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Dietitian diet may ease constipation in Parkinson's patients

NCT ID NCT07213856

Symptom relief Sponsor: Hospital de Clinicas de Porto Alegre Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tests whether a personalized diet plan from a registered dietitian can improve constipation in people with Parkinson's disease. Fifty-four participants will follow the diet for 3 months, with regular check-ins. Researchers will measure bowel movements, gut bacteria, and diet quality to see if the intervention helps.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
dietitian-guided nutritional intervention (diet plan and counseling)
What this could lead to
If it works, this could offer a simple, drug-free way to manage constipation in Parkinson's disease, improving quality of life.
What could go wrong
This is a small, early-stage trial (54 people) with no blinding, so results may not be conclusive or widely applicable. Dietary changes can be hard to stick with long-term.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 54 people

The number the study aims to enrol. It can still change while the study runs.

Started

Apr 2026

Expected to finish

Aug 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults with a previous diagnosis of Parkinson's disease * On a stable dose of levodopa for at least 3 months * Diagnosis of Functional Constipation by the Rome IV protocol Exclusion Criteria: * Diagnosis of atypical or secondary parkinsonism * Hoehn and Yahr stage greater than 2 * Presence of severe neurological or psychiatric disorders that impair the ability to participate in study procedures * Previous diagnosis of dementia * Presence of comorbidities such as active cancer, chronic obstructive pulmonary disease (COPD), heart failure, and/or chronic kidney disease * History of gastrointestinal cancers, inflammatory bowel diseases, or surgeries involving the gastrointestinal tract * Constipation secondary to clinical conditions such as hypothyroidism or diabetes mellitus * Use of opioids * Use of probiotics or antibiotics in the past 8 weeks * Continuous use of laxatives in the past 8 weeks * Presence of severe dysphagia according to the Functional Oral Intake Scale (FOIS) * Individuals receiving enteral or parenteral nutrition * Individuals under nutritional follow-up in the past 3 months

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Conditions

The condition(s) this trial relates to.

constipation disorder Parkinson disease

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Constipation - functional Parkinsons disease (PD)

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Hospital de Clínicas de Porto Alegre (HCPA)

    RECRUITING

    Porto Alegre, Rio Grande do Sul, Brazil

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