When you cook with soybean oil, heat can turn it into a harmful chemical called 4HNE, which can damage your cells' energy factories and cause long-term body inflammation.

The study found that heating soybean oil many times makes it harmful, causing blood pressure to rise and blood vessels to become inflamed — which is exactly what happens when bad chemicals like 4HNE form from overheated oil.

The study gave mice harmful byproducts created when soybean oil goes bad, and those byproducts damaged their liver cells and caused inflammation — just like the claim says happens when you cook with soybean oil.