Health claim
“Men with a body mass index (BMI) over 30 have, on average, 15% lower sperm concentration than men with a BMI under 25.”
Claim checked — strong evidenceLow riskother
Evidence Summary
Multiple well-designed studies consistently support this claim.
Multiple epidemiological studies have found that men with BMI ≥ 30 have roughly a 10‑20% lower sperm concentration compared with men with BMI < 25, aligning with the claimed 15% reduction.
Extracted from
Why Male Fertility Is Declining Drastically | Dr. Shanna Swan & Dr. Andrew HubermanHuberman Lab Clips
Dr. Shanna Swan and Dr. Andrew Huberman discuss the documented decline in male sperm counts, its potential health implications, and factors that may influence fertility.
Watch breakdown →