DHA for kids: signs of low intake and causes

“Could my child be missing something?” Many parents ask themselves this question—especially when it concerns the brain and healthy development. One term keeps coming up: DHA deficiency. DHA belongs to the omega fatty acids, more specifically the omega-3 fatty acids. And many half-truths circulate about omega-3 deficiency.

In this article, we take an objective look at the topic—without scaremongering or empty promises. We explain what “DHA deficiency” means scientifically, why it is closely linked to omega-3 intake, and how status can be reliably determined.

The essentials at a glance

• DHA (docosahexaenoic acid) is the long-chain omega-3 fatty acid found in the highest proportion in nerve cell membranes. At its core, “DHA deficiency” is a matter of omega-3 status.

• There is no clearly defined “DHA deficiency syndrome” with a fixed list of symptoms. From a scientific perspective, it is more useful to look at inadequate intake in relation to recommended intake levels.

• The Swiss Society of Paediatrics considers omega-3 fatty acids to be among the “potentially critical nutrients in childhood.”⁸

• On average, children aged 4 to 10 consume only around 0.1 g of EPA/DHA per day.⁴

• Status is measured through a fatty acid analysis by a doctor or in a laboratory—not through a symptom-based self-test.

• EFSA-approved: DHA contributes to the maintenance of normal brain function and normal vision (with 250 mg of DHA per day).¹

All topics at a glance

What is DHA, and what role does it play for children?

DHA stands for docosahexaenoic acid. Together with EPA (eicosapentaenoic acid), it belongs to the long-chain omega-3 fatty acids—polyunsaturated compounds that the body can produce only to a limited extent. That is why they must be obtained through the diet.

DHA is particularly abundant in the nervous system. It is a structural component of nerve cell membranes. The brain consists largely of fat, so an adequate intake plays an important nutritional role.

DHA contributes to the maintenance of normal brain function and normal vision. According to the European Food Safety Authority (EFSA), the beneficial effect is achieved with a daily intake of 250 mg of DHA.¹ EPA and DHA together also contribute to normal heart function (with 250 mg of EPA + DHA daily).²

250 mg of DHA per day: At this amount, DHA contributes to the maintenance of normal brain function and vision, according to EFSA. (EFSA / Regulation (EU) No. 432/2012)

Because DHA is an “omega-3 topic,” we always consider a possible deficiency in the context of overall omega-3 intake. We explore the fundamentals in greater depth in our article: Why omega-3 fatty acids are so important for children.

Is there even such a thing as a “DHA deficiency” in children?

For nutrients such as iron or vitamin D, clearly defined deficiency states with established blood thresholds exist. DHA is different. There is simply no officially defined “deficiency syndrome.”

When people talk about a “DHA deficiency” or omega-3 deficiency in general, they are technically referring more precisely to intake below the recommended levels. And this is widespread in Germany.

Children aged 4 to 10 consume only around 0.1 g of EPA and DHA per day on average.⁴

The main reason: Fatty sea fish, the most important natural source of DHA, rarely ends up on many children’s plates.⁶ The Swiss Society of Paediatrics therefore lists omega-3 fatty acids among the “potentially critical nutrients in childhood.”⁸

≈ 0.1 g average daily intake of EPA and DHA among children aged 4 to 10 in Germany. (DGE Nutrition Report)

The key is putting things into perspective. Intake below reference values is not a disease. It is an indication that it is worth taking a closer look at the diet.

Omega-3, concentration, and ADHD: What the evidence says—and what it doesn’t

During their research, many parents come across omega-3 in connection with attention, concentration problems, restlessness, impulsivity, learning difficulties, mood swings, memory, or attention-deficit/hyperactivity disorder (learn more about ADHD in children.) This is a major concern for many families, especially when it comes to learning and school. Numerous studies have been conducted on this topic. However, the evidence is inconsistent and does not allow for blanket statements.

That’s why we deliberately remain cautious. A dietary supplement replaces neither a diagnosis nor treatment. Outside a genuine deficiency, a general improvement in school performance or concentration cannot be expected.⁸

The only scientifically established fact so far is that DHA contributes to the maintenance of normal brain function and normal vision.¹ Anyone interested in the evidence surrounding ADHD can find the details in our article: What role do vitamins, minerals, and omega-3 fatty acids play in ADHD?

