Dietary fats are a crucial component of a healthy diet, but the devil's in the details, and the type of fats you choose can make a world of difference. Replacing dangerous oils with healthy fats is one simple way to boost your health and reduce your risk of chronic disease.
Sadly, the fats that promote ill health are the very ones we've been told are the healthiest, and vice versa. Among the absolute worst types of fat you can eat are vegetable oils, such as corn oil, soybean oil, sunflower and canola oil, found in most processed foods and restaurant meals.
According to the 2017 U.S. Department of Agriculture report,1 "U.S. Trends in Food Availability," consumption of saturated animal fats such as butter, lard and beef tallow fell by 27% between 1970 and 2014, while consumption of vegetable oils rose by 87%. Intake of salad and cooking oils specifically rose by a remarkable 248%.
In my view, processed vegetable oils, rich in omega-6 polyunsaturated fatty acids (PUFAs), are the most dangerous dietary factor of them all, taking a greater toll on human health than high fructose corn syrup even.
Not only have vegetable oils been linked to heart disease, gastrointestinal diseases such as irritable bowel disorder, and inflammatory conditions such as arthritis, they've also been linked to cancer, especially neuroblastoma, breast, prostate, colon and lung cancer. 2
Vegetable Oils — A Hidden Cause of Cancer
In a November 8, 2019, Medium article,3 Maria Cross, a nutritionist with a master of science degree, discusses the science behind vegetable oils and what makes them carcinogenic. She explains:
"There are two classes of PUFA: omega-6 and omega-3. Although functionally distinct and non-interchangeable, these two classes are perpetually engaged in a metabolic balancing act, pushing and pulling as they compete for absorption in the body.
There is nothing intrinsically wrong with omega-6 PUFAs: we need them … If omega-6 fat is essential to health, it makes no sense that it can also cause cancer …
That's why scientists believe that it is not omega-6 per se that is to blame; it's the balance between the two groups of PUFA that is out of kilter and wreaking havoc on our bodies. We evolved on, and are genetically adapted to, a diet that provides more or less equal amounts of omega-3 and omega-64 …
With the industrialization of our diets, and the vast quantities of vegetable cooking oils that go into them, the ratio between omega-6 and omega-3 has shifted enormously and we consume up to 25 times5 more omega-6 than omega-3 …
There can only be consequences, and indeed there are: experimental data6 supports the theory that it is this skewed balance between the two PUFAs that influences the development of a tumor."