The Biggest Difference Between Soybean Oil and Coconut Oil is Obesity and Diabetes
Whether it be its oil, sauce or tofu, trusting anything soy these days is like playing Russian roulette. Up to 80 percent of the oil consumed in the U.S. today comes from soybeans, yet it is commonly hydrogenated and causing more obesity and diabetes than even diets high in fructose from sodas and processed foods.
According to a just published paper by scientists at the University of California, Riverside, "Soybean oil is more obesogenic and diabetogenic than coconut oil and fructose in mouse: potential role for the liver," was published in the journal PLOS ONE.
While marketers will have you believe that soy is beneficial because our healthy Asian counterparts consume it regularly, this is arguably one of the biggest nutritional myths out there. Asians enjoy soy in its fermented state and in considerably smaller quantities than we do.
Ninety-three percent of American soy is GMO and most of the soy we consume is in its unfermented state. This highly processed soy has been linked to numerous conditions including thyroid damage and hormone disruption thanks to its large quantities of estrogen-like compounds called phytoestrogens.
It's highly processed and heavily hydrogenated and found in a vast majority of products on supermarket shelves. And don't think choosing organic soy makes you any safer... as some so-called "organic" soy farms have been found to be fraudulent... passing off the GMO-product for the real thing. It's best to avoid soybean oil completely.
The scientists fed male mice a series of four diets that contained 40 percent fat, similar to what Americans currently consume. In one diet the researchers used coconut oil, which consists primarily of saturated fat. In the second diet about half of the coconut oil was replaced with soybean oil, which contains primarily polyunsaturated fats and is a main ingredient in vegetable oil. That diet corresponded with roughly the amount of soybean oil Americans currently consume.
Your poly fat intake should be around 33% of your total fat intake. The high poly percentage found in soybean oil is an aid to tumors and cancer and should be carefully observed.
The other two diets had added fructose, comparable to the amount consumed by many Americans. All four diets contained the same number of calories and there was no significant difference in the amount of food eaten by the mice on the diets. Thus, the researchers were able to study the effects of the different oils and fructose in the context of a constant caloric intake.
Compared to mice on the high coconut oil diet, mice on the high soybean oil diet showed increased weight gain, larger fat deposits, a fatty liver with signs of injury, diabetes and insulin resistance, all of which are part of the Metabolic Syndrome. Fructose in the diet had less severe metabolic effects than soybean oil although it did cause more negative effects in the kidney and a marked increase in prolapsed rectums, a symptom of inflammatory bowel disease (IBD), which like obesity is on the rise.
The mice on the soybean oil-enriched diet gained almost 25 percent more weight than the mice on the coconut oil diet and 9 percent more weight than those on the fructose-enriched diet. And the mice on the fructose-enriched diet gained 12 percent more weight than those on a coconut oil rich diet.
"This was a major surprise for us -- that soybean oil is causing more obesity and diabetes than fructose -- especially when you see headlines everyday about the potential role of sugar consumption in the current obesity epidemic," said Poonamjot Deol, the assistant project scientist who directed the project in the lab of Frances M. Sladek, a professor of cell biology and neuroscience.
The paper, "Soybean oil is more obesogenic and diabetogenic than coconut oil and fructose in mouse: potential role for the liver," was published July 22 in the journal PLOS ONE.
In the U.S. the consumption of soybean oil has increased greatly in the last four decades due to a number of factors, including results from studies in the 1960s that found a positive correlation between saturated fatty acids and the risk of cardiovascular disease. As a result of these studies, nutritional guidelines were created that encouraged people to reduce their intake of saturated fats, commonly found in meat and dairy products, and increase their intake of polyunsaturated fatty acids found in plant oils, such as soybean oil.
Implementation of those new guidelines, as well as an increase in the cultivation of soybeans in the United States, has led to a remarkable increase in the consumption of soybean oil, which is found in processed foods, margarines, salad dressings and snack foods. Soybean oil now accounts for 60 percent of edible oil consumed in the United States. That increase in soybean oil consumption mirrors the rise in obesity rates in the United States in recent decades.
During the same time, fructose consumption in the United States significantly increased, from about 37 grams per day in 1977 to about 49 grams per day in 2004.
The research outlined in the paper is believed to be the first side-by-side look at the impacts of saturated fat, unsaturated fat and fructose on obesity, diabetes, insulin resistance and nonalcoholic fatty liver disease, which along with heart disease and hypertension, are referred to as the Metabolic Syndrome.
The study also includes extensive analysis of changes in gene expression and metabolite levels in the livers of mice fed these diets. The most striking results were those showing that soybean oil significantly affects the expression of many genes that metabolize drugs and other foreign compounds that enter the body, suggesting that a soybean oil-enriched diet could affect one’s response to drugs and environmental toxicants, if humans show the same response as mice.
The UC Riverside researchers also did a study with corn oil, which induced more obesity than coconut oil but not quite as much as soybean oil. They are currently doing tests with lard and olive oil. They have not tested canola oil or palm oil.
The researchers cautioned that they didn’t study the impacts of the diets on cardiovascular diseases and note in the paper that the consumption of vegetable oils could be beneficial for cardiac health, even if it also induces obesity and diabetes.
They also noted that there are many different types of saturated and unsaturated fats. This is particularly true for the saturated fats in animal products that were associated with heart disease in the studies in the 1960s: they tend to have a longer chain length than the saturated fats in coconut oil.
The latest paper relates to previously released findings by scientists in Sladek’s lab and at the UC Davis West Coast Metabolomics Center, which compared regular soybean oil to a new genetically modified soybean oil.
New research is now deceptively promoting a new genetically modified, high oleic soybean oil (Plenish), which claims to have a lower amount of polyunsaturated fatty acid than traditional soybean oil, but at what cost? Using mice, the researchers found that the Plenish oil also induces fatty liver and only marginally less obesity and diabetes. Don't fall for Plenish oils as the soybeans are genetically modified and designed to be resistant to the herbicide RoundUp.
The researchers are now finalizing a manuscript about these findings that also incorporates tests done with olive oil.
Natasha Longo has a master's degree in nutrition and is a certified fitness and nutritional counselor. She has consulted on public health policy and procurement in Canada, Australia, Spain, Ireland, England and Germany.