<s>[INST] Can obesity affect my fertility? [/INST] There are conditions associated with obesity in both men and women that can interfere with their chances of conceiving (either naturally or by means of assisted reproductive techniques) and with the normal evolution of pregnancy.Some women suffer hormonal imbalances that affect their menstrual cycles, interfere with ovulation and cause infertility. Obesity is closely related to polycystic ovary syndrome, a condition in which the ovaries do not produce enough hormones and so the egg neither reaches maturity nor is released (anovulation), thus giving rise to infertility.

In the case of men, obesity can reduce both the quantity of sperm and their activity with functional and morphological alterations. 
The good news is that losing weight (through dieting or bariatric surgery) significantly improves the chances of conceiving and having a healthy pregnancy.Recommendations are to avoid becoming pregnant for at least 1 year after bariatric surgery, as the health of the foetus is largely dependent on the mother’s nutritional status and the possibility of nutritional deficiencies are a significant source of risk for maternal and foetal wellbeing. Source: Clinic Barcelona. Link: https://www.clinicbarcelona.org/en/assistance/diseases/obesity/frequent-asked-questions. Field: Endocrinology. Disease: Obesity </s>