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Re-Analysis Refutes Diet Guidelines Favoring Vegetable Fats
Date:2/6/2013

By Alan Mozes
HealthDay Reporter

WEDNESDAY, Feb. 6 (HealthDay News) -- Enduring dietary wisdom -- that polyunsaturated vegetable fats are better for your heart than saturated animal fats -- may be turned on its head by a fresh analysis of a nearly 50-year-old study.

The reasoning has been that a diet rich in omega-6 polyunsaturated fats lowers cholesterol, and is therefore good for heart health. But an updated look at the study indicates that heart disease patients who follow this advice may actually increase their risk for death.

The original "Sydney Diet Heart Study," was initially conducted between 1966 and 1973, at a time when the cholesterol-lowering benefits of all polyunsaturated vegetable acids (PUFAs) were touted with a broad brush.

But in the ensuing years, researchers have come to understand that not all PUFAs are alike, with key biochemical differences -- and perhaps varying cardiovascular impacts -- observed among multiple types of omega-3s (found in fish oils) and omega-6 linoleic acids.

"There is more than one type of polyunsaturated fatty acid," explained Dr. Christopher Ramsden, who headed the re-analysis and is a clinical investigator with the laboratory of membrane biophysics and biochemistry at the National Institute on Alcohol Abuse and Alcoholism, part of the U.S. National Institutes of Health.

"And so, we were interested in trying to evaluate just one of these compounds, linoleic acid, by looking at this old trial using modern statistical methods, and also by re-including some original data that had gone missing from the first analysis," Ramsden explained.

The findings appeared online Feb. 5 in the BMJ.

The 458 male participants in the original study had been between the ages of 30 and 59 at enrollment, and all had a history of heart disease, with most having survived a heart attack.

The men were placed into two groups. The first group was told t
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