In order to get a better understanding of these effects, researchers from the Inserm cardiovascular, metabolism, diabetology and nutrition unit (U1060 Laboratoire de recherche en cardiovasculaire, mtabolisme, diabtologie et nutrition Inserm/Inra/Universit Lyon 1) introduced a "cocktail" of contaminants mixed with low doses of dioxin, PCB, bisphenol A and phtalates into the feeding of mice that had already been rendered obese by a high-fat diet.
The results show that metabolic changes occur in these mice, but that the effects differ depending on the gender. Females appeared to be more affected. Their obesity-induced glucose intolerance worsened and their estrogen pathway was altered.
These works have been published in the review Faseb Journal.
Obesity is a major public health problem because it is a risk factor in the development of metabolic complications (diabetes, cardiovascular diseases, etc.). It is a multi-factorial disorder. In addition to genetic predispositions and a life style that combines overeating with lack of exercise, there is a great volume of proof to suggest that contaminants, particularly in the food we eat, are responsible for the obesity epidemic and the resulting metabolic changes.
Researchers have put forward the hypothesis that contaminants in food could worsen certain metabolic problems already caused by eating an over-rich or a high-fat diet.
In this study, the researchers fed mice a high-fat diet (already a health risk), to which low doses of contaminants had been added. They were given this diet throughout their lives. Their mother had been nourished with this diet prior to their birth and during the gestation and lactation periods. Therefore, they suffered chronic exposure to this diet.
Two environmentally persistent contaminants (dioxin and PCB) and two non-persistent contaminants (phtalate and bisphenol A) were added to the high-fat (obesogenic) diet of the mice. The doses g
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INSERM (Institut national de la sant et de la recherche mdicale)