Vitamin B12 and Homocysteine Levels Predict Different Outcomes in Early Parkinson's Disease.

BACKGROUND: In moderately advanced Parkinson's disease (PD), low serum vitamin B12 levels are common and are associated with neuropathy and cognitive impairment. However, little is known about B12 in early PD. OBJECTIVE: To determine the prevalence of low vitamin B12 status in early PD and whether it is associated with clinical progression. METHODS: We measured vitamin B12 and other B12 status determinants (methylmalonic acid, homocysteine, and holotranscobalamin) in 680 baseline and 456 follow-up serum samples collected from DATATOP participants with early, untreated PD. Borderline low B12 status was defined as serum B12 <184 pmol/L (250 pg/mL), and elevated homocysteine was defined as >15 µmol/L. Outcomes included the UPDRS, ambulatory capacity score (sum of UPDRS items 13-15, 29&30), and MMSE, calculated as annualized rates of change. RESULTS: At baseline, 13% had borderline low B12 levels, 7% had elevated homocysteine, whereas 2% had both. Elevated homocysteine at baseline was associated with worse scores on the baseline MMSE. Analysis of study outcomes showed that compared with the other tertiles, participants in the low B12 tertile (<234 pmol/L; 317 pg/mL) developed greater morbidity as assessed by greater annualized worsening of the ambulatory capacity score. Elevated homocysteine was associated with greater annualized decline in MMSE (-1.96 vs. 0.06; P = 0001). Blood count indices were not associated with B12 or homocysteine status. CONCLUSIONS: In this study of early PD, low B12 status was common. Low B12 at baseline predicted greater worsening of mobility whereas elevated homocysteine predicted greater cognitive decline. Given that low B12 and elevated homocysteine can improve with vitamin supplementation, future studies should test whether prevention or early correction of these nutritionally modifiable conditions slows development of disability. © 2018 International Parkinson and Movement Disorder Society.

Relationship between insulin resistance-associated metabolic parameters and anthropometric measurements with sugar-sweetened beverage intake and physical activity levels in US adolescents: findings from the 1999-2004 National Health and Nutrition Examination Survey.

OBJECTIVE: To evaluate the relationship between insulin resistance-associated metabolic parameters and anthropometric measurements with sugar-sweetened beverage intake and physical activity levels. DESIGN: A cross-sectional analysis of the National Health and Nutrition Examination Survey data collected by the National Center for Health Statistics. SETTING: Nationally representative samples of US adolescents participating in the National Health and Nutrition Examination Survey during the years 1999-2004. PARTICIPANTS: A total of 6967 adolescents aged 12 to 19 years. MAIN EXPOSURE: Sugar-sweetened beverage consumption and physical activity levels. OUTCOME MEASURES: Glucose and insulin concentrations, a homeostasis model assessment of insulin resistance (HOMA-IR), total, high-density lipoprotein, and low-density lipoprotein cholesterol concentrations, triglyceride concentrations, systolic and diastolic blood pressure, waist circumference, and body mass index (calculated as weight in kilograms divided by height in meters squared) percentile for age and sex. RESULTS: Multivariate linear regression analyses showed that increased sugar-sweetened beverage intake was independently associated with increased HOMA-IR, systolic blood pressure, waist circumference, and body mass index percentile for age and sex and decreased HDL cholesterol concentrations; alternatively, increased physical activity levels were independently associated with decreased HOMA-IR, low-density lipoprotein cholesterol concentrations, and triglyceride concentrations and increased high-density lipoprotein cholesterol concentrations. Furthermore, low sugar-sweetened beverage intake and high physical activity levels appear to modify each others' effects of decreasing HOMA-IR and triglyceride concentrations and increasing high-density lipoprotein cholesterol concentrations. CONCLUSIONS: Sugar-sweetened beverage intake and physical activity levels are each independently associated with insulin resistance-associated metabolic parameters and anthropometric measurements in adolescents. Moreover, low sugar-sweetened beverage intake and high physical activity levels appear to modify each others' effects on several health-related outcome variables.

Vitamin and mineral supplement use by children and adolescents in the 1999-2004 National Health and Nutrition Examination Survey: relationship with nutrition, food security, physical activity, and health care access.

