Conversations around diet can be clouded by extremes, but there is scientific consensus that some foods contribute more directly to inflammation than others. “Chronic, low-grade inflammation underlies many long-term health conditions, from cardiovascular disease to autoimmune disorders,” says Dr. Elaine Torres, a nutrition researcher at King’s College London. “Diet is not the only factor, but it is one of the most powerful levers we have.”
So which foods are most closely linked with inflammation—and how can they be managed?
1. Gluten-heavy modern wheat
The gluten found in today’s bread and pasta is not the same as the gluten of centuries past. Hybridisation and intensive agriculture have altered the grain, making it denser, higher-yielding, and harder for the digestive tract to break down. Poorly digested gluten can disrupt the balance of bacteria in the gut, increase permeability of the intestinal wall, and set off immune reactions.
Not everyone needs to avoid it entirely, but reducing reliance on refined wheat can be beneficial. Nutritionist Carla Mendes recommends replacing supermarket white loaves with naturally fermented sourdough or breads made from ancient grains like einkorn or emmer, which contain less gluten and are easier to digest.
2. Low-quality dairy
Milk was once a nutrient-rich staple, but modern production has changed its profile dramatically. Grain-fed cows produce milk higher in inflammatory omega-6 fatty acids, while industrial farming can introduce residues of antibiotics, pesticides, and hormones. On top of that, many adults struggle with lactose, which ferments in the gut and can trigger bloating, skin flare-ups, and joint discomfort.
“Not all dairy is equal,” says dietitian Marcus Ellery. “Raw or grass-fed varieties from goats and sheep tend to be better tolerated, while aged cheeses like parmesan or pecorino are naturally low in lactose.” Fermented options such as yogurt and kefir also bring beneficial bacteria that support gut health.
3. Processed and red meats
Sausages, bacon, deli meats, and even heavily charred steaks are high in advanced glycation end products (AGEs)—compounds formed during high-temperature cooking that are known to trigger inflammatory pathways. Additives like nitrates and nitrites in processed meats further contribute to oxidative stress.
“Meat itself is not inherently the problem,” says Dr. Anika Rao, an endocrinologist and metabolic health specialist. “It’s the form and the frequency.” She suggests choosing lean cuts of grass-fed beef on occasion and balancing them with poultry, oily fish, legumes, or tofu.
4. Refined sugars and packaged sweets
Soft drinks, pastries, and ultra-processed snacks are not just empty calories—they flood the bloodstream with glucose, creating sharp peaks and crashes. Over time, this rollercoaster contributes to insulin resistance, an inflammatory state linked to type 2 diabetes and hormonal imbalance.
“Refined sugar also feeds the less beneficial bacteria in the gut, which further drives inflammation,” explains Ellery. Natural sugars, such as those found in whole fruit, are less problematic because they come with fibre and antioxidants that slow absorption. Reading labels is crucial—sugar hides under names like high-fructose corn syrup, dextrose, maltose, and fruit juice concentrate.
5. Deep-fried foods and refined oils
Fried chicken, French fries, and battered snacks share a common issue: the oils used to cook them. Refined seed oils (such as soybean or corn oil) break down at high heat, forming trans fats and oxidised compounds that increase oxidative stress. Regular intake doesn’t just inflame tissues—it also disrupts hormone regulation and the gut microbiome.
“Occasional frying in olive or avocado oil at home is a different story,” says Dr. Rao. “But habitual deep-fried takeout meals are a recipe for chronic inflammation.”
The Takeaway
Inflammation is not caused by one food alone, but by consistent dietary patterns. Avoiding or minimising these five culprits—while leaning toward whole, nutrient-dense alternatives—can help restore balance. In practice, this might look like swapping a breakfast pastry for sourdough with avocado, trading fried snacks for roasted root vegetables, or replacing processed meat with lentil stew. Small shifts, consistently applied, can have an outsized impact on long-term health.
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