A recent study found that high doses of oleic acid—a fat found in olive oil—can lead to fat cell growth in mice under lab conditions. Contrary to the study's title, it did not test olive oil or look at what olive oil does in our bodies. There's no evidence that consuming olive oil "drives fat cell growth" or causes weight gain. To the contrary, a recent U.S. study of over 90,000 adults found that people who eat more olive oil tend to gain less weight over time.
