"Omega-3" is a friend to the heart... but does it confuse blood sugar?

Omega-3 supplements, also known as fish oil, contain a type of fat found in fatty fish and seafood such as salmon, mackerel, and tuna.

Scientific studies on the effect of taking omega-3 supplements daily on blood sugar levels show mixed results, generally indicating a limited or almost non-existent effect.

Undetermined effect on blood sugar

High blood sugar levels, resulting from a malfunction in insulin production or the body's response to it, are the main characteristic of diabetes, a chronic disease that, if left uncontrolled, can lead to serious complications affecting the eyes, kidneys, heart, and nervous system.

Given the seriousness and long-lasting nature of the disease, extensive research has been conducted to study the role of certain dietary supplements, including omega-3 fatty acids, both in preventing diabetes and as a complement to conventional drug therapy. However, the results of this research have remained inconsistent.

While some studies have indicated that omega-3 supplements may help lower blood sugar levels , other studies have found little to no effect.What do scientific studies say?

One study that highlighted this discrepancy was published in 2024 in the scientific journal Current Nutrition Reports and reviewed 30 randomized clinical trials involving adults with type 1 or type 2 diabetes or gestational diabetes .

Participants received omega-3 supplements in different doses and types for periods ranging from 6 weeks to 12 months.

The results showed a decrease in fasting blood sugar in some participants, while no change occurred in others.

The researchers attributed this discrepancy to several factors, including the number of participants, the duration of the study, the age of the patients, the duration of diabetes, and the supplement dosage.

Is it advisable to take omega-3 supplements?

There is insufficient evidence to support the use of omega-3 supplements for improving blood sugar control. Therefore, the American Diabetes Association does not generally recommend their use for people with diabetes or prediabetes.

However, some evidence suggests that omega-3 fatty acids may benefit heart health in people with diabetes , especially those with high cholesterol or other cardiovascular risk factors. Therefore, a doctor may recommend them based on individual circumstances.

Consulting a doctor is necessary

It is always advisable to consult a doctor before starting omega-3 supplements, as they may interact with certain medications such as blood thinners. Side effects are often mild and include:

Unpleasant taste.

Bad breath.

Digestive disturbances such as nausea, diarrhea, or heartburn.