Hagai Levine, the lead researcher on the study, said the findings left him feeling "very worried. Other male fertility experts say the study helps confirm what has been suspected for some time. Schisterman was not involved in the study. People will probably have plenty of theories as to why this is happening — perhaps because of herbicides, pesticides, or oestrogens in the water from so many women being on the pill. Disclaimer All content within this column is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. Avner Hershlag, chief of fertility at Northwell Health in New York, said the medical community may focus on genetics, environmental hazards, or even global warming to try and find a reason for the decline. The decrease has been linked to exposure to chemicals in pesticides and plastics, obesity, smoking, stress, tight underpants or even too much TV-watching.
185 studies reveal men's sperm count has plunged worldwide over the last 40 years
Original article on Live Science. Scientists determine sperm count by looking at a sample of ejaculate under a microscope. Sonya Lunder, a senior analyst at the nonprofit advocacy group Environmental Working Group, noted that sperm is manufactured daily by men's bodies. According to Levine, sperm count, in particular, has been previously associated with lifestyle factors such as obesity, smoking and stress. Other researchers have also questioned the validity of historical sperm count estimates, claiming older studies were unreliable due to inaccurate measuring techniques.
Men's Sperm Counts are Dropping Worldwide: Study | Time
As the keratin cells push out of the matrix, they become hard, flat and compact, eventually forming the hard surface of the nail known as the nail plate. The same could not be said for men in the "Other" group, whose sperm count appeared to experience no significant change. The analysis included information on fertility status, age, ejaculation abstinence time, semen collection method, sperm count method and geographic location at the level of continent. But they don't always grow at the same speed: Starting with the participants, studies of the sperm count of the average man are supposed to preclude men with fertility problems. Meta-regression models were also developed to account for variable factors such as age, abstinence and selection of the study population.
The study was published in Human Reproduction Update. For the paper, published this week in the journal Human Reproduction Update , researchers examined studies conducted between and , including data on sperm counts from nearly 43, men. While we're not anywhere near a fertility disaster in the realm of The Handmaid's Tale , any new developments are still worth keeping an eye on in the future. Headlines about a looming male infertility crisis have peppered the landscape in the past few months, thanks to a July study that found the sperm counts of men in North America, Europe and Australia to be on the decline. But what could be triggering this decline in sperm?