Why Seed Oils Are Dangerous (and What You Can Do About It)

I read The Big Fat Surprise by Nina Teicholz last weekend.

The Big Fat Surprise 300 px wide

A friend recommended it to me. When I checked into it myself, the book looked good. The reading proved just as good as it looked, so I’m going to share some of what I discovered.

Nina Teicholz investigates the fats we eat with an open mind. Like most of us, she believed that foods such as butter and cream and red meat were bad for her. But she’d had the experience of losing weight and feeling healthier while eating them with abandon when working as a restaurant review columnist.

What was up with that?

As she dug more deeply into her research for The Big Fat Surprise – reading the actual data from decades of studies, rather than the superficial (and misleading) headline conclusions – she came to realize how thoroughly the wool had been pulled over our eyes about what is safe and healthy to eat.

We’ve been fooled by government officials who jumped the gun and made incorrect recommendations before all the data was in.

We’ve been fooled by ambitious scientists who took a position long before the data warranted it, and then defended their stance for all it was worth.

We’ve been fooled by industrial food companies with a lot of money on the line.

I’d hoped The Big Fat Surprise might be a worthy sequel to Gary Taubes’ Good Calories, Bad Calories. It is! The book covers some of the same ground, but Nina Teicholz found different sources to talk with. She takes a slightly different approach from a slightly different angle. I learned things from her compelling narrative that I hadn’t from Taubes’ equally excellent examination of the subject.

Especially important, Teicholz delves into the more recent developments in fats used in processed foods: potato chips, crackers, cookies, etc. The information is absolutely critical for making wise choices about what to eat. And what not to eat. There’s some crazy dangerous stuff out there!

The Big Fat Surprise is too full of valuable nuggets for any summary to do it justice. So I’m going to use a technique I’ve followed when recommending other favorite non-fiction reads.

I’ll share three points that jumped out at me.

Here we go!

cottonseed oil

Eating Seed Oils May Cause Cancer

First of all, what are seed oils? This was a new term for me. Turns out it’s a more accurate word for what we call vegetable oils. Corn oil, canola oil, safflower oil, etc. When you think about the change, it makes sense. These oils aren’t made from carrots or broccoli or bell peppers. They’re pressed (or chemically extracted) from seeds.

One thing to remember about liquid seed oils is that they’re new. They were first extracted and sold in large quantities in 1910. Before 1910, everyone used lard and suet and tallow (animal fats) and butter to cook with. Seed oils are really a novel, ersatz “food.” At this point in human evolution, perhaps 6 generations have been eating the stuff. 300 generations ate only the very small amounts present in the corn in tortillas or the wheat in bread. 66,000 generations ate the still smaller amounts present in gathered (not cultivated) grains.

The new untested nature of seed oils entering our food supply caused a few scientists to be concerned about their safety. Some research was done, and the results generated further cause for concern.

One of the most famous studies was conducted in the 1960’s by Seymour Dayton, a UCLA professor of medicine, on 850 elderly men living in a Veterans Administration home.

For 6 years, half the men ate a diet in which seed oils replaced the saturated fats in butter, milk, ice cream, and cheese.

The other half of the men ate a normal diet – which in those days meant few seed oils, because corn oil and cottonseed oil had not yet been adopted so wholeheartedly in American kitchens.

The superficial results of the study looked good. Of the men on the experimental seed oil diet, only 48 died of heart disease, compared to 70 on the regular foods.

Probing a little deeper, the results looked less good. The death rates of the two groups were similar: 31 of the men consuming seed oils died of cancer, against only 17 of the men on regular food. That’s 79 to 87. Not so significant.

Dr. Dayton expressed considerable concern about the cancer finding. It was the unknown consequences of a diet high in seed oils – a new industrial product that had never been eaten in quantity by humans before – that had prompted the study.

Prominent American researchers focused on the heart disease finding (and ignored the cancer finding), because it bolstered their position that saturated fat causes heart disease.

British researchers were more critical, pointing out that the men on the normal diet happened to have twice the rate of cigarette smoking as the men on the seed oil diet. Perhaps that was the cause of their higher rate of heart disease?

echocardiogram

LDL-Cholesterol Is NOT the Bogeyman

First let’s do a quick review of cholesterol. It’s a lipid molecule made by our bodies and essential for both the structure of our cell membranes and as a foundation for certain hormones, bile acids, and vitamin D. We need the stuff!

It also circulates in our blood and has become renowned as an indicator for our vulnerability to heart disease.

Cholesterol comes in two different kinds. HDL-cholesterol (high density lipoprotein) and