Is olive oil making you fat?
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They say olive oil is liquid gold — but too much might be making the wrong part of your body rich.

A recent study featured in the journal Cell Reports highlights that consuming a diet rich in oleic acid—known as the monounsaturated fat predominant in olive oil—might contribute to obesity by accelerating the expansion of fat cells.

“We’ve observed that the types of fats consumed have evolved during the obesity crisis,” stated Michael Rudolph, an assistant professor specializing in biochemistry and physiology at the University of Oklahoma College of Medicine, in a press release.


Olive oil being poured into a small bowl next to olives and olive oil bottles.
Olive oil could be fueling obesity by supercharging the growth of fat cells. fahrwasser – stock.adobe.com

“We aimed to determine if merely consuming a high-fat diet leads to obesity or if the specific composition of fatty acids within dietary oils plays a crucial role. Are distinct fat molecules eliciting responses within the cells?”

Rudolph and his team fed mice a series of specialized diets, each rich in a different type of fat, including those found in coconut oil, peanut oil, milk, lard and soybean oil.

Only oleic acid — the type found in abundance in olive oil and many processed foods — triggered a spike in the proliferation of precursor fat cells by boosting a growth protein called AKT2 and suppressing a regulatory protein known as LXR.

In short: more fat cells, more fat storage and more inches to your waistline.

“You can think of the fat cells as an army,” Rudolph said.

“When you give oleic acid, it initially increases the number of ‘fat cell soldiers’ in the army, which creates a larger capacity to store excess dietary nutrients. Over time, if the excess nutrients overtake the number of fat cells, obesity can occur, which can then lead to cardiovascular disease or diabetes if not controlled.”

The researchers admit that most people don’t eat isolated fats in a vacuum — a latte here, a salad there and a burger for dinner all mix different fatty acids.


Woman measuring her waist with a tape measure.
Too much oleic acid — which is found in olive oil — means more fat cells, more fat storage and more inches to your waistline. ÚøÃâ¬Ã¸Ã»Ã» àÃâ¹Ã¶Ã¾Ã² – stock.adobe.com

But diets dominated by oleic acid, particularly from ultra-processed food, may become a problem for your pumper.

“I think the take-home message is moderation and to consume fats from a variety of different sources,” Rudolph said.

“Relatively balanced levels of oleic acid seem to be beneficial, but higher and prolonged levels may be detrimental. If someone is at risk for heart disease, high levels of oleic acid may not be a good idea.”

Before you chuck your olive oil into the trash, bear in mind that it remains one of the healthiest fats around — when consumed in reasonable amounts.

It’s packed with antioxidants and has been linked to improved heart health, brain function and even reduced cancer risk.

Other studies have shown that daily olive oil intake may reduce the risk of dementia and improve blood pressure when swapped in for butter.

So olive oil still reigns supreme — but it turns out even the good guys can send in too many troops.

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