Nitrate INFORMER Nitrosamine Study

Not Applicable

Completed

• Conditions: Health Risk Behaviors
• Interventions: Dietary Supplement: Meat with added nitrate; Dietary Supplement: Meat with added nitrate plus vegetables

• Registration Number: NCT05045807
• Lead Sponsor: Edith Cowan University

Brief Summary

Nitrate is a controversial component of vegetables, meat, and drinking water. The now well-established benefits of nitrate, through the enterosalivary nitrate-nitrite-nitric oxide (NO) pathway, on cardiovascular risk factors and long-term cardiovascular disease risk are tarnished by a continuing concern about a link between nitrate ingestion and cancer. This can result in misguided advice to avoid consumption of high-nitrate leafy green vegetables by both the media and the scientific literature. A recent media headline stated, "Cancer alert over rocket: trendy salad leaves exceed safe levels of carcinogenic nitrates in one in every ten samples". One scientific review stated, "the presence of nitrate in vegetables, as in water and generally in other foods, is a serious threat to man's health". Controversy in the literature, and gaps in the knowledge are leading to confusing messages around vegetables that may play a critical role in cardiovascular health.

The major dietary sources of nitrate are vegetables, meat, and drinking water. Source of nitrate could be a crucial factor determining whether the consumption of nitrate is linked with beneficial (such as improving cardiovascular health) versus harmful (N-nitrosamine formation) effects. For example, unlike meat and water-derived nitrate, vegetables contain high levels of vitamin C and/or polyphenols that may inhibit the production of N-nitrosamines. So far, no study has investigated the formation of N-nitrosamines after consumption of these different sources in humans.

A pilot study will be conducted to determine that endogenous N-nitrosamine formation is observed after ingestion of meat with added nitrate and nitrite and that consumption of vegetables with the meat containing added nitrate and nitrite will inhibit the production of N-nitrosamines.

Detailed Description

Study design:

A crossover study design will be used with a 1-week washout period. Each participant will complete the scheduled study visits for one of the dietary interventions which will be assigned in random order. Following the washout, the participants will then complete the scheduled study visits for the remaining intervention. Participants will be provided with a low nitrate and N-nitrosamine meal on the preceding evening of each study visit. These meals will be consistent across all study visits. Participants will be asked to refrain from drinking coffee and any alcoholic beverage and doing any exercise 24 hours prior to the study visit.

Dietary interventions:

Meat with added nitrate: Prosciutto/pancetta/Parma ham/salami (all derived from pork) prepared by a commercial butcher with sodium nitrate as an additive.

Meat with added nitrate plus vegetables: The same intervention described above consumed together with mixed vegetables.

Assessments:

At each clinic visit, baseline samples of urine will be collected for measurement of N-nitrosamines, nitrate, and nitrite. After the intervention, all urine within the first 240 minutes and then subsequent 20-hour period will be collected for measurement of N-nitrosamines, nitrate, and nitrite.

Study Timeline

• Study First Submitted: 2021-08-30
• Study First Submitted QC: 2021-09-15
• Study First Posted: 2021-09-16
• Study Start: 2021-10-11
• Primary Completion: 2021-12-31
• Study Completion: 2021-12-31
• Status Verified: 2022-03
• Last Update Submitted: 2022-03-30
• Last Update Posted: 2022-04-01

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 6

Inclusion Criteria

• Six healthy, ambulant, community-dwelling men and women aged between 18 to 55 years old and with no history of major chronic disease will be recruited from the Perth general population.

Exclusion Criteria

Individuals volunteering to participate in the study will be excluded according to the following criteria:

• current or recent (<12 months) smoking
• body mass index (BMI) <18 or > 35 kg/m2
• systolic blood pressure > 160 mmHg
• diastolic blood pressure > 100 mmHg
• any major illness such as cancer, psychiatric illness, diagnosed diabetes
• use of any of the following medications: statins, antihypertensives, nitric oxide donors, antithrombotic medication, anti-coagulant medication, anti-arrhythmic drugs, beta-blockers, regular aspirin use, regular proton pump inhibitor use
• alcohol consumption > 30g/day
• who are pregnant, lactating, or wishing to become pregnant during the study
• use of antibiotics within the previous 12 weeks of the study
• regular use of mouthwash and not willing to cease mouthwash use for the duration of the study
• participation on other research studies
• major gastrointestinal tract condition e.g. Crohns disease and inflammatory bowel disease
• and inability or unwillingness to follow the study protocol.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Meat with added nitrate	Meat with added nitrate	Prosciutto/pancetta/Parma ham/salami (all derived from pork) prepared by a commercial butcher with sodium nitrate as an additive.
Meat with added nitrate plus vegetables	Meat with added nitrate plus vegetables	The same intervention as of Arm "meat with added nitrate" consumed together with mixed vegetables.

Primary Outcome Measures

Name	Time	Method
N-nitrosamines in urine post each intervention after 4 hours up till 24 hours	After each clinic visit, all urine from 4-hour to 24-hour period will be collected.	Participants will be provided with a sterilized container and instructions to collect all urine from 4 hours until 24 hours post intervention. Urine aliquots will be frozen at -80°C until analysis. Level of N-nitrosamines will be measured by gas chromatography mass spectrometry (GCMS).
N-nitrosamines in urine post each intervention up to 240 min	At each clinic visit, all urine samples within the first 240 min will be collected.	Participants will be provided with a sterilized container and instructions to collect all urine until 4 hours post intervention. Urine aliquots will be frozen at -80°C until analysis. Level of N-nitrosamines will be measured by gas chromatography mass spectrometry (GCMS).
N-nitrosamines in urine pre each intervention	At each clinic visit, baseline samples of urine will be collected.	Participants will be provided with a sterilized container and instructions to collect the first urine sample of the day which will be brought into the clinic. Urine aliquots will be frozen at -80°C until analysis. Level of N-nitrosamines will be measured by gas chromatography mass spectrometry (GCMS).

Trial Locations

Locations (1)

Royal Perth Hospital Research Foundation; 🇦🇺 Perth, Western Australia, Australia