Human reproduction (Oxford, England)2026n = 1482
CohortHuman
This study looked at whether eating ultra-processed food around the time of conception affects fertility and early embryo development in couples. It followed 831 women and 651 men from before…
Human reproduction (Oxford, England)2026n = 1,220
CohortHuman
Researchers followed 1,220 men at a Utah fertility clinic and matched the outdoor heat and humidity each man lived through while his sperm were forming against a molecular measure of…
Reproductive biology and endocrinology : RB&E2026n = 1,316 men (434 inactive, 430 low-activity, 452 moderate-activity)
CohortHuman
This study looked at whether the intensity of physical activity affects semen quality in men who already have impaired sperm health. It followed over 1,300 men undergoing fertility evaluations, each…
Environmental pollution (Barking, Essex : 1987)2026n = 4,847 semen examinations
CohortHuman
This study set out to examine how exposure to fine particulate air pollution (PM2.5) and its components affects semen quality, and whether living near green spaces might help protect against…
PloS one2026n = 221
CohortHuman
This study set out to understand how lifestyle factors relate to semen abnormalities in men undergoing fertility evaluation in Ghana. It analyzed medical records of 221 men at a Ghanaian…
Frontiers in public health2026n = 5,114
CohortHuman
This study measured how outdoor temperature tracks with semen quality, using records from 5,114 men attending a reproductive medicine centre in Wenzhou, on China's east coast. The measure it used…
Reproductive biology and endocrinology : RB&E2026n = 15,581 men (10,670 in Denmark, 4,911 in Florida)
CohortHuman
This study set out to see if sperm quality changes with the seasons in Denmark and Florida, and whether outdoor temperatures play a role. It looked at semen samples from…
Frontiers in endocrinology2025n = 2,672 semen samples
CohortHuman
This study asked whether the pandemic changed how sensitive sperm production is to weather. It took 2,672 semen analyses from 1,287 Korean men collected between 2018 and 2024 and matched…