Calm Your Anxious Child With the Right Nutrition

If your child wakes up worrying about school, they melt down over the smallest changes to their routine, or they lie awake at night with a busy brain, then the food on their plate is one of the most powerful tools you have to help them feel calmer.

After 30 years in clinical practice, I keep seeing the same pattern that when a child’s key nutrients are running low, their nervous system simply cannot hold itself steady enough, and that is where the panic and the crushing anxiety kicks in. The good news is that the right nutrition and daily habits can change their picture quickly, and you start to see a calmer more confident kid.

Anxiety in children has been climbing steadily in recent years, especially since the Covid pandemic, and most parents I meet have tried everything they can think of, including art, play and music therapies, mindfulness apps, calming bedtime routines and limiting screen time. These can all really help, but if the biological building blocks for a calm brain are missing, then none of them will do a good enough job for your child.

This blog walks you through the nutrients I look at first when a child is presenting with anxiety and rumination, and the everyday habits that help to reduce the rawness of anxiety. This is the first of three articles, and in the next one, I focus on the gut–brain link and finally I look at more complex immune and metabolic drivers of anxiety.

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What anxiety looks like in a child

Many anxious children never say the word ‘worry’. What you see instead is the body talking through physical symptoms, such as them complaining of tummy aches and headaches before school, broken sleep and nightmares, irritability that feels out of proportion, refusal to try new things, clinginess at the school drop-off, endless reassurance-seeking, or the kind of school refusal that builds slowly until one morning the wheels come off.

Underneath all of that is a nervous system that is stuck on high alert, and the brain is reading ordinary situations as threats. The body then starts responding with a cortisol and adrenaline surge that the child cannot switch off, and this sends their anxiety sky high.

Nutrition will not replace a good therapist or a kind teacher, but it does give the brain the raw materials to come back down to baseline more easily. You will learn in this blog that this can be done one mouthful at a time.

Why nutrition is so important for an anxious brain

Every neurotransmitter that shapes how calm, confident or fearful your child feels is built from the food that they eat.

Serotonin (the “feel-good” brain chemical) is largely made in the gut from the amino acid tryptophan (think turkey, chicken, avocado, bananas and cashew nuts). And then having enough vitamin B6, iron, and zinc (tryptophan’s buddies) is vital for making serotonin.

GABA, the neurotransmitter that quietens an overactive brain and tells your child that they are safe. Calming GABA depends on an essential trio of nutrients, which are magnesium, vitamin B6 and zinc to work properly. GABA-rich foods include wholegrains, broccoli, cauliflower, kidney beans, chestnuts, Swiss cheese, yoghurt and kefir, as well as fermented foods.

Dopamine keeps a child’s motivation and focus steady. It needs iron and the amino acid tyrosine, which comes from protein-rich foods. This is why red meat, eggs and fish are such key foods for child development as they contain both iron and tyrosine.

When any of these neurotransmitters are flagging and running low, the system that should bring your child back to feeling calm after a big wobble – simply cannot do its job. Topping up the right nutrients is often the difference between a child who recovers from a stressful day and one who spirals into a sea of anxiety.

Magnesium, the calming mineral

Magnesium is the one nutrient I reach for first when there is anxiety in the picture. It regulates a child’s stress response, supports sleep, relaxes muscles and nerves and helps to balance blood sugar.

Stress itself burns through magnesium, so anxious children are very often running low in this mighty mineral that is so essential to a well-regulated nervous system. If they eat lots of sugary foods or refined carbs and sweat at night or from exercise, they may be falling short of magnesium.

Food sources of magnesium include pumpkin seeds, almonds, cashews, dark green leafy vegetables, buckwheat, beans, oats and good-quality dark chocolate. Kids often don’t eat many of these foods, so this is why topping up your child’s magnesium through supplements may be necessary.

I love kids to enjoy a magnesium-rich Epsom salt bath four or five nights a week (a couple of cups swished into the water and soak for at least 20 minutes). For supplementation, magnesium bisglycinate at around 100 to 200mg before bed often works well for most school-age children and it can help with sleep quality as well as the next day.

The B vitamin trio

B vitamins keep the production line of your child’s neurotransmitters running. Vitamin B6 in particular is needed to convert tryptophan into serotonin and to make GABA. Some functional medicine practitioners find a pattern that if a child does not dream, this is an indicator they need more vitamin B6, and if they have vivid dreams or tingly fingers and toes then they need to stop it.

