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The Alpha Omega fish-oil trial: Sabotaged by "greatness"?

Aug 29, 2010 10:40 EDT



Fish-oil and plant-based (ALA) supplements didn't lower MACE in patients age 60 to 80 who had suffered a prior MI, and it didn't reduce the number of procedures either. Like everyone else, I was disappointed in this study outcome. As a matter of fact, I almost didn't comment on it because it was quite frankly, "lackluster." However, a closer look at what exactly we can take away from this presentation garners a bit of interest.

Every single participant was required to ingest four slices of bread per day slathered with an omega-3– and/or ALA-containing margarine. My first thought was that perhaps the carbohydrate intake offset the benefits of this regimen. Since we are instructed to limit carbs to a healthy 70 g per day to lose weight and a total of 150 carbs per day to avoid weight gain, for some of us that is a significant increase in our daily carb intake. Four slices of bread, depending upon the type and the thickness of the slice, can amount to anywhere from 48 to 60 extra carbs/day. Although there was no recorded weight gain in this trial, the impact of a carb load on glucose metabolism can be very significant. For those who don't believe it, ingest 75 g of glucola, and stick your finger in an hour, and see just how high the glucose of the average human being (well, at least, the average moderately obese American) can soar. To say we are "too sweet" is an understatement. Many of my patients hit a total blood sugar of over 200 mg/dL in the first hour. Since we glycosolate our hemoglobin every single time we go over 180 mg/dL, that's an awful lot of sugar carried to places within our body that it was never meant to be—hence, blindness, kidney failure, coronary artery disease, stroke, and heart attacks abound in the "sweet" population. The study design could have called for a moderately better vehicle for delivery of "healthy" fat to have avoided this question all together.

More important was the point that these patients were exceptionally well treated: 98% were on antithrombotic agents, 90% on antihypertensive therapy, and 86% were taking lipid-lowering medications. In the real world, patients comply with medication regimens less than 50% of the time. It makes one wonder just how well the fish-oil and ALA patients would have done if they had been pitted against patients who weren't under the microscope of study design and follow-up. An "enroll-and-go-your-own-way" arm of this trial might have been an interesting comparator. Perhaps an even better study would have been to pit statin and antiplatelet drugs against fish oil NOT slathered atop a slice of bread, four times daily. As this study suggests, you get much better than "great," and future study designs need to consider this point prior to taking a theory to prime time: remember not to sabotage the study from the outset.


See also:
Alpha Omega Trial: n-3 fatty acids fail to reduce cardiovascular events in post-MI patients








Your comments
The Alpha Omega fish-oil trial: Sabotaged by "greatness"?
# 1 of 9
August 29, 2010 06:20 (EDT)
DGH

Heh Melissa,

Why didn't they use the bread in both groups - in one, a placebo-containing margarine (or regular margarine), in the other omega-3 and/or ALA-containing margarine. Still loads of carbs, but at least no offset by the calorie load all in one arm. Or do it in pill form? 

# 2 of 9
August 30, 2010 03:40 (EDT)
Melissa

Great point DGH.  I think I'd rather have seen a trial with carbs vs. no carbs, and then placebo arm as well!  Guess this comes under the "they didn't ask us" heading !

Thanks for reading/posting! 

Melissa

# 3 of 9
September 2, 2010 01:26 (EDT)
Ray

 

Melissa,

I think that is great that you noticed this study also.

Butter would have been better vehicle than margarine, in my mind.

Margarine is not healthy at all, and could cause enough extra

inflamation to overshadow gains from any source.  I agree also

that the control of dosages each day appeared very loose. Not

a good study to be shooting into the air.  Unfortunately, though, that

is way most studies are done that receive a lot of publicity.

Ray

# 4 of 9
September 2, 2010 02:21 (EDT)
Thomas Scherer

Ray,

hu?

What is the meaning of "not healthy" in this context?

I'd think that the use of butter would not be a solution which is "neutral" in the sense of hidden variables ;-)

But I agree with you last  statement that such studies gain a lot of publicity due to pseudo simple conclusions made.

Regards,

Thomas 

# 5 of 9
September 2, 2010 09:40 (EDT)
David Brown

Dr. Walton-Shirley,

While there's lots of excitement regarding the therapeutic benefits of omega-3s, what I'd like to see, is some trials in which omega-6 is reduced. It's well publicized that Americans consume an estimated ten to thirty times more omega-6s than omega-3s. About a decade ago researchers had this to say about the imbalance.

 "One recommendation deserves explanation here. After much discussion consensus was reached on the importance of reducing the omega-6  polyunsaturated fatty acids (PUFAs) even as the omega-3 PUFAs are increased in the diet of adults and newborns for optimal brain and cardiovascular health and function. This is necessary to reduce adverse effects of excesses of arachidonic acid and its eicosanoid products. Such excesses can occur when too much LA and AA are present in the diet and an adequate supply of dietary omega-3 fatty acids is not available. The adverse effects of too much arachidonic acid and its eicosanoids can be avoided by two interdependent dietary changes. First, the amount of plant oils rich in LA, the parent compound of the omega-6 class, which is converted to AA, needs to be reduced. Second, simultaneously the omega-3 PUFAs need to be increased in the diet. LA can be converted to arachidonic acid and the enzyme, {Delta}-6 desaturase, necessary to desaturate it, is the same one necessary to desaturate LNA, the parent compound of the omega-3 class; each competes with the other for this desaturase. The presence of LNA in the diet can inhibit the conversion of the large amounts of LA in the diets of Western industrialized countries which contain too much dietary plant oils rich in omega-6 PUFAs (e.g. corn, safflower, and soybean oils). The increase of LNA, together with EPA and DHA, and reduction of vegetable oils with high LA content, are necessary to achieve a healthier diet in these countries."

