Stress in Pregnancy May Impact Son’s Fertility Later in Life

A new study, published in the journal Human Reproduction, found that men whose mothers experience stressful events early in pregnancy are more likely to have reduced sperm counts and lower testosterone levels when they become adults.

The study, by researchers at the University of Western Australia, surveyed 2,804 women during different stages in their pregnancies between May 1989 and …

Men Have Biological Clocks Too

A new study, published in the journal Maturitas, indicates that older men have decreased fertility and may put their partners at increased risk for pregnancy complications.  Their children may also be at higher risk for developing certain medical conditions later in life.

Researchers at Rutgers University reviewed 40 years of research on the effect of paternal age on fertility, …

Being Underweight May Impact Male Fertility

A new study, published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology, shows that being underweight may have a detrimental impact on male fertility.

Several prior studies have shown that being overweight can impact male fertility, but this study shows that being underweight might be worse.  Men with a body mass index (BMI) …

Does Marijuana Use Impair Fertility?

A recent study, in the Journal of Epidemiology and Community Health, found that marijuana use, by either men or women, does not seem to impair their ability to conceive a child.

Researchers form Boston University’s School of Public Health conducted a web-based prospective cohort study of North American couples living in the United States and Canada.  The study surveyed women …

Do Boxers or Briefs Matter?

A new study published in the journal Human Reproduction found that men who wear loose fitting underwear have better sperm counts and motility compared to men who wear tight fitting underwear.

Researchers from Harvard looked at the semen analyses of 656 male partners of couples seeking fertility treatment.   The men were all between 32 and 39 years old.  The type …

Moderate Alcohol Consumption May Improve Male Fertility

The question about whether or not alcohol consumption affects male fertility is difficult to answer because the medical literature in this area has been mixed.  A new study from Italy, published in the journal Andrology, is suggesting that a moderate amount of alcohol by men may actually boost male fertility.

The study looked at the semen analyses of 323 …

Marijuana Use Does Not Delay Conception

A bulletin from the American Society for Reproductive Medicine (ASRM) highlights a study reported in the journal Ferility and Sterility that for reproductive-age men and women in the United States trying to conceive, marijuana use, or frequency of use, is not associated with a longer time to pregnancy (TTP). Researchers retrospectively reviewed data from the National Survey of Family Growth …

Obesity Can Hurt Male Fertility

A new study by researchers in India is showing that obesity can hurt male fertility.  Researchers at a fertility center in India analyzed sperm samples from over 1200 men and found that men who were obese (body mass index greater than 30) had lower semen volumes, lower sperm counts, lower sperm motility, and a higher percentage of abnormally shaped sperm.  …

Quiet bedroom= stronger sperm

Last week Dr Amin blogged here that a new analysis published in the journal, Human Reproduction Update, is showing that the sperm counts of men in North America, Europe, Australia, and New Zealand have markedly declined in the past 40 years.

If you or your partner has a marginal sperm count, here is something simple that could make a …

Caffeine May Affect Male Fertility

A new study is showing that excessive caffeine intake may affect male fertility.  The study by Italian researchers, published in Nutrition Journal, showed that increased caffeine intake may affect male reproductive function, possibly through sperm DNA damage.

The study compiled data from approximately 20,000 males involved in 28 previous research studies that looked at the relationship between male coffee/caffeine …