Soda intake and osteoporosis risk in postmenopausal American-Indian women.

OBJECTIVE: Low bone mass often leads to osteoporosis and increased risk of bone fractures. Soda consumption may contribute to imbalances that lead to decreased bone mineral density (BMD) and general bone health. We examined the relationship between soda consumption and osteoporosis risk in postmenopausal American-Indian women, an at-risk population because of nutritional and other lifestyle-related factors. DESIGN: Cross-sectional analysis using logistic regression to examine associations between soda consumption and osteoporosis, and linear regression to examine the association between soda consumption and BMD, with and without adjustment for demographic and lifestyle factors. Quantitative ultrasound of the heel was performed to estimate BMD (g/cm2). SETTING: American-Indian communities in the Northern Plains and Southwestern USA. SUBJECTS: A total of 438 postmenopausal American-Indian women. RESULTS: Women with osteoporosis were significantly older and had lower BMI, average daily soda intakes, BMD levels and use of hormones than women without osteoporosis (P < 0·05). Soda consumption was not associated with increased odds of osteoporosis in either unadjusted or adjusted models (P > 0·05), although age (increased), BMI (decreased) and past hormone use (decreased) were all significantly associated with osteoporosis risk (P < 0·05). CONCLUSIONS: Although the present study did not find associations between soda consumption and osteoporosis risk in postmenopausal American-Indian women, analyses did confirm confounding between soda consumption and age and BMI. This suggests that any potential effects of soda consumption on bone health are largely mediated through these factors.

An introduction to qualitative research for food and nutrition professionals.

The purpose of this article is to define qualitative research, explain its design, explore its congruence with quantitative research, and provide examples of its applications in dietetics. Also, methods to ensure validity, reliability, and relevance are addressed. Readers will gain increased knowledge about qualitative research and greater competency in evaluating this type of research. The hope is that food and nutrition professionals will be inspired to conduct and publish qualitative research, adding to the body of peer-reviewed dietetics-related qualitative publications. This type of research must be methodically planned and implemented with attention to validity, reliability, and relevance. This rigorous approach boosts the probability that the research will add to the scientific literature and qualify for publication.

Publishing nutrition research: a review of sampling, sample size, statistical analysis, and other key elements of manuscript preparation, Part 2.

Members of the Board of Editors recognize the importance of providing a resource for researchers to insure quality and accuracy of reporting in the Journal. This second monograph of a periodic series focuses on study sample selection, sample size, and common statistical procedures using parametric methods, and the presentation of statistical methods and results. Attention to sample selection and sample size is critical to avoid study bias. When outcome variables adhere to a normal distribution, then parametric procedures can be used for statistical inference. Documentation that clearly outlines the steps used in the research process will advance the science of evidence-based practice in nutrition and dietetics. Real examples from problem sets and published literature are provided, as well as reference to books and online resources.

Publishing nutrition research: a review of nonparametric methods, part 3.

This is the third article in a periodic five-part series on publishing nutrition research. These monographs are designed to assist in the interpretation of the Journal of the American Dietetic Association author guidelines and provide guidance in publishing and interpreting nutrition-related research articles. This installment focuses on the use of nonparametric statistical methods. The rationale for their use, their advantages and disadvantages, nonparametric alternatives to parametric tests, nonparametric statistical analysis, examples of their use, and helpful resources for further study are topics and issues addressed in this article.

Small-grants programs: lessons from community-based approaches to changing nutrition environments.

Providing small grants to community organizations can be an effective way to encourage changes in the environment that support better nutrition. This is effective because these organizations can provide insights into their communities, ready-made relationships with community members, and the trust of the community. Small-grants programs are more likely to be successful when they are tailored to the needs of individual communities, led by organizations that have established reputations with the community, fully supported by the lead community organization, and engage local partners that complement the skills and resources of the lead organization. An evaluation of a small-grants program, Grants for Healthy Youth, found that grantees developed unique approaches to improving their community nutrition environments, gained experience and skills in program development, built partnerships, and received recognition for their project work. Grantees faced some common barriers, especially with program evaluation. Small-grants programs can be an effective way to improve community nutrition environments, but granting agencies need to provide effective technical assistance to communities throughout the process.

Publishing nutrition research: a review of study design, statistical analyses, and other key elements of manuscript preparation, Part 1.

