Corn, Sunflower, Safflower, Soybean, and Cottonseed Oils

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You’ve probably heard of almighty omega-3 fatty acids—the molecules that make salmon and walnuts so good for you. But have you heard of omega-6 fatty acids? Regardless, you’re probably eating way too much of them.

Since omega-6 fatty acids are found in soybean oil, and soybean oil is used in just about every packaged food you pluck from grocery store shelves, the typical American diet can contain up to 25 times more omega-6 fatty acids than omega-3 fatty acids. That out-of-wack ratio could be messing with your joints—research shows any ratio bigger than 10 to 1 can cause problems like asthma, cardiovascular disease, and inflammation.

Researchers suggest anyone with rheumatoid arthritis get their ratio down to 2 or 3 to 1. This actually suppressed inflammation in study participants with the condition. Omega-6 fatty acids can also be found in fried foods, margarine, egg yolks, and meats.