 Journal of the American College of Nutrition, Vol. 18, No. 5, 487-489 (1999)
http://www.jacn.org/cgi/content/full/18/5/487

 More recently, science writer Susan Allport's conducted a 30 day experiment in which she increased her intake of omega-6? http://omega-6-omega-3-balance.omegaoptimize.com/2010/07/25/case-study-30days-of-high-omega6-dietstiffens-arteries-and-increases-belly-fat.aspx

Currently, some of the best research on essential fatty acids is being conducted by Charles Serhan, BBS faculty member of Harvard Medical School. http://www.hms.harvard.edu/dms/bbs/fac/serhan.html

# 6 of 9
September 3, 2010 02:28 (EDT)
Richard Kones MD

Since the study used low doses of omega 3, the serum levels were done on a random basis in the 20th and 40th month, and the method of delivery was carbohydrate force-feeding, with omega-3 spiked margarine, this report only confuses, not clarifies. Applicability to the general public is quite limited. Was the purpose here to justify and market a new spread? The last thing needed is to have yet another "functional food" with a small amount of a beneficial ingredient used as an excuse to consume more calories.

Good data on omega-3 in primary and secondary prevention would be most welcome, but this study disappoints. Better design, conrols and rigor are called for, using blood levels as a continuous variable vs hard outcomes for a longer period--a tough study to coordinate. I am setting it aside with a big question mark.

Sure agree with MWS, in that there is something awry.

Meanwhile, undoubtedly the media will present these data without perspective, and the public, unfortunately, will again have confidence undermined in the ability of scientists and physicians to give clear advice.

Nice to see that EUROASPIRE motivated greater awareness of the guidelines, however.

 

# 7 of 9
September 3, 2010 03:38 (EDT)
Roby Mitchell MD
This whole paradigm of medicating or supplementing your way out of diseases you behave yourself into needs to change. Its unequivocal that one pattern of eating(Standard American Diet) engenders the systemic inflammatory response that is a root cause of disease. Other patterns of eating have the opposite effect. To think that you can reverse the systemic inflammation/oxidation that results in atherosclerosis with sub-therapeutic doses of DHA is mind boggling to me. If we want to reduce our disease incidence to that we see in healthier populations,we have to eat like they do. Not eat like we do and take fish oil and a statin. Its insane.  
# 8 of 9
September 3, 2010 04:43 (EDT)
Richard Kones MD
blank_page

Roby: I could not agree more. I believe that despite everything that is being done, way less than 40% of the total CV risk is being addressed. Did you see the AJC paper on McStatin as a condiment next to the ketchup, to "train" people about the risk per double burger? The authors, like many, think that the statin will fully neutralize the effect, but it does not. Take the JUPITER controversy. Sure JUPITER isn’t a perfect, end-all study. Everyone is up in arms that "healthy" people should be given Crestor. The JUPITER population was just like ours... ostensibly healthy, but really not. 41% MetSyn, 22% hyperlipidemia, etc.  Those patients grumbling have a clear choice—take the weight off and shape up, or face the consequences. But when you tell people to take off weight, stop their slobbering and get serious, they get angry, doctor shop, or hit a few "cleanses" in sequence!  They really want a magic pill, without statin side effects, that costs $7.42, works in 3 hours, and allows them to gorge again.

How does JUPITER, which causes such backlash, differ from a polypill, which people accept? This fish oil study is a farce in the same way. I published a review recently and had to hold back my language when it came to risk factor reduction. Insanity is an understatement.  http://www.dovepress.com/recent-advances-in-the-management-of-chronic-stable-angina-ii-anti-isc-peer-reviewed-article-VHRM

As long as there are studies that allow justification for what people expect and do (or further the delusions), and the food industry is permitted to continue status quo, and the Dept Agriculture subsidizes unwisely, and politicians do not act because of their allegiances, it will continue.

# 9 of 9
September 3, 2010 05:02 (EDT)
Roby Mitchell MD
Amen brother. Sickness has become a thriving industry.

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About Dr Melissa Walton-Shirley
Dr Walton-Shirley performs invasive cardiology, nuclear cardiology, and stress echocardiography in a private practice in Glasgow, KY.

Her chief medical interests are CHF/hypertrophic obstructive cardiomyopathy and the promotion of primary PCI for acute MI. Recently she played a significant role in helping to launch an ambitious pilot study of primary PCI in Kentucky, the Kentucky Primary Angioplasty Pilot Project. She has also participated in the TIMI 19, Duke-HF, NRMI, and CRUSADE trials and is proud to have been an advocate of the first smoke-free initiative in Kentucky (2011). She champions a smoke-free America.

Dr Walton-Shirley received her undergraduate degree at the University of Kentucky and went to medical school and did her residency and fellowship at the University of Louisville. She is married with two daughters. Her interests include singing, writing poetry and songs, fitness, and, of course, theheart.org.