An interventional study of Whole-Grain Brown Rice and Refined White Rice in Healthy Adult Males and Healthy Adult Females, sponsored by North Carolina Agriculture & Technical State University. Recruiting at 1 site in United States. Open to participants aged 25 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-27.
Sponsored by North Carolina Agriculture & Technical State University · Not applicable, Interventional, and Basic science
The purpose of this research study is to identify biomarkers (measurable signs).
in the body like substances in blood or urine) of whole-grain (WG) brown rice intake following an acute exposure in a pharmacokinetic (how the body absorbs, processes, and gets rid of a substance or ingredient) feeding study. In this aim, investigators will conduct a randomized crossover acute pharmacokinetic study of brown rice. Investigators will then use a targeted metabolomics approach to identify the exposure markers of brown rice intake, further develop analytical methods to study its pharmacokinetics, build an in-house WG metabolite database, and use an untargeted metabolomics approach to investigate postprandial biomarkers of brown rice intake. At the completion of this study, the expectation is that investigators will identify brown rice phytochemicals and its metabolites as objective biomarkers of total and individual WGs that are commonly consumed by Americans.
Days 0-7: Healthy volunteers were recruited and instructed to avoid consuming any whole-grain products beginning one week before the intervention and continuing throughout the study period.
Day 8 - Pharmacokinetic (PK) Visit 1: Participants consumed two servings of either whole-grain or refined-grain (46 g of raw grain per serving; 92 g total).Blood and urine samples were collected at multiple time points over 48 hours, and baseline fecal samples were collected the day before the intervention.
Day 15 - Pharmacokinetic (PK) Visit 2: After a 6-day washout period, participants crossed over to the alternate treatment. Blood and urine samples were again collected at multiple time points over 48 hours.
North Carolina Agriculture & Technical State University is the lead sponsor of 12 studies on the registry; 5 are open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants will complete a 7-day wash-in period during which they will avoid consuming whole-grain products. During Pharmacokinetic (PK) Visit 1 (Day 8), participants will consume whole-grain brown rice. After a 6-day washout period, participants will cross over and consume refined white rice during PK Visit 2 (Day 15). Blood and urine samples will be collected over 48 hours following each intervention.
Dietary Supplement: Whole-Grain Brown Rice · Dietary Supplement: Refined White Rice
Participants will complete a 7-day wash-in period during which they will avoid consuming whole-grain products. During Pharmacokinetic (PK) Visit 1 (Day 8), participants will consume refined white rice. After a 6-day washout period, participants will cross over and consume whole-grain brown rice during PK Visit 2 (Day 15). Blood and urine samples will be collected over 48 hours following each intervention.
Dietary Supplement: Whole-Grain Brown Rice · Dietary Supplement: Refined White Rice
Participants will consume two servings of cooked whole-grain brown rice (46 g raw grain per serving; 92 g total) during the pharmacokinetic study visit.
Participants will consume two servings of cooked refined white rice (46 g raw grain per serving; 92 g total) during the pharmacokinetic study visit.
Change From Baseline in Plasma and Urine Metabolite Concentration Following Whole-Grain Product Intake
Metabolite concentrations will be measured at baseline and at postprandial time points following consumption of the whole-grain products using untargeted and targeted metabolomics. Changes from baseline in metabolite concentrations will be reported to characterize the acute metabolic response to whole-grain products.
Time frame: Baseline through 48 hours after consumption of whole-grain product during pharmacokinetic study visit.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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North Carolina Agriculture & Technical State University