Seed Oils
These oils—which include canola, grapeseed, sunflower, and soy—are extracted from the seeds of plants. Critics say that their high levels of omega-6 fats raise inflammation in the body and that consuming them can lead to cancer, heart disease, type 2 diabetes, and other illnesses.But the scientific evidence doesn't support that. "In dozens of studies looking at omega-6s and inflammation, I haven't seen one that shows an inflammatory effect, and roughly half of studies are showing anti-inflammatory effects," Willett says. For example, a 2019 review of 30 studies, published in the journal Circulation, found that people with the highest blood levels of a type of omega-6 fat called linoleic acid had a 7 percent lower risk of cardiovascular disease, possibly because linoleic acid reduces inflammation. Plus, Willett says, we've known for decades that these oils also cut LDL ("bad") cholesterol levels, and a higher intake of them has contributed significantly to the large decline in deaths from heart disease in the U.S."
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