To enhance the Journal's position as the premier source for peer-reviewed research in the science of food, nutrition, and dietetics, members of the Board of Editors recognize the importance of providing a resource for researchers to ensure quality and accuracy of reporting in the Journal. This first monograph of a periodic four-part series focuses on the study hypothesis, study design, and collaboration with a statistician. The basics of study design start with a clear hypothesis or research question and a definitive outcome measure. Throughout the development of a research project, the questions of what is to be discovered and why the research is being conducted need to be addressed. Decisions about parameters to measure and study design most appropriate to test a hypothesis create the foundation for future conclusions. Collaboration with a statistician can aid in the research development process. Documentation that coherently communicates the research process will advance the science of evidence-based practice in nutrition and dietetics. Real examples from published literature are provided, as well as references to books and online resources.

Predictors of oral mucositis in patients receiving hematopoietic cell transplants for chronic myelogenous leukemia.

PURPOSE: Oral mucositis is a nearly universal and often severe complication following hematopoietic cell transplantation (HCT). The objective of this study was to evaluate factors predicting oral mucositis severity among 133 patients undergoing allogeneic HCT for chronic myelogenous leukemia. PATIENTS AND METHODS: All patients were transplanted between 1992 and 1999, were >or= 18 years of age, received either cyclophosphamide/total-body irradiation (TBI) or busulfan/cyclophosphamide conditioning regimens, and received four doses of methotrexate for graft-versus-host disease prophylaxis post-transplant. Oral mucositis was measured by a trained examiner every 2 to 3 days using the Oral Mucositis Index (OMI). Multiple linear regression analysis was used to identify predictors of mean OMI during days 6 to 12, 1 to 18, and the maximum OMI score between days 1 to 18. RESULTS: TBI containing conditioning regimens, body mass index >or= 25, and methylenetetrahydrofolate reductase 677 TT genotype were found to be predictive of higher mean OMI scores (P <.05). Pretransplant multivitamin supplement use was associated with lower mean OMI scores compared to those who did not use supplements. Smoking status, race, pretransplant treatment with interferon-alfa or hydroxyurea, and patient/donor ABO compatibility were not associated with mean OMI scores. CONCLUSION: Patients who are scheduled to receive conditioning regimens containing TBI, have a pretransplant body mass index >or= 25, or carry the methylenetetrahydrofolate reductase 677 TT genotype should be considered at greater risk of developing oral mucositis following HCT. Future studies should investigate whether multivitamin supplementation before HCT could reduce mucositis severity.

Methylenetetrahydrofolate reductase genotype affects risk of relapse after hematopoietic cell transplantation for chronic myelogenous leukemia.

PURPOSE: Methylenetetrahydrofolate reductase (MTHFR) directs intracellular folate toward homocysteine metabolism and away from nucleotide synthesis. Two common MTHFR polymorphisms, C677T and A1298C, are associated with reduced enzyme activity. We evaluated the association of these polymorphisms with risk of relapse and bcr-abl mRNA transcript detection among 336 Caucasian patients who underwent allogeneic hematopoietic cell transplantation for chronic myelogenous leukemia. EXPERIMENTAL DESIGN: Data on the transplant course and folate-related exposures were abstracted from medical records. MTHFR C677T and A1298C genotypes were determined using polymerase chain reaction/restriction fragment length polymorphism and TaqMan assays. Qualitative bcr-abl mRNA testing was conducted using a two-step reverse transcription-polymerase chain reaction assay. Cox regression analysis was used to assess the association between MTHFR genotypes and time to relapse and bcr-abl mRNA detection. RESULTS: A statistically significant decreased risk of relapse was observed in patients with the variant A1298C genotype [1298AC, hazard ratio (HR)=0.48 and 95% confidence interval (CI)=0.26-0.88; 1298CC, HR=0.28 and 95% CI=0.09-0.84; P-trend <0.01). For the joint C677T/A1298C genotype, variant genotypes were associated with a decreased risk of relapse when compared with the wild-type 677CC/1298AA genotype. This risk was lowest for the 677CC/1298CC genotype (HR, 0.23; 95% CI, 0.08-0.72). MTHFR genotypes were not associated with bcr-abl transcript detection. CONCLUSIONS: These findings suggest that individuals with the 677CC/1298AA genotype are at higher risk of relapse after hematopoietic cell transplantation and that the balance of intracellular folate metabolites available for nucleotide synthesis (regulated by the relative activity of the MTHFR enzyme) may affect the progression from bcr-abl positivity to clinical relapse.

