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UK parents

Food, sleep and everyday support

What NICE, NHS and Food Standards Agency guidance actually says about food additives, elimination diets, supplements and sleep — and what it doesn't.

Can food and additives affect a child's behaviour?

Some children appear sensitive to particular things. UK Food Standards Agency guidance concerns a group of six artificial colours — sunset yellow (E110), quinoline yellow (E104), carmoisine (E122), allura red (E129), tartrazine (E102) and ponceau 4R (E124) — which, alongside the preservative sodium benzoate, have been linked with increased hyperactivity in some children. Foods containing them must carry the warning 'may have an adverse effect on activity and attention in children'. That is a labelling requirement, not a statement that food causes ADHD, and the two are often confused.

What does NICE actually say about diet and ADHD?

More usefully than most of what you will read online. NICE guideline NG87 (recommendation 1.6.3) says clinicians should ask about foods or drinks that appear to influence hyperactive behaviour, and — if there is a clear link — advise parents to keep a diary of food and drinks taken and ADHD behaviour. If that diary supports a relationship, the guideline says to offer a referral to a dietitian, with any further steps managed jointly by the dietitian, the specialist and the family. So the recommended first step is not a diet. It is a record.

Should I try an elimination diet?

Not on your own. NICE does not recommend 'few foods' elimination diets in routine practice, and where they are used it is with dietetic supervision, because restricting a growing child's diet carries real nutritional risk and is easy to get wrong. If you believe you have found a trigger, the guideline route is to record it and take that record to your GP so a referral to a dietitian can be considered. Removing food groups first and asking afterwards is the order that causes harm.

What about supplements like omega-3 or iron?

NICE NG87 advises against offering dietary fatty acid supplementation as a treatment for ADHD in children and young people, and instead points to a balanced diet — including oily fish such as salmon, mackerel or sardines — as the way to meet normal requirements. There is research interest in areas such as iron and ferritin status, but the evidence is mixed and none of it makes a supplement a treatment. Never start, stop or change a supplement or medication without speaking to your GP or clinician: some interact with other medicines, and some are harmful at the wrong dose.

How important is sleep?

Sleep and attention are closely linked, and short or irregular sleep makes daytime regulation harder for any child — which is why clinicians ask about it early. The NHS advice is unglamorous and consistent: a regular bedtime and waking time including at weekends, a wind-down routine, a dark and cool room, and screens away well before bed. None of that is a treatment for anything. It is worth doing on its own terms, and worth recording, because a pattern across weeks tells a clinician something that a description of a bad night cannot.

What if sleep is the bigger problem?

Then it deserves attention in its own right, not as a footnote to something else. Persistent sleep difficulty can look very like inattention during the day, and it is one of the alternative explanations a careful clinician will want to consider. It is also something a GP can look at now, without waiting for an assessment. If your record shows months of short or broken sleep, that is worth raising as its own conversation rather than saving it for an appointment that may be a long way off.

What should I be careful of while we wait?

The wait is long and the internet knows it, so this is the point at which paid programmes, supplements and courses promising to reduce symptoms find you. Two reference points are worth holding on to: NICE NG87 for what the clinical guidance actually recommends, and the Food Standards Agency for anything about additives. If a claim goes beyond those, ask your GP before spending money on it. Anything genuinely worth doing will still be worth doing after you have asked.

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Food, sleep and everyday support — ADHD & autism | Striova