Journal
LABORATORY ANIMALS
Volume 41, Issue 1, Pages 1-18Publisher
SAGE PUBLICATIONS INC
DOI: 10.1258/002367707779399428
Keywords
phytoestrogens; isoflavones; laboratory rodent diets; animal models
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Phytoestrogens are a diverse group of plant-derived compounds structurally or functionally mimicking mammalian oestrogens. A variety of effects, in vitro, in animal models and in humans, have been attributed to these compounds. It is generally not appreciated that many commercial rodent diets are formulated with soy as a source of protein and thus large daily doses of phytoestrogens in the form of isoflavones are delivered to the animals. The content of isoflavones in laboratory diets depends on a number of factors and, therefore, varies considerably, both between different formulations, and also from batch to batch of the same formulation. Dietary isoflavones can influence a number of different endpoints, rendering the dietary levels of such compounds an important experimental factor to consider. The levels of isoflavones in common laboratory diets are reviewed in relation to the dietary levels influencing different endpoints.
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