Measuring fruit and vegetable consumption: providing serving size information doubles estimated percent eating five per day.

Measuring the extent to which individuals meet the 5 A Day dietary recommendation for fruits and vegetables can provide information on the effectiveness of public health efforts to increase consumption of these foods. However, dietary measurement is complicated by the issue of serving size. We compared two methods of measuring fruit and vegetable consumption using a random-digit-dialed telephone survey of 917 Washington state adults. The survey included two sets of questions about fruit and vegetable consumption, one providing and the other not providing standard definitions of serving size. The specific wording of questions had a large effect on the conclusions about levels of fruit and vegetable consumption. Although only 26% of respondents met the 5 A Day recommendations without serving size information, 50% met these recommendations when using a measure that included a definition of serving size.

The association between vitamin C and vitamin E supplement use before hematopoietic stem cell transplant and outcomes to two years.

OBJECTIVE: To examine the prevalence of supplement use in persons before receiving hematopoietic stem cell transplant (HSCT) and the association of select supplements with outcomes. DESIGN: This observational cohort study included a questionnaire on supplement use before HSCT. Nonrelapse mortality, recurrence/relapse, and mortality or relapse (the inverse of disease-free survival) were followed to two years. Subjects/Setting Persons receiving HSCT at the Fred Hutchinson Cancer Research Center between September 1994 and December 1997 were eligible (N=1,182). Statistical Analyses Performed Descriptive statistics and univariate and Cox regression analyses were conducted. RESULTS: Sixty-six percent of patients used supplements (31% vitamin C, 19% vitamin E, and 20% herbs or others preparations). Vitamin C at > or =500 mg/day was inversely associated with recurrence among persons with breast cancer (RR=0.11; 95% CI, 0.02-0.89; P=.03). However, among persons with acute leukemia, vitamin C at > or =500 mg/day was positively associated with nonrelapse mortality (RR=2.25; 95% CI, 1.33-3.83; P=.01) and mortality or relapse (RR=1.63; 95% CI, 1.09-2.44; P=.01), respectively. Vitamin E at > or =400 IU/day was positively associated with mortality or relapse (RR=1.77; 95% CI, 1.06 -2.96; P=.02). Applications/Conclusions Though this work was observational, the results suggest supplemental vitamin C before therapy may be beneficial in persons with breast cancer but both vitamin C and vitamin E may increase risk in persons with acute leukemia receiving HSCT. Practitioners should document supplement use in subjects receiving therapy for cancer.

Energy, saturated fat, and sodium were lower in entrées at chain restaurants at 18 months compared with 6 months following the implementation of mandatory menu labeling regulation in King County, Washington.

BACKGROUND: Policies on menu labeling have been proposed as a method to improve the food environment. However, there is little information on the nutrient content of chain restaurant menu items and changes over time. OBJECTIVE: To evaluate the energy, saturated fat, and sodium content of entrées 6 and 18 months post-implementation of restaurant menu labeling in King County of Washington State for items that were on the menu at both time periods, and across all items at 6 and 18 months and to compare energy content to recommendations provided by the 2005 Dietary Guidelines for Americans. SETTING: Eligible restaurants included sit-down and quick-service chains (eg, burgers, pizza, sandwiches/subs, and Tex-Mex) subject to King County regulations with four or more establishments. One establishment per chain was audited at each time period. STATISTICAL ANALYSES: Hypothesis one examined entrées that were on the menu at both time periods using a paired t test and hypothesis two compared quartiles at 6 months to the distribution at 18 months using a Mantel-Haentzel odds ratios and 95% CIs, and a Cochrane-Armitage test for trend. The content of entrées at 18 months was compared with one-third (assuming three meals per day) of the nutrient intake recommendations for adults provided by the 2005 Dietary Guidelines for Americans. RESULTS: The audit included 37 eligible chains of 92 regulated chains. Energy contents were lower (all chains -41, sit down -73, and quick service -19; paired t tests P<0.0001) for entrées that were on the menu at both time periods. There was a significant trend across quartiles for a decrease in energy, saturated fat, and sodium for all entrées at sit-down chains only. At 18 months entrées not designated for children exceeded 56%, 77%, and 89% of the energy, saturated fat, and sodium guidelines, respectively. CONCLUSIONS: Modest improvements in the nutrient content of sit-down and quick-service restaurant entrées occurred but overall levels for energy, saturated fat, and sodium are excessive.

