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This study is designed to see if drinking a tomato-based vegetable juice will increase skin carotenoids.
The US Dietary Guidelines for Americans recommends that individuals consume approximately 2-4 c of vegetables each day to reduce risk of chronic disease, but current methods for assessing intake are either inaccurate (self-report) or invasive (blood carotenoid levels). Recent research indicates that skin carotenoid status may be a useful biomarker of vegetable intake, but the sensitivity to dose in unknown. In this study, we propose to test the dose-response of skin carotenoids to consumption of 3 different levels of vegetable juice (with a control group receiving water). We will test skin carotenoids in two ways: using resonance Raman spectroscopy (RRS), which we have previously validated, and with a new technique, pressure mediated reflection spectroscopy (RS; the "Veggie Meter"). We will compare the two techniques during an 8-week provided tomato-based juice intervention. Skin carotenoid readings will be compared to blood carotenoid concentrations and single nucleotide polymorphisms (SNPs) of genes related to the uptake, transport, and metabolism of carotenoids will be examined in blood and saliva.
High dose vegetable juice, Medium dose vegetable juice, Low dose vegetable juice, Control bottled water
USDA Grand Forks Human Nutrition Research Center
USDA Grand Forks Human Nutrition Research Center
Published on BioPortfolio: 2017-06-29T05:53:21-0400
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