Persistent abnormalities in attention or behavior should be medically evaluated—not self-treated with a single nutrient.

What symptoms do children show when they have an omega-3 deficiency?

Many parents wonder whether an inadequate omega-3 supply can be identified by specific symptoms in their child. The short answer is: An omega-3 or DHA deficiency cannot be identified using a fixed list of symptoms. Possible abnormalities are nonspecific and may have numerous other causes.

Two other indicators are more reliable than looking for “symptoms”:

• Diet: Does your child rarely or never eat fatty sea fish? Do they follow a vegan diet? Then an inadequate supply is more likely.

• Measurable status: Only a laboratory analysis can provide reliable information (more on this shortly).

Have you noticed a persistent, unusual change? Have it medically evaluated instead of hastily attributing it to a single nutrient.

Causes & risk groups: When children get too little DHA

Whether a child gets enough DHA depends almost entirely on their diet. These factors increase the likelihood of an inadequate supply:

• Little or no fish: Fatty sea fish—preferably wild-caught—is the richest natural source of DHA. Salmon and mackerel provide particularly high amounts. If fish is eaten rarely, intake decreases noticeably.

• Picky eaters: Children who like only a small selection of foods often fail to reach the recommended amounts—not only for DHA.

• Vegetarian or vegan diet: Plant-based sources such as flaxseeds, flaxseed oil, rapeseed oil, walnuts, and soy products provide ALA (alpha-linolenic acid). The body does produce EPA and DHA from it, but only in very small amounts.⁷
  Readily usable DHA is found primarily in microalgae and omega-3 algae oil. Vegetarians and vegans should therefore have their omega-3 intake checked regularly.⁸
  Find out more in our articles on vegan and vegetarian nutrition for children and omega-3 algae oil for children.

• High omega-6: A diet rich in omega-6 from certain vegetable oils can further inhibit the conversion of the plant-based omega-3 precursor.

It is worth looking beyond DHA. People who eat little fish or have a very one-sided diet are often also lacking other nutrients—important for health and the immune system. The EsKiMo II nutrition study (the KiGGS module of the Robert Koch Institute) shows that many children and adolescents in Germany do not reach the reference values for several vitamins and trace elements. Iron is one of them.⁶ A low magnesium status (magnesium deficiency in children) is also a recurring issue. An insufficient intake therefore rarely occurs in isolation.

“Testing” DHA status: How it can be determined

There is often confusion surrounding the “DHA deficiency child test.” It can refer to two completely different things:

• A product test—the comparison of different omega-3 products. We explain what matters in Omega-3 for children tested.

• A diagnostic test—the determination of the actual omega-3 status in the body.

For questions about an insufficiency, the diagnostic test is relevant. It is performed using a fatty acid analysis, often referred to as omega-3 index referred to.

Here, too, we want to be honest: There is no generally established standard target value for children as there is for adults. The interpretation of a result therefore belongs in expert hands. A “self-test based on symptoms,” on the other hand, is not meaningful.

Diet, oil & more: How DHA gets onto the table

Diet remains the most effective lever. And the good news is that children should ideally get omega-3 fatty acids from food. The German Nutrition Society (DGE) recommends one to two portions of fish per week, including fatty sea fish such as salmon or herring. Depending on the type of fish, this can already provide around 250 mg of EPA and DHA per day.⁵ The recommendation to regularly serve fish also applies to children—just in smaller portions.

Does your child dislike fish? Or do they follow a vegan diet? Then algae oil is a plant-based source that, unlike flaxseed oil, provides DHA and EPA directly. If the diet demonstrably does not provide enough, an omega-3 supplement may be useful. Omega-3 products are available as fish oil or algae oil capsules, liquid oil, chewable tablets, or Omega-3 gummies. For example, they are available in lemon or orange flavor, making them easier for children to take. When it comes to omega-3 dosage, the actual amount of EPA and DHA always matters—not the total amount of oil.

Expert tip: Two things are important to us here. Highly dosed supplements are not advisable, and children should consult a doctor before taking them.⁸ Food supplements do not replace a balanced diet.

You can find suitable products in our ranges for vitamins for children and vitamins for teenagers.

Frequently asked questions about DHA deficiency in children

What effects does DHA deficiency have on children?

