Effects of Brassica on Human Gut Lactobacilli (EBL)
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|ClinicalTrials.gov Identifier: NCT02291328|
Recruitment Status : Completed
First Posted : November 14, 2014
Last Update Posted : May 4, 2015
|Condition or disease||Intervention/treatment|
|Human Gut Microbiota||Other: High Brassica Other: Low Brassica|
The study is a randomised human dietary intervention two-phase cross-over study and will require the participants to consume both a low and a high Brassica vegetable diet. In this study, male and female participants aged between 18 and 50 years will be recruited until 10 complete the study. For the low Brassica diet test phase, the participants will be provided with one 84g portion of frozen broccoli and one 84g portion of frozen cauliflower, to be consumed across a period of two weeks. The participants will be asked to consume one of these portions of Brassica (either broccoli or cauliflower) in week one, and then consume the remaining portion of Brassica in week two, with a minimum of 5 days between consuming the two portions. When on the high Brassica diet test phase, the participants will be provided with six 84g portions of frozen broccoli, six 84g portions of frozen cauliflower, and six 300g portions of frozen broccoli and sweet potato soups (each with a broccoli content of 84g), to be consumed across a period of two weeks. The participants will be asked to consume three portions of broccoli, three portions of cauliflower, and three portions of the broccoli and sweet potato soups each week for two weeks, consuming a minimum of one portion per day. The Brassica diet test phases will be separated by a washout period, which will be a minimum of 2 weeks.
The participants will be asked to restrict their diet of Brassica vegetables and ITC-containing foods for a period which includes 2 weeks prior to test phases 1 and 2, as well as during the full 2 weeks of each test phase. The participants will be asked to provide faecal samples, urine samples, complete food diaries and stool charts at various stages throughout the intervention. Participants will be asked to complete a food diary, recording the consumption of all fruits and vegetables, for a consecutive seven day period, during each of the two test phases (test phases 1 and 2), and for the entire seven days of the last week of the study when consuming their habitual diet. Participants will also need to be willing to complete stool charts noting the frequency and consistency of their bowel movements.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||10 participants|
|Intervention Model:||Crossover Assignment|
|Masking:||None (Open Label)|
|Primary Purpose:||Basic Science|
|Official Title:||A Human Intervention Trial Investigating the Effects of Brassica on Gut Lactobacilli|
|Study Start Date :||September 2014|
|Primary Completion Date :||April 2015|
|Study Completion Date :||April 2015|
Experimental: High Brassica
Participants will be asked to consume 3x 84g portions of frozen broccoli, 3x 84g portions of frozen cauliflower, and 3x 300g portions of frozen broccoli and sweet potato soups a week for a total of 2 weeks.
Other: High Brassica
Participants consume a minimum of one portion of a Brassica food (84g frozen broccoli, 84g frozen cauliflower, or 300g frozen broccoli and sweet potato soup) each day for 14 consecutive days at their homes.
Experimental: Low Brassica
Participants will be asked to consume 1x 84g portion of either frozen broccoli or frozen cauliflower in week one, and the remaining 84g portion of Brassica in week two.
Other: Low Brassica
Participants consume one portion of a Brassica vegetable (84g frozen broccoli, or 84g frozen cauliflower) each week for two weeks at their homes.
- Lactobacilli in human faecal microbiota [ Time Frame: Two weeks ]To investigate whether eating a diet rich in Brassica vegetables for two weeks will cause an increase in human gut lactobacilli, compared to the number of lactobacilli present in the participants' normal gut microbiota.
- Human faecal microbial community composition [ Time Frame: Two weeks ]To ascertain whether eating a diet rich in Brassica vegetables modulates the gut microbial community as a whole, as compared to the consumption of a low Brassica diet, and the participants' normal gut microbiota.
- Human faecal bile acid profile [ Time Frame: Two weeks ]To determine whether the consumption of a high and/or low Brassica vegetable diet causes a change in short chain fatty acids and bile acids in the faeces.
- Faecal bacterial gene expression [ Time Frame: Two weeks ]To determine whether the consumption of a high and/or low Brassica vegetable diet causes a change in bacterial gene expression in the faeces.
- Urinary isothiocyanates (ITCs) excretion [ Time Frame: Two weeks ]To determine the extent of glucosinolate conversion to ITCs from Brassica vegetables, as measured by ITC excretion in the urine.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02291328
|Institute of Food Research|
|Norwich, Norfolk, United Kingdom, NR4 7UA|
|Principal Investigator:||Richard Mithen, PhD||Quadram Institute|