The use of four cups of coffee in day interferes with conception of the child. To such conclusion the Dutch scientists by results of research with participation of nine thousand women, before resorting to procedure of an extracorporal fertilization have come, the newspaper informs Bea Lintsen and its colleagues from University Radboud in Nimeng observed of the women, within 13 years after last procedure. It was found out, that for this period at 1350 women children conceived natural by were born (Buy viagra). The analysis of a way of life and food allowance of participants has shown, that the use of four and more cups of coffee, strong tea or other drinks with caffeine reduced probability of conception on 26 %. About the same effect rendered the use of alcoholic drinks three times a week. Even more essential negative role was played by excess weight of the woman, and also smoking, researchers have informed. For example, at the 36-year-old woman with superfluous in the weight, the smoker using four cups of coffee in day and alcohol three times a week risk to conceive the child natural by it is peer 5 %. At normal weight and absence of three other risk factors at the same woman, its chances to become pregnant make 15 %, has noted Lintsen. Thus, change of a way of life allows to treble chances of a birth of the child at sterility, scientists have underlined. The report on results of research has been presented at annual conference of the European society of a reproduction of the person and the fetology which have passed in Barcelona.