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Tomato Supplementation and Cardiovascular Health

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03209817
Recruitment Status : Completed
First Posted : July 6, 2017
Last Update Posted : April 6, 2018
Information provided by (Responsible Party):
Jose Lara Gallegos, Northumbria University

Brief Summary:

This clinical trial aims to test the effects of consuming two types of tomato (one ordinary cherry red tomato containing lycopene, and the other a yellow cherry tomato low in lycopene), on cardiovascular risk factors including endothelial function as the primary outcome, and blood lipids, inflammatory factors and blood pressure.

In a crossover design, participants of this study will randomly consume 300g of raw cherry (red and yellow) tomatoes per day for four weeks, with a control period consuming no tomato products. Before and after each intervention, the cardiovascular outcomes mentioned above will be measured in the clinic.

Condition or disease Intervention/treatment Phase
Healthy Dietary Supplement: Red cherry tomato Dietary Supplement: Yellow cherry tomato Not Applicable

Detailed Description:

This study will have a randomised and crossover design of 2 interventions supplementing 300g/day of two different varieties of tomato; each of these interventions will last for 4 weeks, with a control period (no tomato consumption) of 4 weeks between these. The total study period will be 12 weeks. The target sample size for this study is 30 male participants. This study visit involve 4 study visits over a 12-week period plus a screening visit before the intervention.

In this study, the interventions will require participants to consume two different varieties of fresh tomatoes in random order. Participants will be given all the tomato to be consumed during the study, and will be instructed not to consume additional tomato sources. The amount of tomato to be consumed will be delivered every week. Participants will consume the tomatoes anytime as snack or with meal. In order to control for other dietary factors, participants will also be asked to record food diary throughout the first study period (4 weeks) and will be recommended to repeat their own dietary pattern for the control period and second study period to match up the food and nutrition intake throughout the whole study. They should not alter their usual diet and exercise patterns when completing the food diary or study. Before and after each 4 weeks intervention or control period, participant will attend the study visit for measurements.

Baseline measurements will be taken at the start of the first study period. All measurements will be measured at fasted state on before and after 4-week study period. Anthropometric measurements including height and weight, a total of 72ml venous blood samples (18ml each measurement) will be collected by researcher. Spot urine and saliva samples will be collected into a flask provided by participants themselves. Plasma and urine analyses will not commence until the full intervention study is complete, and all samples from each subject are analysed within one batch to reduce inter-batch variation. Trained researchers will obtain blood sample in this study.

Before the start of the trial, 4 volunteers will be recruited to consume 1 week of 300g red cherry tomato per day for 7 days in order to establish expected serum levels of lycopene after tomato supplementation. The aim of this is to develop cut-off serum levels to establish compliance with interventions. Six ml of fasting blood will be taken at baseline and after the 1 week consumption of red cherry tomato.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 26 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Effects of Tomato Supplementation on Cardiovascular Health
Actual Study Start Date : January 23, 2017
Actual Primary Completion Date : February 28, 2018
Actual Study Completion Date : February 28, 2018

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Red cherry tomato
300 grams of red cherry tomatoes per day for four weeks (each)
Dietary Supplement: Red cherry tomato
300 grams of cherry tomatoes per day for four weeks (each)

Experimental: Yellow cherry tomato
300 grams of yellow cherry tomatoes per day for four weeks (each)
Dietary Supplement: Yellow cherry tomato
300 grams of cherry tomatoes per day for four weeks (each)

No Intervention: Control No tomato
No tomato products consumption

Primary Outcome Measures :
  1. Flow mediated dilation (FMD) [ Time Frame: at 4 weeks ]
    To assess macrovascular endothelial function.

  2. Laser doppler imaging (LDI) [ Time Frame: at 4 weeks ]
    To assess the microvascular endothelial function.

  3. Pulse wave velocity (PWV) and pulse wave analysis (PWA) [ Time Frame: at 4 weeks ]
    To assess arterial stiffness

Secondary Outcome Measures :
  1. Ambulatory blood pressure [ Time Frame: at 4 weeks ]
    24 hours blood pressure

  2. Blood lipids [ Time Frame: at 4 weeks ]
    Total, LDL, HDL cholesterol and triglycerides

  3. Interleukin-6 (IL-6) [ Time Frame: at 4 weeks ]
    Interleukin-6 (IL-6)

  4. C-reactive protein (CRP) [ Time Frame: at 4 weeks ]
    C-reactive protein (CRP)

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Male.
  • Aged between 18-60.
  • Healthy.
  • Non smoker.
  • Not taking antioxidant supplement.
  • No known allergy or intolerance to tomato.

Exclusion Criteria:

  • Female
  • Aged below 18 or above 60 years old.
  • Suffering and taking medications for hypertension (>140/90mmHg), diabetes, high blood cholesterol and heart problems (e.g. arrhythmia, high-grade stenosis of the carotid artery or carotid sinus syndrome).
  • Taking antioxidant supplements.
  • Smoking.
  • Allergy to tomato or tomato products.

Information from the National Library of Medicine

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 identifier (NCT number): NCT03209817

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United Kingdom
Department of Applied Sciences, Faculty of Health and Life Sciences, Northumbria University
Newcastle upon Tyne, United Kingdom, NE1 8ST
Sponsors and Collaborators
Northumbria University
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Principal Investigator: Jose Lara, PhD Northumbria University
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Responsible Party: Jose Lara Gallegos, Dr, Northumbria University Identifier: NCT03209817    
Other Study ID Numbers: HLS-JLG-03-07-17
First Posted: July 6, 2017    Key Record Dates
Last Update Posted: April 6, 2018
Last Verified: April 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No