The research on excess weight in men and its reach into hormones, fertility, and metabolic health.
This study looked at whether obesity speeds up the decline in sperm quality that has been seen over time. Researchers reviewed semen tests from 2,430 men with normal sperm counts…
This meta-analysis (a study that statistically pools many earlier studies) looked at how body mass index (BMI, a weight-for-height number used to flag over- or under-weight) relates to sperm quality…
This study looked at how different types of exercise affect body composition during weight loss. It compared resistance training, aerobic exercise, and no exercise in 304 adults on a calorie-restricted…
This review gathers recent evidence on what damages male fertility and how much of it can be undone. Smoking raises sperm DNA fragmentation (breaks in the genetic material inside sperm)…