Commentary: Should you eat meat, or are you confounded by methodological debate?

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Abstract
The non-meat eaters were volunteers, mainly recruited through advertisements and word of mouth in an organisation that promotes vegetarianism. Such volunteers will differ greatly from the general population, not only in age and sex, but also in education, social class, and other aspects of lifestyle. To counter these obvious objections the authors asked the non-meat eaters to recruit friends or relatives as controls. These people ate meat more regularly but belonged to the same social strata and might also have shared other habits.

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