When children are facing exams or heavy workloads at school, many parents start looking at different ways to support their learning. One area that often comes up — sometimes with more questions than answers — is nutrition.

We know that certain foods can help to improve study performance, because they support brain development or improve memory and focus. But with picky eating habits, busy schedules, and the flood of online health claims, it can be hard to determine what’s truly helpful. Do children really need fish oil? Are eggs okay? Is frozen broccoli worth bothering with?

Below are the questions that parents in our community have asked about "brain foods" — and what the science actually says.

Should I give my child fish oil, or is canned salmon enough?

Fatty fish like salmon and sardines are among the best food sources of DHA, an omega-3 fatty acid that plays a key role in brain development, attention, and learning.

If your child eats oily fish once or twice a week — whether grilled, in sandwiches, or from a can — they’re likely getting a reasonable amount of DHA through food. But if they refuse fish, have allergies, or follow a vegetarian diet, a fish oil supplement may help fill the gap.

That said, the research on omega-3 supplements and cognitive performance in healthy children is mixed. Some studies have shown small improvements in memory and learning, particularly for children with low literacy levels or poor diets. However, other studies have shown no difference in school performance.

For children diagnosed with ADHD, the evidence is a bit stronger. Omega-3 supplements, especially when taken alongside prescribed stimulant medication, may help reduce ADHD symptoms and improve school performance.

More recent findings also suggest that higher DHA intake doesn’t always mean higher DHA levels in the blood, due to differences in individual metabolism. This makes it difficult to predict exactly how much benefit consumption brings.

Verdict: If your child doesn’t eat oily fish regularly, a daily supplement can be a practical way to support their omega-3 intake, especially if they have ADHD or other concerns related to attention and focus. But if they’re already eating fish weekly and have no specific concerns, they may not need it. Speak with your child’s healthcare provider before starting supplements to make sure it’s safe and worthwhile.

Are walnuts really that special for the brain?

Walnuts often get grouped into the general category of “healthy snacks,” but they’re actually one of the most studied nuts when it comes to brain health.

What makes walnuts unique is their high content of alpha-linolenic acid (ALA), a plant-based omega-3 fatty acid. They’re also rich in vitamin E, polyphenols, and antioxidants, all of which support memory, mood regulation, and learning. Several studies — including those involving adolescents — have shown that regular walnut intake may enhance cognitive performance.

Adding walnuts to the diet is easy: they can be crushed into porridge, added to baked goods, or paired with fruit for a quick study snack. A small handful (three to five whole walnuts) a few times a week is enough to offer benefits.

Verdict: Yes, walnuts are worth consuming regularly. They might be particularly useful during high-focus periods like exams.

Are frozen vegetables, like broccoli, just as good as fresh?

Yes. In many cases, frozen vegetables are just as nutritious as fresh ones, sometimes even more so.

That’s because frozen produce is typically picked at peak ripeness and flash-frozen quickly, which helps preserve its nutrient content. For parents managing tight schedules or food waste, frozen vegetables are a practical, low-prep option that stores well and cooks fast.

Wondering what frozen veggies to stock up on? Broccoli stands out for its brain benefits. It contains sulforaphane, a compound studied for its potential to protect brain cells from oxidative stress and support detoxification. It’s also high in folate and vitamin K, which play roles in cognitive development.

Try adding it to fried rice, blending it into soup, or serving it with cheese sauce for a more child-friendly spin.

Verdict: Don’t worry about fresh vs. frozen. Just do what you need to get veggies like broccoli onto your child’s plate.

Should I worry about giving my child eggs because of cholesterol?

Eggs are one of the best sources of choline, a nutrient essential for memory, learning, and brain cell communication.

While eggs do contain dietary cholesterol, current research shows that for most healthy individuals, eggs don’t negatively impact cholesterol levels or heart health when eaten in moderation. In fact, one egg a day is considered safe.

Verdict: Eggs are brain-friendly and fine for most kids to eat regularly.

Do berries actually improve memory, or is that just a health fad?

Berries, especially blueberries, are one of the most well-studied fruits when it comes to brain health. They’re rich in anthocyanins, natural compounds that give them their deep colour and have been shown to improve blood flow to the brain, support signalling between brain cells, and protect against oxidative stress.

Several clinical studies involving school-age children have found that regular blueberry consumption may improve memory, attention span, and even reading accuracy.

Fresh, frozen, or even blended into smoothies, blueberries are easy to include in breakfast or snack routines. Other berries like strawberries and blackberries are also beneficial, but blueberries have the strongest research backing.

Verdict: Yes, berries have real cognitive benefits. Keep a bag of frozen berries in the freezer and add a handful to cereal, yoghurt, or smoothies whenever you can.

Are “brain foods” better than a vitamin supplement?

Whole foods and supplements serve different roles. Brain foods like salmon, broccoli, berries, and nuts provide a complex mix of nutrients, fibre, antioxidants, and other compounds that work together in ways we’re still learning about. Multivitamins, on the other hand, can help fill specific nutrient gaps, especially in picky eaters or if your family has restrictive diets.

Ideally, your child would get most of their nutrients from food, but that’s not always realistic. If your child is going through a picky phase, has food intolerances, or just isn’t eating much during stressful times, a basic multivitamin can offer peace of mind.

However, supplements should never be a full replacement. They don’t replicate the variety and “real world” absorption of nutrients from whole foods.

Verdict: Aim for healthy food first, but if needed, use age-appropriate supplements as a safety net.

Want to chat with other parents about brain foods? Join the conversation on the KiasuParents forum!