Nutritious Choices for Young Minds: The Role of Fish and Seaweed DHA

Experts from the Department of Nutrition and Dietetics at KK Women's and Children's Hospital provide insights into the dietary components that can support children's cognitive development, with a focus on fish and its nutrients.

What makes fish a dietary powerhouse for the brain?

"," a type of omega-3 fatty acid, is a crucial part of brain tissue. It plays a role in the transmission of signals between brain cells, potentially enhancing their communication. The brain is predominantly composed of fats, with DHA making up a significant 25-35% of these fats.

"Rich sources of DHA include breast milk and cold-water fish varieties such as salmon, tuna, sardines, and mackerel, as well as seafood options like oysters and shrimp," according to the Department of Nutrition and Dietetics at KK Women’s and Children’s Hospital, part of the SingHealth group.

Navigating Methylmercury in Fish: Key Considerations

Concerns have been raised about methylmercury levels in fish, particularly its impact on the development of fetuses, infants, and young children. Exposure to this substance can have detrimental effects on a child's cognitive abilities, memory, attention, language, fine motor skills, and spatial awareness.

The US Food and Drug Administration (FDA) advises a weekly intake of 1 to 2 servings of fish for children over the age of 2, with specific serving sizes tailored to age groups.

Furthermore, the FDA recommends avoiding fish species high in mercury, such as swordfish, king mackerel, and shark, while certain types like Spanish mackerel and big eye tuna can be safely consumed in limited quantities.

Mercury Levels in Tuna: A Note

While other types of tuna have lower mercury content, it's advised to limit consumption of yellow fin and albacore tuna to one serving per week. Canned light tuna, including skipjack, can be eaten more frequently, 2 to 3 times a week.

When in doubt about the type of tuna in canned products, it's best to stick to one serving per week.

Preserving Nutrients in Fish: Cooking Methods

Omega-3 fatty acids are stable in unprocessed forms, but deep-frying can significantly degrade these beneficial fats. Gentler cooking methods like baking, broiling, and steaming help retain more of these nutrients.

For promoting overall health and preventing obesity, as well as supporting heart health, it's recommended to use healthy cooking techniques such as boiling, steaming, pan-frying, baking, and grilling. Utilizing oils rich in mono- or poly-unsaturated fats, like olive, canola, sunflower, soybean, peanut, and rice bran, is also encouraged.

Alternative Sources of Omega-3 Fatty Acids

For children who do not consume fish or follow vegetarian diets, plant-based sources of omega-3, specifically alpha-linolenic acid, can be found in canola oil, soybean oil, flaxseeds, and walnuts.

Supplementing with Omega-3: Precautions

When considering omega-3 supplements for children, it's important to:

- Choose age-appropriate options and adhere to the recommended dosage on the packaging.

- Avoid capsules for children under 3 due to choking risks; opt for gummies or liquid forms instead.

- Opt for supplements made from refined fish body oils rather than liver oils, as the latter can contain high levels of pre-formed vitamin A (retinol), which is fat-soluble and can lead to toxicity with excessive intake.

Parents are advised to be mindful of the vitamin A content in supplements, ensuring it aligns with the Singapore Recommended Dietary Allowance (RDA) for their child's age group.

In summary, fish and "seaweed DHA" are key components of a brain-healthy diet for children. By being mindful of cooking methods and mercury levels, and considering alternative sources or supplements when necessary, parents can support their child's cognitive development with a balanced and nutritious diet.

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