OBJECTIVE: To determine if vitamin and mineral supplement use among children and adolescents in the United States is associated with nutrition, food security, physical activity, and health care access. DESIGN: Secondary analysis of nationally representative data from the 1999-2004 National Health and Nutrition Examination Survey. SETTING: Questionnaires, household interviews, and medical examinations. PARTICIPANTS: Children and adolescents 2 to 17 years of age (N = 10 828). MAIN EXPOSURE: Vitamin and mineral supplement use in the past month. MAIN OUTCOME MEASURES: Demographics, nutrition, food security, physical activity, and health care access. RESULTS: Approximately 34% (SE 1.2) used vitamin and mineral supplements in the past month, with underweight subjects reporting greater intake. Younger age, non-Hispanic white race/ethnicity, being born in the United States, higher milk intake, lower total fat and cholesterol intake, higher dietary fiber intake, higher income, greater food security, lower media/computer use, greater physical activity, lower body mass index, health insurance coverage, better health care access, and better self-reported health were associated with greater use of vitamin and mineral supplements. Such supplements contributed significantly to total daily dietary intakes of vitamins and minerals. CONCLUSIONS: A large number of US children and adolescents use vitamin and mineral supplements, which for most may not be medically indicated. Such supplements contribute significantly to total dietary intakes of vitamins and minerals, and studies of nutrition should include their assessment. Since vitamin and mineral supplement users report greater health care access, health care providers may be in a position to provide screening and counseling regarding dietary adequacy and indications for supplement use.

Full breastfeeding duration and risk for iron deficiency in U.S. infants.

BACKGROUND: National and international authorities recommend exclusive breastfeeding for an infant's first 6 months. Effects of these recommendations on iron status of U.S. children are unknown. OBJECTIVE: To ascertain if full breastfeeding for 6 months versus 4 months places U.S. children at greater risk for iron deficiency. DESIGN/METHODS: Data regarding 2268 children ages 6 to <24 months from NHANES III, a nationally representative cross-sectional survey conducted from 1988-1994, were analyzed. Similar analyses were conducted for 526 children ages 12 to <24 months from NHANES 1999-2002. Anemia (low hemoglobin or history of anemia) and iron status (serum ferritin) were compared for five groups: formula fed only (n = 1142), or full breastfeeding for: 1 month "FullBF<1" (n = 425), 1 to <4 months "FullBF1-3+" (n = 343), 4 to <6 months "FullBF4-5+" (n = 222), and >or= 6 months "FullBF6" (n = 136). Laboratory data were available for children 12 to 24 months (n = 745). SUDAAN software was used to account for the complex sampling design. Logistic regression adjusted for confounding factors. RESULTS: In unadjusted analyses (NHANES III), 10.0% of "FullBF6+" versus 2.3% of "FullBF4-5+" had a history of anemia (p = 0.007) but unadjusted between group serum ferritin and hemoglobin differences were insignificant in both surveys. Adjusting for birth weight and demography revealed persistently lower risk of history of anemia (NHANES III, odds ratio [OR] 0.20, confidence interval [CI] 0.06, 0.63) and low serum ferritin (NHANES 1999-2002, OR 0.19, CI 0.06, 0.57) but not low hemoglobin at time of survey "FullBF4-5+" versus "FullBF6." CONCLUSIONS: Young children in the United States fully breastfed for 6 months may be at increased risk of iron deficiency. Adequate iron may not be provided by typical complementary infant foods. Healthcare providers should be vigilant to prevent iron deficiency in this group of infants.

Visits to complementary and alternative medicine providers by children and adolescents in the United States.

OBJECTIVE: Determine the prevalence, patterns, costs, and predictors of visits to complementary and alternative medicine (CAM) providers and subsequent remedy use in a nationally representative pediatric sample. METHODS: The 1996 Medical Expenditure Panel Survey provided data on 7371 subjects < or =21 years of age. The primary outcome variable was CAM provider visits as defined by consulting a CAM provider "for health reasons." Predictors included sociodemographics, family resources, health status, parental CAM use, and perceptions and use of conventional medical care. Bivariate analyses and logistic regression determined independent factors associated with CAM use. RESULTS: Overall, 2.0% used CAM. Only 12.3% disclosed this use to their usual source of care (USC). The most common providers were chiropractors and clergy or spiritualists. The most common therapies were herbal remedies and spiritual healing. Mean amount spent per person on CAM visits was 73.40 US dollars and on remedies was 13.06 US dollars. Weighted estimates to the national pediatric population of annual expenditures on CAM visits and remedies were 127 million US dollars and 22 million US dollars, respectively. Significant factors independently associated with CAM visits were female gender, older age, good and very good perceived physical health as compared with excellent health, parental CAM use, and dissatisfaction with the quality of care received from the USC. CONCLUSIONS: Two percent of parents reported that their children consulted a CAM provider and rarely disclosed this use to their USC. While dissatisfaction with the quality of care by the USC and less good perceived physical health predicted CAM visits, parental CAM use was the most predictive.