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Men’s average testosterone levels have halved in last 50 years, say scientists

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Mens average testosterone levels have halved in last 50 years, say scientists

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Average testosterone levels in men fell by 54% between 1972 and 2019, according to findings presented at the annual meeting of the European Society of Human Reproduction and Embryology in London. The meta-analysis drew on data from 118,593 men across Israel, the U.S., Brazil, Finland and Denmark.

Average testosterone levels in men fell by 54% between 1972 and 2019, according to findings presented at the annual meeting of the European Society of Human Reproduction and Embryology in London. The meta-analysis drew on data from 118,593 men across Israel, the U.S., Brazil, Finland and Denmark.

The research, led by Prof. Hagai Levine of the Hebrew University-Hadassah Braun School of Public Health in Israel, found testosterone declined by more than 1% per year across six longitudinal studies, with the rate of decline appearing to accelerate after 2000.

The research, led by Prof. Hagai Levine of the Hebrew University-Hadassah Braun School of Public Health in Israel, found testosterone declined by more than 1% per year across six longitudinal studies, with the rate of decline appearing to accelerate after 2000.

Rising obesity and diabetes are identified as major contributors to declining testosterone, as excess body fat converts testosterone into estrogen while insulin resistance impairs signals from the brain that trigger testosterone production.

Spital Clinic

Rising obesity and diabetes are identified as major contributors to declining testosterone, as excess body fat converts testosterone into estrogen while insulin resistance impairs signals from the brain that trigger testosterone production.

A separate study using U.S. National Health and Nutrition Examination Survey data found that mean total testosterone levels in adolescent and young adult males aged 15 to 39 declined consistently between 1999 and 2016, with elevated body mass index associated with lower levels.

A separate study using U.S. National Health and Nutrition Examination Survey data found that mean total testosterone levels in adolescent and young adult males aged 15 to 39 declined consistently between 1999 and 2016, with elevated body mass index associated with lower levels.

A University of Manchester study using data from 6,758 sperm donor applicants at Cryos International in Denmark found no significant change in average sperm concentration between 2017 and 2022, though the concentration and total number of motile sperm declined by 16% and 22% respectively from 2019 to 2022.

A University of Manchester study using data from 6,758 sperm donor applicants at Cryos International in Denmark found no significant change in average sperm concentration between 2017 and 2022, though the concentration and total number of motile sperm declined by 16% and 22% respectively from 2019 to 2022.

Experts have raised concerns about the rise in testosterone supplement use, warning that administering testosterone can suppress the body's natural sperm production. UK testosterone prescriptions rose 135% between 2021 and 2024, driven in part by direct-to-consumer men's health companies marketing via social media.

Experts have raised concerns about the rise in testosterone supplement use, warning that administering testosterone can suppress the body's natural sperm production. UK testosterone prescriptions rose 135% between 2021 and 2024, driven in part by direct-to-consumer men's health companies marketing via social media.

Men’s average testosterone levels have halved in last 50 years, say scientists

Men’s average testosterone levels have halved in last 50 years, say scientists

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