The foods most likely to drive inflammation are refined carbohydrates, added sugars, processed meats, and items cooked at very high temperatures. Cutting back on these categories does more for reducing chronic, low-grade inflammation than any single supplement or superfood. Here’s what specifically to limit and why each one matters.
Added Sugars
Eating a diet high in simple sugars raises blood sugar rapidly and increases insulin levels, which promotes a pro-inflammatory state. When this happens repeatedly throughout the day, your body tries to store the excess sugar in fat cells, causing them to enlarge. Over time, this leads to weight gain and insulin resistance, both of which keep inflammation elevated.
The mechanism works partly through your liver. Excess sugar, especially fructose, gets converted into fatty acid building blocks in the liver without the normal feedback mechanisms that would tell your body to slow down. Those fatty acid byproducts trigger inflammatory processes and generate reactive oxygen species, a form of cellular stress that damages tissues.
The Dietary Guidelines for Americans recommend keeping added sugars below 10 percent of your daily calories. For a 2,000-calorie diet, that’s about 50 grams, or roughly 12 teaspoons. The tricky part is that added sugars hide in foods most people don’t think of as sweet: salad dressings, yogurt, granola bars, crackers, sports drinks, and many cereals. Reading ingredient labels matters more than avoiding obvious desserts.
Refined Carbohydrates
Refined carbohydrates are grains stripped of their fiber, fat, and most of their nutrients. Without fiber to slow digestion, they spike your blood sugar just as fast as dessert does. That rapid spike triggers the same pro-inflammatory insulin response as eating candy.
The main offenders are white flour products: white bread, rolls, crackers, regular pasta, white rice, French fries, and sugary cereals. Swapping these for whole-grain versions (brown rice, whole wheat bread, oats) gives your body the fiber it needs to absorb carbohydrates more slowly. The difference isn’t subtle. Whole grains still contain their bran and germ layers, which provide fiber, B vitamins, and minerals that actively help regulate blood sugar rather than spike it.
Processed Meats
Bacon, hot dogs, sausages, deli meats, and other cured or smoked meats are consistently linked to higher inflammation and increased mortality from heart disease, cancer, and respiratory illness. Two specific compounds explain most of the damage: nitrates added during curing and heme iron, the type of iron naturally found in red meat.
Both are pro-oxidants, meaning they promote oxidative damage and inflammation across multiple organ systems. A large population study from the NIH found that nitrate intake alone accounted for about half of the increased overall mortality associated with processed red meat, 72 percent of cardiovascular deaths, and 37 percent of cancer deaths. Heme iron contributed an additional 20 to 24 percent across categories. Nitrates also react with proteins in meat to form compounds called N-nitroso compounds, which have been linked to insulin resistance and coronary heart disease in multiple studies.
It’s worth noting that nitrates from vegetables appear to behave differently in the body and may even benefit cardiovascular health. The concern is specific to nitrates in processed meat and cured products.
High-Heat Cooking Methods
How you cook matters almost as much as what you cook. Grilling, broiling, frying, and searing at high temperatures create compounds called advanced glycation end products, or AGEs. These form when sugars and proteins on the surface of food react at high temperatures, producing that appealing browning and char. As AGEs accumulate in your body over time, they promote oxidation and inflammation, stiffen blood vessels, and modify LDL cholesterol in ways that make it more likely to deposit inside artery walls.
The differences between cooking methods are dramatic. Broiling a hot dog produces roughly 50 percent more AGEs than boiling the same hot dog for seven minutes. Boiling chicken yields only about one-fifth the AGEs of broiled chicken. Broiling (around 440°F) and frying (around 350°F) create the highest levels, while steaming, braising, poaching, and boiling generate far less. You don’t need to eliminate grilling entirely, but shifting toward moist, lower-temperature cooking methods more often is one of the simplest ways to reduce your inflammatory load.
Alcohol
Alcohol’s relationship with inflammation is more nuanced than the other categories. Research published in Circulation measured C-reactive protein (CRP), a key marker of systemic inflammation, across different drinking levels. People who drank 5 to 7 drinks per week actually had lower CRP levels (median 1.60 mg/L) than nondrinkers (median 2.60 mg/L). But at heavier consumption (two or more drinks daily), CRP levels ticked back up to 1.80 mg/L, suggesting a threshold effect.
This doesn’t mean moderate drinking is anti-inflammatory medicine. The data reflects a U-shaped curve where light to moderate intake correlates with lower inflammation markers, but heavy drinking clearly pushes inflammation upward. If you already drink moderately, there’s no inflammatory reason to stop. If you don’t drink, there’s no reason to start for this benefit alone. Heavy or binge drinking, however, belongs firmly on the “avoid” list for anyone concerned about chronic inflammation.
Ultra-Processed Foods and Emulsifiers
Beyond the specific ingredients above, the broader category of ultra-processed foods deserves attention. Many packaged foods contain emulsifiers, compounds that keep ingredients from separating. Common ones include carboxymethylcellulose (CMC) and polysorbate 80. Animal studies and in vitro research suggest these can impair the gut lining barrier and reduce the diversity of gut bacteria.
A small but well-designed human trial found that healthy adults who consumed 15 grams of CMC daily for just 14 days experienced abdominal discomfort, reduced microbiota diversity, and lower levels of short-chain fatty acids (compounds your gut bacteria produce that actively fight inflammation). Disruptions to gut bacteria and increased gut inflammation can contribute to the kind of low-grade systemic inflammation that affects other organs over time. European clinical guidelines now recommend that people at high risk for inflammatory bowel disease avoid ultra-processed foods and CMC specifically, though the evidence base is still growing.
What About Nightshade Vegetables?
Tomatoes, peppers, eggplant, and potatoes are nightshades, and you’ll find plenty of anti-inflammatory diet lists that tell you to avoid them. The actual evidence doesn’t support this for most people. Older mouse studies suggested that solanine, a compound in nightshades, damaged the gut lining. But more recent mouse research found the opposite: purple potatoes and goji berries (also a nightshade) reduced inflammation and improved gut barrier function. And mouse studies in general translate poorly to humans.
No research suggests that the solanine levels in normal nightshade vegetables are toxic to humans. The one exception is green potatoes, which develop unusually high solanine levels and should be avoided. If you have arthritis or another inflammatory condition and suspect nightshades bother you, the Arthritis Foundation suggests eliminating them for two weeks, then reintroducing them one at a time with about three days between each. If your symptoms don’t change, there’s no reason to give up these nutrient-rich foods.
Putting It Together
The pattern across all these categories is consistent: the foods that drive inflammation are the ones that spike blood sugar, promote oxidative stress, or disrupt the gut lining. Refined sugars and white flour products do the first. Processed meats and high-heat cooking do the second. Ultra-processed foods with long ingredient lists do the third. Reducing your intake across all of these categories has a compounding effect, because inflammation from different sources doesn’t just add up, it amplifies. Replacing these foods with whole grains, vegetables, fruits, legumes, nuts, and fish addresses the problem from both directions, removing inflammatory triggers while adding compounds that actively resolve inflammation.