Infertility & Obesity Facts

Why do people experiencing infertility need to consider their weight?

Consider the facts: 

  • Obese women have reduced reproductive hormones
    • Weight loss increases production of reproductive hormones
    • 5-10 percent weight loss by obese women increases ovulation and pregnancy rates
  • Obesity reduces a man’s sperm quality and quantity
  • Obese couples have a further decrease in fertility
  • Obese women take almost 20 percent more time achieving pregnancy than women in an optimal weight range
  • A 25-year-old woman with a normal body mass index (BMI) has up to 70 percent clinical pregnancy rate with IVF, while a 25-year-old woman with a BMI of 40 has a 30 percent clinical pregnancy rate.
  • Obese women who undergo donor sperm insemination take longer to conceive
  • In the US, 31 percent of the population older than 15 has a BMI greater than 30—considerably more than any other country (see the chart below).

Global Obesity: Percentage of obesity by country.