Monday, May 03, 2010

Research Highlights - May

American Journal of Clinical Nutrition
  • The overall effect of adding the spice mixture (in this case, oregano) to hamburger meat before cooking was a reduction in malondialdehyde concentrations in the meat, plasma, and urine after ingestion. Therefore, cooking hamburgers with a polyphenol-rich spice mixture can significantly decrease the concentration of
    malondialdehyde, which suggests potential health benefits for atherogenesis and carcinogenesis.
  • In comparison with the steamed diet, 1 mo of consuming the high-heat-treated diet induced significantly lower insulin sensitivity and plasma concentrations of long-chain n–3 (omega-3) fatty acids and vitamins C and E, respectively. However, concentrations of plasma cholesterol and triglycerides increased. A diet that is based on high-heat-treated foods increases markers associated with an enhanced risk of type 2 diabetes and cardiovascular diseases in healthy people. Replacing high-heat-treatment techniques by mild cooking techniques may help to positively modulate biomarkers associated with an increased risk of diabetes mellitus and cardiovascular diseases.
  • Vitamin D3 supplementation during the winter may reduce the incidence of influenza A, especially in specific subgroups of schoolchildren.
  • Higher protein intake does not have an adverse effect on bone in premenopausal women. Cross-sectional analyses suggest that low vegetable protein intake is associated with lower BMD.

Journal Nutrition
  • Coffee contains various compounds that have recently been reported to exert beneficial health effects. 37,742 participants (18,287 men and 19,455 women) aged 40–64 y without a history of cancer, myocardial infarction, or stroke at baseline in our analysis, based on the Miyagi Cohort Study initiated in 1990, were studied. The outcomes were mortality due to all causes, cardiovascular disease (CVD), and cancer. During the 10.3 y of follow-up, our results suggest that coffee may have favorable effects on morality due to all causes and to CVD, especially CHD, in women.

American Journal of Preventive Medicine
  • Every 5 years for the past several decades, the USDHHS and the U.S. Department of Agriculture have issued and updated the Dietary Guidelines for Americans, which form the basis of federal nutrition policy and have shown remarkable consistency across various editions among the major themes. This paper examines whether the U.S. food supply is sufficiently balanced to provide the recommended proportions of various foods and nutrients per the amount of energy, whether this balance has shifted over time, and which areas of the food supply may have changed more than others.

    The Healthy Eating Index-2005 (HEI-2005) was used to measure the dietary quality of the U.S. food supply, from 1970 to 2007. Sources of data were the USDA's food availability data, loss-adjusted food availability data, and nutrient availability data, and the U.S. Salt Institute's data on salt sold for human consumption.

    Total HEI-2005 scores improved by about 10 points between 1970 and 2007, but they never achieved even 60 points on a scale from 0 to 100. Although meats and total grains were supplied generally in recommended proportions, total vegetables, total fruit, whole fruit, and milk were supplied in suboptimal proportions that changed very little over time. Saturated fat, sodium, and calories from solid fat, alcoholic beverages, and added sugars were supplied in varying degrees of unhealthy abundance over the years. Supplies of dark-green/orange vegetables and legumes and whole grains were entirely insufficient relative to recommendations, with virtually no change over time.

    Deliberate efforts on the part of policymakers, the agriculture sector, and the food industry are necessary to provide a supply of foods consistent with nutrition recommendations and to make healthy choices available to all.
  • In 1998, the IOM recommended all women capable of becoming pregnant consume 400 μg of folic acid daily to prevent neural tube defects. This paper aims to describe how different sources of folic acid contribute to achieving the recommended usual daily intake. Overall, 24% of nonpregnant U.S. women of childbearing age consumed the recommended usual intake. Intake was highest among non-Hispanic white women (30%), followed by Mexican-American (17%) and non-Hispanic black women (9%). Among women who used supplements with folic acid, 72% consumed the recommended usual intake. Use of supplements was the strongest determinant of recommended intake, mediating associations of other characteristics. Among the 68% of women who did not use supplements, consumption of cereals with folic acid and having diabetes were the strongest determinants of recommended usual intake. Given that consumption of folic acid is an important public health goal to prevent NTDs, an evaluation of strategies, beyond recommendations that women consume supplements, is needed. Health education programs for promoting a healthful diet have shown limited success in clinical trials.
  • This paper aims to examine whether an innovative educational course focused on societal-level issues related to food and food production would promote healthful eating among college students. The students who took the Food and Society course reported significantly improving their healthful eating, with greatest improvements in increased vegetable and decreased high-fat dairy intakes relative to the comparison group. The results suggest that it may be possible to change dietary behaviors in college students by focusing on social, ethical, cultural, and environmental issues related to food and food production.

The Lancet
  • Lp-PLA2 activity and mass each show continuous associations with risk of coronary heart disease, similar in magnitude to that with non-HDL cholesterol or systolic blood pressure in this population. Associations of Lp-PLA2 mass and activity are not exclusive to vascular outcomes, and the vascular associations depend at least partly on lipids.

Food and Chemical Toxicology
  • Curcumin mitigates the genotoxic effects of the two well known water contaminants (Arsenic and Fluoride) effectively and efficiently at the given concentration in vitro.

Nutrition and Metabolism
  • This study investigated effects of 6-week consumption of whole grain wheat sourdough bread in comparison to white bread on fasting serum lipids in normoglycemic/normoinsulinemic and hyperglycemic/hyperinsulinemic adults. HGI participants had significantly higher body weight, waist circumference, body fat, and fasted glucose, insulin, homeostasis model assessment of insulin resistance, glucagon, triacylglycerols and TAG:HDL-cholesterol, compared to NGI participants. However, none of these in addition to none of the other serum lipids, differed between bread treatments, within either participant group.

    In summary, 6-week consumption of whole grain wheat sourdough bread did not significantly modulate serum lipids in NGI or HGI adults. However, it significantly increased LDL-cholesterol, TAG and TAG:HDL-cholesterol in participants with the APOE E3/E3 genotype.

Journal of Allergy & Clinical Immunology
  • Corticosteroid use and worsening airflow limitation are associated with lower VitD serum levels in asthmatic patients. VitD enhances glucocorticoid action in PBMCs from asthmatic patients and enhances the immunosuppressive function of DEX in vitro.
  • Infants with likely milk/egg allergy are at considerably high risk of having increased peanut-specific IgE levels (potential allergy).



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