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CompletedNCT04168073SALTYUpdated Dec 15, 2022

Sodium Diet Effect on Aldosterone and Urinary RNA (SALTY)

An interventional study of High-sodium diet 300 mmol sodium/day and Low-sodium diet 10 mmol sodium/day in Healthy, sponsored by University of Michigan. Completed at 1 site in United States. Open to participants aged 21 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-12-15.

Sponsored by University of Michigan · Not applicable, Interventional, and Basic science

Phase
Not applicable
Study type
Interventional
Enrollment
21
Allocation
Randomized
Ages
21 Years to 50 Years
Sex
All
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Study summary

This cross-over clinical trial is being conducted to evaluate the difference in urinary messenger RNA (mRNA) biomarkers of mineralocorticoid receptor activation following a low-sodium diet, as compared to a high-sodium diet. The study team will collect urine and blood samples from each participant to study mineralocorticoid receptor-regulated mRNA biomarkers following the consumption of each diet.

The study team will instruct the participants to consume 8 days each of high- (300 mmol/day) and low- (10 mmol/day) sodium meals. The order in which the participants will eat the two study diets will be randomly determined. In between the high- and low-sodium diets, the participants will have a wash-out period of 6 days, during which they will be encouraged to consume their usual diet. Participants will be asked to provide the study team with 24-hour urine samples, random urine samples, and blood samples throughout their participation in this clinical trial.

02

Conditions studied

  • Healthy

Keywords

  • low sodium diet
  • high sodium diet
  • biomarker
  • aldosterone
  • mineralocorticoid
  • mineralocorticoid receptor
03

In context

Lead sponsor

University of Michigan is the lead sponsor of 1,475 studies on the registry; 196 are open to participants now.

Of its 162 completed or terminated interventional studies of FDA-regulated products, 128 (79%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
21 Years to 50 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Normotensive, as defined by:

    • Systolic blood pressure (SBP) \< 140 mmHg and diastolic blood pressure (DBP) \< 90 mmHg
    • Never prescribed an antihypertensive medication
  • Willingness to refrain from intense exercise (for example, swimming, biking, running)

Exclusion criteria

Exclusion Criteria:

  • Hypertension (history of blood pressure ≥ 140/90 mmHg)
  • History of hypertensive urgency, hypertensive crisis, or hospitalizations for hypertension
  • History of chronic kidney disease
  • History of heart failure
  • Current food allergy
  • Pregnancy
  • Known hyperaldosteronism
  • Current mineralocorticoid antagonist use
  • Current treatment for diabetes mellitus
  • Known adrenal insufficiency
  • Current glucocorticoid use
  • Electrolyte abnormality on baseline laboratory assessment
  • Current potassium supplementation
  • Urinary tract infection (UTI)
  • Significant renal insufficiency or any other condition thought by the Principal Investigator to place the participant at increased risk of injury during the clinical trial or compromise the scientific integrity of the study
05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Randomized
Intervention model
Crossover assignment
Masking
None (open label)
Enrollment
21 participants (actual)

Study arms

  • Experimental
    High sodium diet

    Other: High-sodium diet 300 mmol sodium/day

  • Experimental
    Low sodium diet

    Other: Low-sodium diet 10 mmol sodium/day

Interventions

  • OtherHigh-sodium diet 300 mmol sodium/day

    Day 7 or day 21 high-sodium diet begins for 8 days. Day 15 wash-out begins for 6 days. Pre-made meals for both the high-and low-sodium diet will be provided to each participant by the study team.

  • OtherLow-sodium diet 10 mmol sodium/day

    Day 7 or day 21 low-sodium diet begins for 8 days. Day 15 wash-out begins for 6 days. Pre-made meals for both the high-and low-sodium diet will be provided to each participant by the study team.

06

What researchers measure

Primary outcomes

  1. Urinary mineralocorticoid receptor-regulated messenger RNA (mRNA) biomarker

    Urinary mRNA biomarkers following consumption of a high-sodium and low-sodium diet will be measured using real-time quantitative polymerase chain reaction (RT-qPCR).

    Time frame: Day 15 (after first diet period)

  2. Urinary mineralocorticoid receptor-regulated mRNA biomarker

    Urinary mRNA biomarkers following consumption of a high-sodium and low-sodium diet will be measured using real-time quantitative polymerase chain reaction (RT-qPCR).

    Time frame: Day 29 (after second diet period)

Secondary outcomes

  1. Blood pressure

    Systolic and diastolic blood pressure measurement following consumption of a high-sodium compared to a low-sodium diet

    Time frame: Day 15 (after first diet period)

  2. Blood pressure

    Systolic and diastolic blood pressure measurement following consumption of a high-sodium compared to a low-sodium diet

    Time frame: Day 29 (after second diet period)

07

Study locations

1 site
  • University of Michigan
    Ann Arbor, Michigan 48109, United States
08

References and documents

Study documents

  • Informed consent form · Nov 2, 2021

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: Yes — We will de-identify participant information and will share it with a trusted repository, such as National Institutes of Health (NIH) Figshare or The Inter-university Consortium for Political and Social Research (ICPSR). We will de-identify and share data obtained from analyzing urinary mRNA biomarkers and measuring the systolic and diastolic blood pressure following consumption of a high-sodium and low-sodium diet. Additionally, specific lab values that support the validity and quality of the study treatment will be shared in a trusted repository.

Supporting information: Study protocol, Icf

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 15, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04168073
Lead sponsor
University of Michigan
Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
Responsible party
J Brian Byrd, MD, MS (Assistant Professor of Internal Medicine, University of Michigan) — Principal investigator
First posted
Nov 19, 2019
Start date
Feb 12, 2020
Primary completion
Dec 8, 2021
Completion
Dec 8, 2021
Last update
Dec 15, 2022

Study contacts

J Brian Byrd, MD, MS
principal investigator · University of Michigan

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Dec 2022. You cannot join it, but the record below documents what was studied.

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