Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleA new study indicates that the average testosterone levels in men may have decreased by over 50 per cent in the last five decades, confirming a significant ongoing male fertility crisis. The research, a review of six long-term studies, analysed data from nearly 118,600 men across five countries between 1972 and 2019, revealing a consistent decline in testosterone levels. Scientists found an average reduction rate of 54 per cent since 1979, with the pace of decline notably accelerating after 2000, representing approximately a one per cent drop each year. Major contributing factors identified include obesity and diabetes, where obesity converts testosterone into oestrogen, and diabetes impairs the brain's ability to signal testosterone production. Environmental factors, such as hormone-disrupting substances found in household products like "forever chemicals," are also suspected to be contributing to this widespread decline. In fullMen’s testosterone levels have fallen by half in last 50 years, scientists warnMore bulletinsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in
How male testosterone levels halved in 50 years
Stay up to date with notifications from The IndependentNotifications can be managed in browser preferences.AllNewsSportCultureLifestyleA new study indicates that the average testosterone levels in men may have decreased by over 50 per cent in the last five decades, confirming a significant ongoing male fertility crisis. The research, a review of six long-term studies, analysed data from nearly 118,600 men across five countries between 1972 and 2019, revealing a consistent decline in testosterone levels. Scientists found an average reduction rate of 54 per cent since 1979, with the pace of decline notably accelerating after 2000, representing approximately a one per cent drop each year. Major contributing factors identified include obesity and diabetes, where obesity converts testosterone into oestrogen, and diabetes impairs the brain's ability to signal testosterone production. Environmental factors, such as hormone-disrupting substances found in household products like "forever chemicals," are also suspected to be contributing to this widespread decline. In fullMen’s testosterone levels have fallen by half in last 50 years, scientists warnMore bulletinsThank you for registeringPlease refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in