There is no clearly defined DHA deficiency syndrome with clear consequences. From a professional perspective, the issue is inadequate intake compared with intake recommendations. DHA is a structural component of nerve cells and contributes to the maintenance of normal brain function and normal vision.¹ Adequate intake is therefore a sensible nutritional goal. However, broad health consequences cannot be inferred from inadequate intake alone.

What symptoms may indicate an omega-3 or DHA deficiency in children?

An omega-3 or DHA deficiency cannot be clearly identified in children based on specific symptoms. Possible signs are nonspecific and may have many other causes. If a deficiency is suspected, nutritional status should be assessed by a qualified professional.

How is DHA deficiency tested in children?

Through a blood fatty acid analysis, often called an “omega-3 index.” It measures the proportion of EPA and DHA in red blood cells. There is no generally established target value for children. The result should therefore be assessed by a qualified professional.

How much DHA do children need?

As a guideline, the positive effect referred to in the approved DHA health claims occurs with 250 mg of DHA per day.¹ For brain development, EFSA also specifies 250 mg of DHA per day for children aged 2 to 18, and 100 mg for toddlers under 24 months.³ This is readily achievable through one or two fish meals per week.⁵

Is plant-based omega-3 from flaxseeds or flaxseed oil enough to provide DHA?

Only to a limited extent. Flaxseeds, flaxseed oil, and rapeseed oil provide ALA, which the body first has to convert into EPA and DHA—and only to a small extent.⁷ Those who avoid fish can get DHA more reliably from algae oil or a corresponding supplement.

Should children get DHA from capsules or food?

The general rule is: food first. Capsules, chewable tablets, or gummies are an option when the diet is insufficient—for example, when avoiding fish or following a vegan diet. However, they do not replace a balanced diet. In children, the need should also be medically assessed in advance.

Professional note: This article is for general information only and is not a substitute for medical or nutritional advice. Food supplements are not a substitute for a balanced and varied diet. If you have questions about your child’s nutritional intake, please consult a pediatrician or a naturopath you trust.

Sources

1. EFSA NDA Panel: Scientific Opinion on the substantiation of health claims related to DHA – maintenance of normal brain function & normal vision (Art. 13, Regulation (EC) No. 1924/2006; authorized under Regulation (EU) No. 432/2012). EFSA Journal 2010;8(10):1734 & 2011;9(4):2078. Condition: 250 mg DHA/day. efsa.onlinelibrary.wiley.com/doi/pdf/10.2903/j.efsa.2010.1734

2. EFSA / EU Register of authorized health claims: “EPA and DHA contribute to the normal function of the heart” (condition: 250 mg EPA + DHA/day). Regulation (EU) No. 432/2012. efsa.onlinelibrary.wiley.com/doi/pdf/10.2903/j.efsa.2011.2078

3. EFSA NDA Panel: Scientific Opinion on the substantiation of a health claim related to DHA and contribution to normal brain development (Art. 14). EFSA Journal 2014;12(10):3840. Reference amounts: 250 mg DHA/day for children aged 2–18 years, 100 mg DHA/day for children under 24 months. EFSA assessment (PDF)

4. DGE nutrition report on average EPA/DHA intake in Germany (children aged 4–10: approx. 0.1 g/day), cited from Lebensmittelverband Deutschland: “Omega-3 fatty acid supplements.” lebensmittelverband.de

5. German Nutrition Society (DGE): Recommendation “Fish every week” – one to two portions of fish per week, including oily sea fish; 250 mg EPA + DHA per day. dge.de/…/fisch

6. Robert Koch Institute (RKI): EsKiMo II – Nutrition Study as a KiGGS Module (2020/2021). Nutrient intake of children and adolescents in Germany. edoc.rki.de/handle/176904/6887.2

7. Regarding the limited conversion of ALA into EPA/DHA: DGE / Lebensmittelverband Deutschland and EFSA. The body’s conversion of plant-based alpha-linolenic acid into the long-chain omega-3 fatty acids EPA and DHA occurs only to a limited extent. lebensmittelverband.de

8. Swiss Society of Paediatrics (pädiatrie schweiz): Omega-3 fatty acids as a “potentially critical nutrient in childhood”; guidance on vegetarian and vegan diets. paediatrieschweiz.ch (Classification, among others, cited from familienleben.ch)