From frying to failing health: Dangers of reusing vegetable oil

Fried food is a staple across Nigeria, from crispy plantains and yam to akara and puff-puff. But while the aroma is unbeatable and that taste is yummy, we don’t often talk about the health risks that come from reusing vegetable oil.

In many homes and roadside vendors, oil is reused again and again, sometimes until it turns dark and thick.

For snacks vendors like Kemi (not real name) in Lagos, it’s a matter of cost. “Oil is expensive. We can’t throw it away after one use,” she says. But what feels like saving money may be putting health on the line.

When Oil Turns Toxic

Every time oil is heated, it breaks down. This creates harmful substances like trans fats, free radicals, and toxins — that don’t just spoil the flavour but can damage your body over time.

Risk to Your Heart

Reused oil raises bad cholesterol and lowers good cholesterol, increasing your risk of high blood pressure and heart disease. The darker and thicker the oil gets, the more dangerous it becomes.

Stomach Trouble

Oils used too many times can cause acidity, bloating, and digestive discomfort. Over time, this can lead to more serious issues like acid reflux or IBS.

Cancer Concerns

This is the biggest red flag. Reheated oil can produce carcinogenic compounds — chemicals linked to cell damage and cancer. These build up in food and in the air, especially in enclosed cooking spaces.

What To Do

Firstly, avoid using oil more than 2–3 times.

Secondly, choose healthier cooking methods when you can, like baking or grilling.

Thirdly, store oil properly in a cool, dark place.

And fourthly, don’t inhale fumes from overheated oil, ventilate your kitchen.

Save your health, not just money. Reusing oil might seem like a harmless shortcut, but it could have serious consequences. Protecting your health starts with what goes into the frying pan