Folate (B9) and vitamin B12 work as buddies that drive the methylation cycle, which is so vital for mood and cognition. A significant proportion of anxious children have a genetic variation called MTHFR, which makes folate harder to process, and this means they need to prioritise eating folate-rich foods such as eggs, beans and green veggies. At NatureDoc can test for the MTHFR genetic SNPs with a simple oral swab, and where it shows up, switching to methylated forms of folate and vitamin B12 often makes a real difference to their anxiety.

The best food sources to cover all three of these B vitamins include eggs, red meat, fish, shellfish, dark green salad leaves, green veggies, lentils and beans.

Zinc, the mood stabiliser

Zinc is needed to make serotonin, GABA and our sleepy hormone melatonin. It can also keep the amygdala (the brain’s fear centre) from over-firing. It is the second most abundant mineral in the nervous system, so getting enough zinc is vital. It is often depleted in adolescence and puberty as the body needs additional zinc to help your child develop into a young adult, and this is the time when anxiety often ramps up.

Low zinc levels are often linked with a state of hypervigilance, irritability, intense emotional reactions and disrupted sleep. White flecks on the fingernails and a poor sense of taste and smell are classic clues for needing more zinc, as is chewing on non-food items such as their t-shirt, paper tissues and their pen lids.

Pumpkin seeds, beef, lamb, chickpeas, cashews and shellfish are the best food sources of zinc, and many kids need to top up with a supplement at around 8-12mg daily for around 3 months if they are showing signs of a zinc deficiency.

Omega 3 fatty acids for a calmer brain

The brain is roughly 60% fat, and the long-chain omega-3 fatty acids EPA and DHA are some of its most important building blocks. They keep cell membranes flexible, dampen inflammation in the brain and support the brain pathways that regulate mood, organisation and planning.

Omega-3s are essential for brain development, and there is good adult evidence for mood benefit. The evidence in children and young people is more mixed, but children with very low oily fish intake are likely to benefit most from topping up. Two to three portions of oily fish a week (salmon, mackerel, sardines, trout) is the food-first way to get more amazing omegas into them.

I aim for a combined fish oil supplement of EPA and DHA of around 650 to 1,000mg a day for an anxious child, which can be from a good-quality fish oil or algae supplement source.

Vitamin D, the good-mood vitamin

Vitamin D receptors are scattered throughout the brain, and vitamin D plays a vital role in serotonin production, the happy feel-good neurotransmitter.

A deficiency in vitamin D is extremely common amongst UK children, especially during the dark months from October through to April and studies link low vitamin D with higher rates of anxiety and depression. Thankfully, children living in countries without much sunshine can benefit from supplementation, and studies find that deficient children taking vitamin D supplements find improvements in their mood and anxiety scores.

A private blood test or quick lateral-flow type finger prick test from your chemist can tell if your child is deficient in vitamin D. If you don’t have a blood test that shows a deficiency, then a maintenance dose of 400 to 1,000 IU a day suits most children through winter and when the weather is cloudy and grey.

Watch out for low iron

Low iron is one of the most overlooked drivers of anxiety in children, especially in girls heading towards puberty or around the time when their periods start. Vegetarian and vegan children, and any child who eats very little red meat, could easily become depleted in iron, too.

Iron is needed for oxygen delivery to the brain and for making dopamine, the neurotransmitter which helps with motivation. Low iron in mid-childhood links low iron in mid-childhood with higher rates of anxiety and behavioural problems during the teen years, so it is important not to let your child’s iron levels dip.

The clues for suspecting low iron include tiredness that does not lift with sleep, poor concentration, restless legs, mood that dips in the afternoon, and breathlessness when climbing the stairs. They often look pale and washed out.

A blood test through your GP for ferritin (iron stores) and haemoglobin can tell you most of what you need to know about their iron status. Aim for a ferritin above 30 ng/mL, ideally 70 ng/mL to optimise dopamine production and your anxious child and their nervous system will reap the benefits. Raising iron levels may involve supplements to help their iron levels climb effectively.

Good food sources of iron include red meat, sardines, lentils, beans and pulses, and dark green vegetables. Always serve iron-rich foods with vitamin C-rich foods like a satsuma or some strawberries to boost absorption.

