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Can a simple fish help tame type 2 diabetes?

NCT ID NCT02840630

Disease control Sponsor: University of Aberdeen Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 31, 2026 · Last updated Sep 01, 2026 · Updated 1 time

Summary

This trial asks whether eating tinned mackerel twice a week can improve blood sugar control in South Asian adults with type 2 diabetes. Participants with diabetes will either keep their usual diet or replace some red meat or poultry with mackerel for 16 weeks. Researchers will measure changes in blood sugar, omega-3 levels, triglycerides, and vitamin D. The study also includes a non-diabetic group for comparison, to explore how omega-3 status relates to blood sugar control in this population.

What this could mean

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

Active substance
Tinned mackerel (fish rich in omega-3 fatty acids)
What this could lead to
If eating mackerel improves blood sugar control, it could offer a simple dietary way to help manage type 2 diabetes in South Asian populations.
What could go wrong
This is a small, early-stage trial with only 20 diabetic participants, so results may not apply broadly. Eating more fish may not change blood sugar, and the study does not test long-term effects.

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

20 people

The number who actually took part.

Started

Oct 2016

Finished

Jan 2019

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

25 to 65 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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.

Non-diabetic group: Inclusion Criteria * Of South Asian origin (defined by country of birth, last name and self-report ethnicity) * Men and women between the age of 25 and 65; * Body mass index (BMI) of ≥23 kg/m2 according to WHO classification for Asian population; * Ability to speak, read and understand the English language. Exclusion criteria * Use of tobacco; * Use of insulin or oral hypoglycaemic agents; * Use of medications that are known to affect lipid metabolism, * Haemophiliacs, * Use of medications that are known to generally alter the haemostatic system; * Diagnosis of diabetes; * Diagnosis of hypertension, renal, hepatic, haematological disease or coronary heart disease; * Have previously donated blood for transfusion purposes within the last month; * Inability to understand participant information sheet. Diabetic control intervention and diabetic fish intervention group: Inclusion Criteria * Of South Asian origin (defined by country of birth, last name and self-report ethnicity) * Men and women between the age of 25 and 65; * Body mass index (BMI) of ≥23 kg/m2 according to WHO classification for Asian population; * Diagnosed with diabetes only controlled by diet and lifestyle; * Ability to speak, read and understand the English language. Exclusion criteria * Use of tobacco; * Use of insulin or oral hypoglycemic agents; * Use of medications that are known to affect lipid metabolism; * Haemophiliacs; * Use of medications that are known to generally alter the hemostatic system; * Diagnosis of hypertension, renal, hepatic, haematological disease or coronary heart disease; * Have previously donated blood for transfusion purposes within the last month; * Inability to understand participant information sheet.

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Conditions

The condition(s) this trial relates to.

type 2 diabetes mellitus

As listed by the trial registrant

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

Diabetes mellitus, type 2

Contacts and locations

Locations

  • University of Aberdeen Rowett Institute of Nutrition and Health

    Aberdeen, AB21 9SB, United Kingdom

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