The goal of articles like these (in my opinion) is to cast doubt in your mind about eating or not eating certain foods. The article might be "sponsored" by a large food industry who wants you to think there is no right answer, so you might as well a bit of eat anything (meat, sugar, oils, fast food).

As a rule of thumb: the higher up the food chain you eat, the more likely you are eating pollutants. Fish have been found to have like levels of heavy metals and even plastics. Also avoid eating anything processed with ingredients you can't pronounce