Opinion: The latest flip-flop on red meat uses best science in place of best guesses (via latimesopinion)
The answer is that many of the nation’s official nutrition recommendations — including the idea that red meat is a killer — have been based on a type of weak science that experts have unfortunately become accustomed to relying upon. Now that iffy science is being questioned.
Remember that the original reason we’ve distrusted red meat is that starting in 1961, the American Heart Assn. told us to limit our consumption of saturated fat to prevent heart disease. However, recent decades have seen a reconsideration of this topic. A recentin the journal BMJ Evidence-Based Medicine consolidates 17 separate reviews showing these fats, whether from meat, cheese or coconut oil, have no effect on mortality.
The odd exception has occurred when epidemiology tips the scales in a big way, as it did with tobacco. Heavy smokers were found to have a nine to 25-fold increased risk for cancer compared with never-smokers, a difference so big that causation could be implied. Yet in nutrition epidemiology, the differing rates rarely exceed 1.5-fold, which most epidemiologists outside of nutrition consider to be non-findings.
The nutrition establishment went ballistic. Even before publication of the Annals papers, 14 heavyweights in the field signed a letter demanding a preemptive “retraction” of the review. All the signers were members of a group called the True Health Initiative that advocates for a plant-based diet. Many of them recommend plant-based diets in their research papers, which rely heavily on epidemiology. Some are financially conflicted.
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