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Even informed vegetarians won’t argue that virtually all plant foods contain no vitamin B12 and that meat and animal foods are the only significant dietary source of this crucial nutrient. Homocysteine concentrations in follicular fluid are associated with poor oocyte and embryo qualities in polycystic ovary syndrome patients undergoing assisted reproduction.
Additionally, we can’t synthesize B12 in our bodies.
As I have extensively pointed out, there is no credible fossil, archeological, anthropological or biochemical evidence to show that any hunter-gatherers or pre-agricultural humans ever consumed all plant based diets.
This information should be your first clue that there just may be some problems with vegetarian dietary recommendations created by humans for humans. “We are all human, we all make mistakes.” Let us not depend upon human frailties for dietary advice, but rather let us fall back on the wisdom of the system, again, evolution via natural selection, that designed the diet to which we are genetically adapted.
Key and colleagues at Oxford University conducted a large meta analysis comparing overall death rates between 27,808 vegetarians and 48,364 meat eaters.
There were no significant differences between vegetarians and non-vegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, lung cancer, breast cancer, prostate cancer or all other causes combined.
To start with, if vegetarian diets are so healthful, then any reasonable person might expect that people eating plant based diets would have lower death rates from all causes than their meat eating counterparts. The relationship between plasma homocysteine levels and bone mineral density in post-menopausal women.
This question was never fully answered until 1999 when Dr. Preventive zinc supplementation among infants, preschoolers, and older prepubertal children.
If we accept the idea that vegetarianism represents an ideal human diet, then this manner of eating must be part of a much larger or ultimate mechanism governing human biology. ” Why would a vegetarian diet, or for that matter, any diet represent an optimal nutritional road map for our species? this manner of eating has only been with us for the mere blink of an eye on an evolutionary timescale. Davey GK, Spencer EA, Appleby PN, Allen NE, Knox KH, Key TJ. In our comprehensive analysis of 229 hunter-gatherer diets, my research group and I showed beyond question that no historically studied foragers were vegetarians. EPIC-Oxford: lifestyle characteristics and nutrient intakes in a cohort of 33 883 meat-eaters and 31 546 non meat-eaters in the UK. In their 2009 Position Statement on Vegetarian Diets,…appropriately planned vegetarian diets, including total vegetarian or vegan diets are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain disease. Systematic butchery by Plio-Pleistocene hominids at Olduvai Gorge, Tanzania. Well-planned vegetarian diets are appropriate for individuals during all stages of the life cycle, including pregnancy, lactation, infancy, childhood, and adolescence, and for athletes.” I don’t know what planet the authors of this paper came from or what scientific journals they have been reading, but these statements simply are not supported by the data. Bucciarelli P, Martini G, Martinelli I, Ceccarelli E, Gennari L, Bader R, Valenti R, Franci B, Nuti R, Mannucci PM.