Nutrition
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Randomized Controlled Trial
5-aminolevulinic acid, a precursor of heme, reduces both fasting and postprandial glucose levels in mildly hyperglycemic subjects.
The aim of this study was to evaluate the combined effects of 5-aminolevulinic acid phosphate (ALA-P) and iron on the glycemic index in mildly hyperglycemic adults. ⋯ An oral intake of ALA would be a novel approach to prevent type 2 diabetes mellitus.
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Randomized Controlled Trial
Short-term folinic acid supplementation improves vascular reactivity in HIV-infected individuals: a randomized trial.
HIV-infected individuals present a cluster of conditions that activate or injure the vascular endothelium. The administration of folates may exert beneficial effects on endothelial function in different populations at risk for cardiovascular disease. The aim of this study was to determine the effects of 4 wk of folinic acid supplementation on forearm vascular responses during reactive hyperemia in HIV-infected patients under highly active antiretroviral therapy. ⋯ Short-term folinic acid supplementation improved vascular reactivity in HIV-infected individuals enrolled in the studied. As folate supplementation is safe and relatively inexpensive, long-term clinical trials should be conducted.
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Randomized Controlled Trial
Glycemic response to carbohydrate and the effects of exercise and protein.
The purpose of this study was to investigate the effects of pre-exercise and protein coingestion on the glycemic response to carbohydrates. ⋯ Coingestion of protein with carbohydrate reduces glycemic response and increases insulinemic response in healthy subjects, whereas pre-exercise seems to have no effect.
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Randomized Controlled Trial
The effect of hyperhomocysteinemia on aortic distensibility in healthy individuals.
Elevated plasma homocysteine (HCY) levels have been associated with increased risk for cardiovascular disease. Aortic distensibility and aortic pulse wave velocity (PWV) are indices of aortic elasticity. The potential effect of acute hyperhomocysteinemia (HHCY) on the elastic properties of the aorta in healthy individuals is not known. The aim of the present study was to determine the effect of acute methionine-induced HHCY on aortic distensibility and PWV in healthy individualsand the effect of acute HHCY on myocardial performance of the left ventricle (Tei index). ⋯ Acute methionine-induced HHCY reduces aortic distensibility and worsens myocardial performance in healthy individuals. Further research is warranted to examine in the long term the direct effects of HHCY on cardiovascular function and the indirect effects on structural remodeling.
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Randomized Controlled Trial Multicenter Study
Short-term preoperative supplementation of an immunoenriched diet does not improve clinical outcome in well-nourished patients undergoing abdominal cancer surgery.
A recent study suggested that the anti-inflammatory effect of immunonutrition starts after only two d. We therefore investigated the effect of an immunoenriched oral diet administered for three d preoperatively. ⋯ Preoperative oral supplementation with an immunoenriched diet for 3 d preoperatively did not improve postoperative outcome compared with the placebo in well-nourished patients with elective gastrointestinal cancer surgery.