http://www.sciencedaily.com/release...50722144640.htm




I put the question mark on the title because the findings here aren't quite new.

http://www.ncbi.nlm.nih.gov/pubmed/24081493



And they may or may not apply to humans. Some of the same enzymes needed to produce the essential fatty acid DHA from linolenic acid are also needed to produce arachidonic acid from linoleic acid. Plus, the mice are fed a purified diet pretty much devoid of any pre-formed arachidonic acid, epa or dha--so the arachidonic acid precursor for endocannabinoid production pretty much depends on synthesis from linoleic acid, where in humans eating a diet that contains meat, it probably doesn't.

The effect in mice occurs at 8 percent linoleic acid, and not at 1 percent. And small amounts of fish oil block the effect. I'd love it if they'd do a study with arachidonic acid instead of linoleic acid, as well as the fish oil. If the fish oil were protective at that point, it seems a little more likely there might be an application in humans.

Uh, no. Vegetable oils cannot be beneficial for cardiac health while at the same time inducing obesity and diabetes. It just doesn't work that way. Sounds to me like researchers having to tip-toe around trying not to step on the toes of powerful guys (who control sources of their research funding maybe?) who still buy into those worthless cherry-picked association claims from the 60's about saturated fat being the bad guy in heart disease.

http://journals.plos.org/plosone/ar...al.pone.0132672

Looking at the study itself--the coconut oil is hydrogenated. Linoleic acid content is listed as 2.2 percent in the groups without soy oil, 10 percent in the groups with. All groups did get soy oil to avoid essential fatty acid deficiency, something that would have been likely if the only fat source was hydrogenated coconut oil.



This is interesting in that corn oil is much higher in linoleic acid than soy oil is. While linoleic acid has been shown to be fattening at about 8 percent of intake, at very high levels, there's a luxusconsumption effect that kicks in, rate of metabolism increases, and it's less fattening.

The lard study will probably be questionable. Grass vs. grain fed beef doesn't really change omega 6 content much, just omega 3, because the rumen bacteria don't let much polyunsaturate get through to the animal itself. Chickens and pigs end up carrying the sort of fat that they eat though, so the difference between lard from pigs eating lots of vegetable oil and pigs eating very little vegetable oil could be big.

I'm not surprised that coconut oil is less fattening. I can feel a thermogenic effect whenever I take it. I think it is the MCT's.

Better off I believe, since cutting out the mayo and other dips for my meats. They are all soy based. Butter is better.

or make your own mayo and salad dressings... it isn't that hard and tastes miles better!

I'm sort of luck in that when they started using almost exclusively soy oil in processed foods, I stopped liking them. Soy oil tastes just awful to me.

at least if you're a mouse--

From Eureka Alert: http://www.eurekalert.org/pub_relea...--soc072015.php

Soybean oil causes more obesity than coconut oil and fructose

UNIVERSITY OF CALIFORNIA - RIVERSIDE

RIVERSIDE, Calif. -- A diet high in soybean oil causes more obesity and diabetes than a diet high in fructose, a sugar commonly found in soda and processed foods, according to a just published paper by scientists at the University of California, Riverside.

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.

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.
Discussion from the end of the PLOS article:

There is currently considerable debate in both the scientific literature as well as the lay press as to which components of the American diet are the most obesogenic. Since diet studies in humans involve a large number of variables, most of which cannot be properly controlled, in this study we used mice and precisely defined isocaloric diets to compare the metabolic effects of saturated fat from coconut oil, unsaturated fats from soybean oil and fructose. To our knowledge, this is the first study not only to compare the effects of these three dietary factors in mice, but also to perform genome-wide expression profiling and metabolomics analysis of livers from animals fed a soybean-oil enriched diet. Our results indicate that, contrary to expectation, PUFA-rich soybean oil is more obesogenic and diabetogenic than coconut oil which consists of primarily saturated fat. They also show that fructose is less obesogenic than soybean oil and reveal a striking fatty liver morphology induced by soybean oil as well as a global dysregulation of Cyp genes and disease-associated genes and metabolites in the liver. These effects in the mouse liver could be clinically relevant as NAFLD, a component of the Metabolic Syndrome, is estimated to be present in 20–30% of adults in the U.S. and 3–10% of children

This is the PLOS article:

http://journals.plos.org/plosone/ar...al.pone.0132672

Very lengthy and detailed study. Some jargon but a lot is pretty plain English. PLOS is pretty amazing. A lot of the data is appended if you'd like to look at the actual raw data from the study. Not that I recommend it...

I guess the problem with soybean Omega-6 oil is the pro-inflammatory nature of it.

soybean oil vs coconut oil, thats a no brainer

Good to know!

I am going to make sure I don't buy mayo with soy oil any longer.

Doesn't surprise me... farmers feed soy oil to animals they want to fatten.

As I more and more eliminated these kinds of highly unbalanced seed oils from my diet, I started to have an inflammation reaction when I did consume them, which helped me cut down further.

For those without the time (or in my case, the energy) to make their own mayo (I'll go back to it when I get better) the new mayo Mark Sisson is selling, Paleo Mayo, is FAN-FREAKIN'-TASTIC.

Pro: made with avocado oil Con: $10 a jar

http://www.onestoppaleoshop.com/pro...CFUgWHwod3AUGDg

But you can get three jars, for free shipping, and it's worth it. I eat a lot of seafood and mayo is a staple.

Hmmmm, this mayo is advertised for those who don't have time to make... funny thing is, it takes only a few minutes, less than five, to make mayonnaise!

Or two minutes if you have an immersion blender and pint mason jar. My favourite 10 second solution is to mash a ripe avocado and use like mayonnaise (add lemon or lime juice if you are not eating it all at once).

Ooooh, great idea.... I never thought of that. thanks for the tip!