Publishing nutrition research: a review of multivariate techniques--part 2: analysis of variance.

This article is the eighth in a series exploring the importance of research design, statistical analysis, and epidemiology in nutrition and dietetics research, and the second in a series focused on multivariate statistical analytical techniques. The purpose of this review is to examine the statistical technique, analysis of variance (ANOVA), from its simplest to multivariate applications. Many dietetics practitioners are familiar with basic ANOVA, but less informed of the multivariate applications such as multiway ANOVA, repeated-measures ANOVA, analysis of covariance, multiple ANOVA, and multiple analysis of covariance. The article addresses all these applications and includes hypothetical and real examples from the field of dietetics.

Nutrition-labeling regulation impacts on restaurant environments.

BACKGROUND: Recent attempts to improve the healthfulness of away-from-home eating include regulations requiring restaurants to post nutrition information. The impact of such regulations on restaurant environments is unknown. PURPOSE: To examine changes in restaurant environments from before to after nutrition-labeling regulation in a newly regulated county versus a nonregulated county. METHODS: Using the Nutrition Environment Measures Survey-Restaurant version audit, environments within the same quick-service chain restaurants were evaluated in King County (regulated) before and 6 and 18 months after regulation enforcement and in Multnomah County (nonregulated) restaurants over a 6-month period. Data were collected in 2008-2010 and analyses conducted in 2011. RESULTS: Overall availability of healthy options and facilitation of healthy eating did not increase differentially in King County versus Multnomah County restaurants aside from the substantial increase in onsite nutrition information posting in King County restaurants required by the new regulation. Barriers to healthful eating decreased in King County relative to Multnomah County restaurants, particularly in food-oriented establishments. King County restaurants demonstrated modest increases in signage that promotes healthy eating, although the frequency of such promotion remained low, and the availability of reduced portions decreased in these restaurants. The healthfulness of children's menus improved modestly over time, but not differentially by county. CONCLUSIONS: A restaurant nutrition-labeling regulation was accompanied by some, but not uniform, improvements in other aspects of restaurant environments in the regulated compared to the nonregulated county. Additional opportunities exist for improving the healthfulness of away-from-home eating beyond menu labeling.

Publishing nutrition research: a review of multivariate techniques--part 1.

This article is the seventh in a series reviewing the importance of research design, analyses, and epidemiology in the conduct, interpretation, and publication of nutrition research. Although there are a variety of factors to consider before conducting nutrition research, the techniques used to conduct the statistical analysis are fundamental for translating raw data into interpretable findings. The statistical approach must be considered during the design phase of any study and often involves the use of multivariate analytical techniques. Multivariate analytical techniques represent a variety of mathematical models used to measure and quantify an exposure-disease or an exposure-outcome association, taking into account important factors that can influence this relationship. The primary purpose of this review is to introduce the more commonly used multivariate techniques, including linear and logistic regression (simple and multiple), and survival analyses (Kaplan Meier plots and Cox regression). These techniques are described in detail, providing basic definitions and practical examples with nutrition relevancy. An appreciation for the general principles within and presented previously in this article series is vital for enhancing the rigor in which nutrition-related research is implemented, reviewed, and published.

Publishing nutrition research: validity, reliability, and diagnostic test assessment in nutrition-related research.

This is the sixth in a series of monographs on research design and analysis. The purpose of this article is to describe and discuss several concepts related to the measurement of nutrition-related characteristics and outcomes, including validity, reliability, and diagnostic tests. The article reviews the methodologic issues related to capturing the various aspects of a given nutrition measure's reliability, including test-retest, inter-item, and interobserver or inter-rater reliability. Similarly, it covers content validity, indicators of absolute vs relative validity, and internal vs external validity. With respect to diagnostic assessment, the article summarizes the concepts of sensitivity and specificity. The hope is that dietetics practitioners will be able to both use high-quality measures of nutrition concepts in their research and recognize these measures in research completed by others.

