A review of large-scale studies involving more than
1.5 million people found all-cause mortality is higher for those who eat meat,
particularly red or processed meat, on a daily basis. Conducted by physicians
from Mayo Clinic in Arizona, "Is Meat Killing Us?" was published
today in the Journal of the American Osteopathic Association.
The authors analyzed six studies that evaluated the
effects of meat and vegetarian diets on mortality with a goal of giving primary
care physicians evidence-based guidance about whether they should discourage
patients from eating meat. Their recommendation: physicians should advise
patients to limit animal products when possible and consume more plants than
meat.
"This data reinforces what we have known for so
long -- your diet has great potential to harm or heal," said Brookshield
Laurent, DO, assistant professor of family medicine and clinical sciences at
New York Institute of Technology College of Osteopathic Medicine. "This
clinical-based evidence can assist physicians in counseling patients about the
important role diet plays, leading to improved preventive care, a key
consideration in the osteopathic philosophy of medicine."
While findings for U.S. and European populations
differed somewhat, the data found the steepest rise in mortality at the
smallest increases of intake of total red meat. That 2014 study followed more
than one million people over 5.5 to 28 years and considered the association of
processed meat (such as bacon, sausage, salami, hot dogs and ham), as well as
unprocessed red meat (including uncured, unsalted beef, pork, lamb or game).
A 2014 meta-analysis examined associations with
mortality from cardiovascular disease and ischemic heart disease. In that study
of more than 1.5 million people, researchers found only processed meat
significantly increase the risk for all-cause mortality.
Combined, the findings of these studies are
statistically significant in their similarity, the reviewers noted. Further, a
2003 review of more than 500,000 participants found a decreased risk of 25
percent to nearly 50 percent of all-cause mortality for very low meat intake
compared with higher meat intake.
They also found a 3.6-year increase in life
expectancy for those on a vegetarian diet for more than 17 years, as compared
to short-term vegetarians.
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