Calming daily habits

Getting the choice of foods and supplements right is only half the story when you have an anxious bunny in your household. The following daily rhythms and habits make the biggest difference if you want to help your child feel calmer.

Protein at breakfast

Skipping breakfast or starting the day on a sugary cereal sets a child up for a stress-response rollercoaster. Missing breakfast raises the odds of anxiety in adolescents and teenagers, and if they are a breakfast-dodger, send them off with food in their school bag, even if they have to catch an early school bus.

Aim for protein with every breakfast which could look like eggs, smoked salmon, full-fat Greek yoghurt with seeds, nut butter on wholegrain toast, or even last night’s leftovers. The amino acid tryptophan from protein is the starting point for serotonin and is a high priority if you need to support your child’s mood. The protein also stabilises their blood sugar.

Steady blood sugar through the day

Big sugar spikes are then followed by big crashes, and a crashing blood sugar feels almost identical to anxiety. Symptoms include a racing heart, shakiness, irritability and an urgent need to eat.

To help keep their blood sugars even, pair every snack with some protein or healthy fat, such as an apple with almond butter, oatcakes with cheese, a banana with Greek yoghurt and try to keep the gaps between meals to no more than three to four hours during the school day. Their blood sugar and their mood will love you for making this a priority.

Sleep, the master regulator

Poor sleep and anxiety are tightly linked, and the relationship goes both ways. Sometimes getting to sleep and staying asleep can be the first signs of anxiety and it may be the hardest aspect to crack at the outset, and you may need to turn to supplements like saffron, theanine, lemon balm and magnesium to help induce sleep and prevent wake ups.

A consistent bedtime, screens off at least an hour before sleep and a warm bath all help too. For most school-age children, 10 to 11 hours is the right target to aim for; although in teenagers, this might look more like 8-9 hours.

Cut back on sugary drinks and UPFs

You do not need to eliminate everything that they love, but cutting right back on ultra-processed snacks, sweet or caffeinated drinks, sweeties eaten on their own, and foods packed with emulsifiers or preservatives all tend to settle anxious kids over a few weeks.

This is because reviews of ultra-processed food consumption in children consistently link higher intakes with worse mental health outcomes, so keeping UPFs to 20% of the diet (around four times a week) can really help to move towards a calmer child. Cooking from scratch also means that you can prioritise the ingredients containing the nutrients that serve their nervous system best.

Round up

If your child is anxious too much of the time and their worries consume their thoughts, then food is one of the most powerful and underused tools you have. You probably have some of these foods in your kitchen already, so you can start straight away!

Even the simple step of getting protein into their breakfast really helps and so does prioritising their sleep. And remember to check their basic nutrients including iron, zinc, magnesium, folate, vitamin B12 and vitamin D if things are not shifting for the better. Most children settle and feel calmer within a month or two of making these achievable changes.

If you are not sure where to begin, or you have done the obvious things and your child is still riddled with anxiety, get in touch with our NatureDoc clinical team. We will go through a thorough health and diet history, organise the right lab tests and build a health plan that is personalised to your child.

And if this blog has been useful, do please share it with another parent who is searching for answers to their child’s anxiety. So many families are looking for the missing piece in the puzzle, and sometimes the starting point really is what is in their breakfast bowl.

This is the first of a series of blogs I have written on nutrition for anxious children. In part two you will read about the gut–brain link, including dysbiosis, SIBO and the bacteria that drive inflammation. And in part three I share the deeper immune and metabolic reasons for anxiety.

Ask me what supplements can help… or anything else!

This blog was first published on 19th February 2017 and updated in 2026.

References

Responses

K Holland Mon, 20th Feb 2017

Thank you that is a fantastic and helpful resume! x

Amy green Tue, 21st Feb 2017

Thank you for this useful information. My child has autism and anxiety and is currently a very fussy eater. Will supplements provide the solution when certain foods are not eaten?

beth Tue, 21st Feb 2017

Thank you, this is wonderfully helpful. I wonder about the run around the park? I read running can increase cortisol levels?

1. Lucinda Miller Wed, 22nd Feb 2017
  
  I think a run last thing at night may heighten cortisol levels in someone with a tendency to higher levels. In most cases running balances it nicely!
  
2. Lucinda Miller Wed, 22nd Feb 2017
  
  Supplements can very useful if a child is a fussy eater or they have a higher need for a specific nutrient that an average diet cannot provide. I hope this is helpful! Many thanks.