on-line survey that assessed IPV frequency, disengaged and engaged coping, Marianismo, and PTSD symptomatology. Hierarchical multiple regressions revealed that, regardless of IPV type, more IPV and disengaged coping strategies were the best predictors of PTSD symptomatology. Marianismo did not significantly moderate the relation between coping and PTSD. However, the strong zero-order correlation between disengaged coping and Marianismo indicated they were highly correlated variables. The study findings are consistent with previous research that suggested that coping strategies are culturally dependent on beliefs and gender role expectations. Latinas may use more disengaged coping strategies because these methods may be deemed more culturally appropriate and reflect Marianismo beliefs. Psychologists working with Latina IPV survivors need to develop culturally sensitive approaches to psychoeducation on IPV and coping strategies that empower these women within their cultural belief systems and reduce their PTSD symptomatology.
ContributorsTorres, Dhannia L (Author) / Kurpius, Sharon (Thesis advisor) / Roberts, Nicole A. (Committee member) / Homer, Judith (Committee member) / Arizona State University (Publisher)
Created2017