BALANCE (Bioengineering Approaches for Lifestyle Activity and Nutrition Continuous Engagement): developing new technology for monitoring energy balance in real time.

Methods that measure energy balance accurately in real time represent promising avenues to address the obesity epidemic. We developed an electronic food diary on a mobile phone that includes an energy balance visualization and computes and displays the difference between energy intake from food entries and energy expenditure from a multiple-sensor device that provides objective estimates of energy expenditure in real time. A geographic information system dataset containing locations associated with activity and eating episodes is integrated with an ArcPad mapping application on the phone to provide users with a visual display of food sources and locations associated with physical activity within their proximal environment. This innovative tool captures peoples' movement through space and time under free-living conditions and could potentially have many health-related applications in the future.

Impact of school district sugar-sweetened beverage policies on student beverage exposure and consumption in middle schools.

PURPOSE: To determine the associations between 1) exposure to sugar-sweetened beverages (SSB) in middle schools and student consumption of SSB during the school day; and 2) school district policies about SSB and exposure to SSB in schools. METHODS: The strength of school district SSB policies was scored on three SSB policy indicators. Student SSB consumption at school was assessed by a self-administered Beverage and Snack Questionnaire. Exposure to SSB at school was defined as the number of vending slots and SSB venues as determined on-site at each school. Multivariate analysis considered the multilevel nature of the data. RESULTS: Data from 9151 students in 64 middle schools in 28 districts were used in the analysis. With schools as the unit of analysis, the proportion of students who consumed any SSB at school ranged from 19.2% to 79.8%. SSB exposure was a significant predictor of SSB consumption (beta=.157, p < .001). SSB consumption was not significantly associated with the size of the school, the racial or ethnic composition of the school's students, or the proportion of students eligible for free and reduced price meals. District SSB policy scores ranged from 0 to 6 with a mean score of 3.25 (+/-2.15). District SSB policy was a significant predictor of SSB exposure (beta=-9.50, p < .0002). CONCLUSIONS: School district SSB policies and exposure to SSB in middle schools are associated with student SSB consumption. Interventions to improve policies and their implementation may offer opportunities to improve the diets of adolescents.

Publishing nutrition research: a review of epidemiologic methods.

The use of epidemiologic research designs and analytical methods is common in dietetics research. Food and nutrition professionals who seek to perform evidence-based practice or participate in research design, analysis, and communication need skills in the essentials of epidemiology. This is one of a series of monographs on research methodology that addresses these needs and supports the goals of the Board of Editors of the Journal of the American Dietetic Association to further enhance competency and skills. This monograph focuses on statistical approaches for univariate analyses used with the primary observational study designs associated with epidemiology. Tables illustrating the presentation and interpretation of these results are included.

Worksite study promoting activity and changes in eating (PACE): design and baseline results.

OBJECTIVE: Based on previous worksite-wide intervention studies and an ecological framework, we created a behavioral intervention program to maintain or reduce weight through healthy eating and physical activity. The design and evaluation plan of the group-randomized trial and the recruitment of worksites are described. Preliminary results regarding the dietary and physical activity behaviors associated with BMI are discussed. RESEARCH METHODS AND PROCEDURES: The intervention used an ecological framework modified by qualitative methods that identified salient barriers and facilitators of behavioral change. Approximately 30 transportation, manufacturing, utilities, personal, household, and miscellaneous service companies in the greater Seattle area are being recruited to the trial. The study population for the present analysis consists of 18 worksites from the first two randomization waves. Dietary behavior was assessed, not by calories, but by behavioral measures related to BMI. Physical activity behaviors were surveyed. BMI is derived from reported height and weight at baseline. RESULTS: The intervention has been developed with a specified minimum suite of strategies within the defined framework. Response rates to the baseline survey among the 18 worksites are 81% on average. After adjusting for age, gender, race, and education, BMI was associated with frequency of intensity-adjusted physical activity, sweat-inducing exercise, fast food meals, soft drinks, eating while doing another activity, and fruit and vegetable intake. DISCUSSION: Worksite-wide intervention strategies can be adapted to target obesity prevention. Employees are willing to participate in surveys at high rates. Several measures of physical activity and eating choices are associated with baseline BMI.