Wellness expert Gary Brecka said Americans consume significantly more seed oils today than in the past, calling the shift “a metabolic experiment” with far-reaching health consequences.

“We used to eat zero seed oils in 1900,” Brecka wrote in a post on X. “Now? The average American consumes 30 pounds per year.”

“This isn’t a diet change, it’s a metabolic experiment,” he added, warning that linoleic acid from seed oils “embeds in your brain,” damages cell membranes, triggers inflammation and hormonal dysfunction, and stays in the body for over a year and a half.

Brecka said removing seed oils may reverse some of these effects. “Energy increases, skin clears, inflammation drops, metabolism becomes flexible again,” he wrote.

Seed oils—such as soybean, corn, and canola oil—contain high amounts of omega-6 fatty acids, particularly linoleic acid. While the body needs some omega-6s, many researchers have noted the dramatic rise in consumption over the last century and have raised concerns about the inflammatory effects of excess intake.

Gary Brecka is a human biologist and co-founder of 10X Health, where he advises individuals and organizations on longevity and performance. His health insights have gained a large following on social media.