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- This latest study find that previous studies regarding the negative health effects of consuming red meat are not good enough to recommend how much an individual should consume or use to evaluate personal health risks.
This latest study has raised a storm of protests by health and nutritional experts and organizations. This study reviewed previous studies linking the consumption of red meat to the increase in risks for cardiovascular diseases, cancer. Their conclusion is that the data is not good enough to predict how one should modify or make recommendations on ones consumption of red meat .
Called into question is the method by which nutritional studies have been conducted. Select a population and determine their nutritional behavior by questionnaire and follow them for some extended period of time and monitor their health. There is no practical way to conduct a controlled double blind study which is the standard for most other medical studies. Except one was actually done. And the results are interesting.
In the late 60's early 70's Ivan Frantz a physician/professor at the University of Minnesota did a controlled double blind study using institutionalized individuals whose diet could be strictly controlled. The study was to determine the health risk of saturated fats. Ivan Frantz had always be interested in this subject to the extent that he even performed regular blood lipid/cholesterol monitoring of his children. The result of his study did not show any significant difference in life expectancy between a regular saturated fat diet and his low saturated fat diet although those on the low saturated fat diet had lower cholesterol. Note that the saturated fats were replace by vegetable oil. He tried reanalyzing it to no avail and because of the equivocal results he did not publish it until 15 years later but the conclusions stated were guarded so to speak and the study received little attention. Not too long ago another researcher was interested in the health effects of polyunsaturated fats, vegetable oil the recommended replacement for animal fats. This study noted the significant increase in the intake of Linoleic acid an Omega-6 fatty acid the main component of vegetable oil. This study in conjunction with Frantz's study determined there was not health benefit from vegetable oil. You can read a transcript of an interview of Dr. Frantz's son about his fathers work here
So what are we to think about this new study?
In each study, the scientists concluded that the links between eating red meat and disease and death were small, and the quality of the evidence was low to very low.
That is not to say that those links don’t exist. But they are mostly in studies that observe groups of people, a weak form of evidence. Even then, the health effects of red meat consumption are detectable only in the largest groups, the team concluded, and an individual cannot conclude that he or she will be better off not eating red meat.
Called into question is the method by which nutritional studies have been conducted. Select a population and determine their nutritional behavior by questionnaire and follow them for some extended period of time and monitor their health. There is no practical way to conduct a controlled double blind study which is the standard for most other medical studies. Except one was actually done. And the results are interesting.
In the late 60's early 70's Ivan Frantz a physician/professor at the University of Minnesota did a controlled double blind study using institutionalized individuals whose diet could be strictly controlled. The study was to determine the health risk of saturated fats. Ivan Frantz had always be interested in this subject to the extent that he even performed regular blood lipid/cholesterol monitoring of his children. The result of his study did not show any significant difference in life expectancy between a regular saturated fat diet and his low saturated fat diet although those on the low saturated fat diet had lower cholesterol. Note that the saturated fats were replace by vegetable oil. He tried reanalyzing it to no avail and because of the equivocal results he did not publish it until 15 years later but the conclusions stated were guarded so to speak and the study received little attention. Not too long ago another researcher was interested in the health effects of polyunsaturated fats, vegetable oil the recommended replacement for animal fats. This study noted the significant increase in the intake of Linoleic acid an Omega-6 fatty acid the main component of vegetable oil. This study in conjunction with Frantz's study determined there was not health benefit from vegetable oil. You can read a transcript of an interview of Dr. Frantz's son about his fathers work here
So what are we to think about this new study?
Perhaps there is no way to make policies that can be conveyed to the public and simultaneously communicate the breadth of scientific evidence concerning diet.
Or maybe, said Dr. Bier, policymakers should try something more straightforward: “When you don’t have the highest-quality evidence, the correct conclusion is ‘maybe.’”