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Foods That Cause Inflammation: What Is Quietly Happening in Your Body
Inflammation gets discussed frequently in health circles, and like many frequently discussed concepts it has become somewhat abstract in the process. It is worth being concrete about what it is, why it matters for your long-term health, and specifically which foods that cause inflammation are present in most people's diets without them being aware of the connection.
What Inflammation Actually Is and Why It Matters
Inflammation is the immune system's response to injury, infection, or threat. Acute inflammation is necessary and beneficial. When you cut your finger or fight off a virus, the redness, swelling, and heat you experience are signs of the immune system doing its job effectively and appropriately.
Chronic low-grade inflammation is a different matter entirely. It is the immune system in a state of persistent, low-level activation without a specific injury or infection to resolve. Over years, chronic inflammation causes cumulative damage to tissues and organs and is now understood to be a significant driver of most major age-related diseases, including cardiovascular disease, type 2 diabetes, certain cancers, and neurodegenerative conditions. Diet is one of the most significant and modifiable drivers of chronic inflammation for most people.
The Inflammatory Foods List: Main Dietary Drivers of Inflammation
Refined carbohydrates and added sugar are among the most potent dietary drivers of inflammation. They produce rapid blood sugar spikes and elevated insulin, both of which trigger inflammatory signalling pathways. The research connecting high sugar intake to inflammatory markers is robust and consistent across multiple study types.
Industrial seed oils, including soybean oil, corn oil, sunflower oil, and cottonseed oil, are very high in omega-6 fatty acids. The modern Western diet has dramatically shifted the ratio of omega-6 to omega-3 fatty acids in the direction of omega-6, and this imbalance promotes inflammatory processes throughout the body. These oils are found in most processed and fried food.
Ultra-processed food in general, beyond its sugar and seed oil content, tends to contain emulsifiers, artificial additives, and other compounds that research has associated with gut barrier disruption and subsequent systemic inflammation.
Trans fats, while reduced in many food supplies following regulatory action, are still present in some partially hydrogenated products and are strongly pro-inflammatory.
Excessive alcohol promotes inflammation through multiple pathways, including liver stress and gut microbiome disruption.
Foods That May Drive a Pro-Inflammatory Diet for Some People
Beyond the broadly pro-inflammatory foods above, some people experience inflammatory responses to foods that are generally considered healthy. Gluten-containing grains can drive inflammation in people with celiac disease or non-celiac gluten sensitivity. Certain nightshade vegetables cause issues for some people with inflammatory joint conditions. Dairy produces an inflammatory response in some individuals. These are individual responses rather than universal ones, but they are worth considering if you eat an otherwise clean diet and still experience symptoms associated with chronic inflammation.
What to Do With This Information
The most impactful changes are the most straightforward: reduce refined sugar and refined carbohydrates, reduce processed and fried food, and replace industrial seed oils with olive oil, avocado oil, and butter for cooking. These changes address the dominant dietary drivers of inflammation for most people and do not require specialised knowledge or unusual ingredients. Consistent movement in the right direction over time produces results. The changes do not need to be perfect or immediate to be meaningful.
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