Final answer:
Approximately 50% of overweight and obese women experience menstrual irregularities contributing to increased subfertility. Obesity can lead to hormonal imbalances and conditions like PCOS, which affect fertility. Both female and male factors account for 30% each of infertility in couples.
Step-by-step explanation:
About 50% of overweight and obese women experience menstrual irregularities that might increase rates of subfertility. Being overweight or obese is associated with a range of health issues, including reproductive concerns like infertility. Obesity can cause hormonal imbalances and insulin resistance, which can disrupt the menstrual cycle and lead to conditions such as polycystic ovary syndrome (PCOS), increasing the difficulty in conceiving.
Factors such as age, lifestyle, and overall health significantly impact fertility. Female fertility peaks in the mid-twenties and starts to decline after age 30. Additionally, about 30 percent of infertility in couples is attributed to female factors and another 30 percent to male factors, with the remainder due to a combination of both or unknown causes.