Most parents have heard the word “inflammation” in the context of a sore knee or a bee sting. That kind of inflammation is acute — it happens fast, it is visible, and it resolves. But there is another kind of inflammation that works much more quietly, and it is increasingly being recognised as something that matters for children’s long-term health.
This is called low-grade chronic inflammation, and it is one of the areas I have spent time researching.
What is low-grade inflammation?
Low-grade inflammation is a subtle, ongoing activation of the immune system. Unlike the redness and swelling of an injury, it does not produce obvious symptoms. Instead, it simmers away in the background, and over time it can contribute to a range of health outcomes — from metabolic conditions to mental health difficulties.
We measure it using biological markers in the blood, such as C-reactive protein (CRP), interleukin-6 (IL-6), and tumour necrosis factor-alpha (TNF-alpha). When these markers are consistently elevated, even at low levels, it tells us the immune system is in a state of ongoing low-level activation.
What is particularly important is that this process does not just begin in adulthood. It can be present in childhood and adolescence, and the earlier it takes hold, the more time it has to influence health trajectories.
What my research found
In a systematic review I led at Deakin University, published in Nutrients in 2021 (cited 138 times), I examined 53 studies looking at dietary intake and inflammatory biomarkers in children and young people aged 2 to 19 (Bujtor et al., 2021).
What we found was a consistent pattern across the evidence. Children and adolescents whose diets were characterised by higher intakes of vegetables, fruit, wholegrains, fibre, and healthy fats — patterns that align with what is often called a Mediterranean-style diet — tended to have lower levels of inflammatory markers.
On the other hand, dietary patterns characterised by processed foods, added sugars, and what researchers call a “Western” dietary pattern were associated with elevated levels of those same markers. In other words, the composition of a child’s overall diet appears to have a measurable relationship with the activity of their immune system.
This is not about any single food being “good” or “bad.” It is about the overall pattern of eating over time.
Why this matters for families
For parents, the practical relevance of this research is that the everyday food environment you create at home may be quietly influencing your child’s inflammatory profile. That does not mean every meal needs to be perfect — far from it. But it does mean that a general direction of travel toward a more varied, whole-food-based diet could be genuinely supportive of your child’s health at a biological level.
It is also worth noting that this research looks at dietary patterns, not individual nutrients in isolation. That is an important distinction. Focusing on one “superfood” or eliminating one “bad” food is unlikely to have the same effect as gradually shifting the overall balance of what a child eats across the week.
What this might look like in practice
You might like to think about the general direction of your family’s eating rather than any rigid rules. Some things that the evidence suggests could be helpful:
More variety in vegetables and fruit. This does not need to happen overnight. Even small, gradual increases in the range of plant foods a child is exposed to can shift the overall balance.
Including wholegrains where you can. Swapping white bread for wholemeal some of the time, or choosing oats over sugary cereals, are small changes that add up.
Healthy fats from sources like olive oil, nuts, seeds, and oily fish. These are central to Mediterranean-style eating patterns and are associated with lower inflammatory markers in the research.
Reducing the frequency of ultra-processed foods and drinks high in added sugar. Again, this is about the overall pattern rather than occasional treats.
The key word here is “pattern.” No single meal or snack is going to make or break a child’s inflammatory profile. What the evidence points to is the cumulative effect of dietary habits over time.
A note on children with feeding difficulties
For families where eating is already a source of stress — where a child has a very restricted diet, sensory-based food aversions, or anxiety around mealtimes — this research is not intended to add pressure or create a sense of judgement. In many cases, children rely heavily, or even entirely, on a small number of foods, which may include ultra-processed foods, because these feel safe, predictable, and manageable from a sensory and emotional perspective. This is not a reflection of poor parenting or a lack of effort. It is often the child doing the best they can with the skills and capacity they currently have.
Widening the diet of a child who is struggling with food is a gradual, supported process that needs to happen at the child’s pace. It involves building trust, reducing anxiety, and developing the underlying sensory and oral-motor skills required for eating — not forcing change before the child is ready.
What this evidence does offer is a broader understanding of why the work of expanding a child’s diet matters. It is not just about the immediate challenge of getting more foods accepted. It is about supporting the child’s long-term health in ways that are not always visible in the short term.
If your child has a very limited diet and you are concerned about their nutritional status, working with someone who understands both the nutritional and developmental aspects of feeding can help you find a way forward that is supportive, realistic, and does not rely on pressure or force.
The bigger picture
This is one piece of a much larger puzzle. Diet does not exist in isolation — it interacts with sleep, physical activity, stress, and a child’s overall developmental context. In my research, I have become increasingly interested in how these factors work together, which is something I explored deeply in my doctoral research work.
But the evidence on diet and inflammation in children is robust and growing, and it reinforces something that many parents already sense intuitively: the food we offer our children genuinely matters. Not because any single choice is critical, but because the overall pattern of eating shapes health in ways that go well beyond what we can see on the surface.
Reference: Bujtor M, Turner AI, Torres SJ, Esteban-Gonzalo L, Pariante CM, Borsini A. (2021). Associations of Dietary Intake on Biological Markers of Inflammation in Children and Adolescents: A Systematic Review. Nutrients, 13(2):356. https://doi.org/10.3390/nu13020356
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