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Treatment Overview

Essential fatty acids (EFAs) are compounds that cannot be made by the body but are required for many crucial biochemical processes. There are two groups of EFAs: omega-6 and omega-3. The relative levels of these two groups of EFAs are critical to the health and development of the brain and the body. If the level of omega-6 is much higher than the level of omega-3 in the diet, there can be negative effects on cognition, mood, and behaviour. The ideal ratio between these EFAs has been estimated at 2.3 omega-6 to 1 omega-3. Most North American diets provide too many omega-6 EFAs and not enough omega-3 EFAs, giving a ratio estimated at between 10-20 omega-6 to 1 omega-3.

Grains, processed foods, meat, milk, eggs, and corn oil all contain omega-6 EFAs. Eggs (especially omega-3 eggs), canola oil, and walnuts contain omega-3 EFAs. However, the best sources of omega-3 EFAs come from fatty fish such as cod, tuna, halibut, mackerel, herring, trout, sardines, and salmon.

Omega-3 EFAs can be added to a child’s diet with a fish oil supplement purchased over-the-counter or online at a grocery, drug, or health-food store. It can be taken one or more times every day. Children may find swallowing fish oil capsules difficult, but several flavored chewable or custard-like options are also available. Alternatively, adult-sized gel caps can be squeezed into a small child’s mouth or swallowed by an older child.

The recommended dosage of the omega-3 fatty acids EPA and DHA for all ages is at least 650 mg/day (total). Medical supervision is recommended for daily intakes above 3 grams. There has been no research on the optimal dose for children with autism and research on other disorders shows that the best dose of EFA depends on the disorder, but it seems to range from 1-2 grams per day. Research on using EFA supplementation to treat autism and related disorders have used doses of omega-3 EFAs at 540-2320 mg per day (0.5-2.3 grams/day). If you choose omega-3 EFAs as an alternative therapy, ask your child’s pediatrician what dose is appropriate for your child.

The best source of omega-3 oils for vegan and vegetarian families is flaxseed oils and several types of algae, but the EFAs from these sources are not as useful for the body as those in fish oils.

There are currently only a few studies of the effectiveness of EFA supplementation as a treatment for autism, and none of these have been well controlled. For example, most of the parents of eighteen children with autism who had been supplemented with fish oil (Eye-Q at 4-8 capsules/day giving 0.6-1.2 grams/day of EPA and DHA, or Kirunal at 5-10 capsules/day giving 1.2-2.3 grams/day of EPA and DHA) for six months described improvements in overall health, cognition, sleep patterns, social interactions and eye contact. Unfortunately, this was not a double-blind study, meaning it is possible that this is just a placebo effect. In another case report, a child diagnosed with autism who had been given 540 mg of the omega-3 fatty acid EPA per day over a four week period experienced a complete elimination of his previous anxiety about everyday events as reported by his parents and clinician. They also described an improvement in his overall quality of life.

In a double-blind, controlled study, 117 children with dyspraxia, a motor disorder frequently associated with cognitive, behavioural and social challenges, received fish and evening primrose oil (a source of omega-6 fatty acids) during treatment. Significant improvements in reading, spelling, and behaviour were reported during the treatment period, and these improvements continued as long as the treatment was underway.

Studies of EFA supplementation at doses between 540-2320 mg per day (0.5 – 2.3 grams per day) have not reported any significant side effects. As long as EFAs are less than 10% of the total dietary intake, they are considered safe. However, several scientists have noted that fish oil supplements can contain contaminants such as mercury, hormones, dioxins, and PCBs. Thus, when purchasing fish oil supplements, you should purchase those that are purified by molecular distillation and are described as pharmaceutical grade.


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By Lara Pullen, PhD. The information from this page was reprinted with permission from Healing Thresholds. “Copyright (c) 2007, Healing Thresholds, Inc. All rights reserved”


Autism Canada does not endorse treatments, interventions and therapies but lists them so people can make informed choice.  This site is for information purposes only and is a starting point for readers to look into options that may fit or resonate.  Remember, therapies for autism, like any condition, should be discussed with a trusted medical practitioner or certified therapist before use.

All information, data and material contained, presented or provided here is for general information purposes only and is not to be construed as reflecting the knowledge or opinions of Autism Canada, or as providing legal or medical advice. All treatment decisions should be made by the individual in consultation with a licensed health care provider.

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