In a report published by the British Society of infertility (British Fertility Society), scientists have suggested doctors refuse to carry out in vitro fertilization patients with extreme degrees of obesity. The experts suggested that no allow for the artificial insemination of women with body mass index of more than 36 units. Women with a body mass index greater than 29 units, in vitro fertilization offers only be performed after weight normalization. At the time of instruction given the British National Health Service recommended that doctors warn women who are overweight and obesity on the risk posed by pregnancy for their health, but did not deny them the treatment of infertility. Overweight upon the occurrence of pregnancy greatly increases the likelihood of developing gestational diabetes and hypertension. Currently, British insurance companies refuse to make the procedure in the treatment of infertility insurance policy if the client is obese. With the representative of British society on the problems of infertility, Richard Kennedy, the practice of some offices of the National System of Health for a long time do not spend vitro fertilization patients with obesity. The report also contained recommendations not to deny the artificial insemination for single women and lesbian couples..