There are plenty of reasons to quit smoking. The health effects of smoking are well known and well documented, not just on your fertility, but a whole number of health issues including heart disease and cancer. Now, there's yet another reason to quit smoking if you are pregnant or trying to get pregnant. Cigarettes may actually affect a woman's male offspring's sperm quality. As reported in Human Reproduction, the male offspring of pregnant mice exposed to high levels of cigarette smoke had sperm with lower counts, lower motility and more abnormally shaped sperm (low morphology), and these male mice took longer longer to impregnate female mice who in turn gave birth to fewer mouse pups. So, what does this all mean? While we don't yet know if this is true in humans (or even 100 % sure it is true in animals), exposure to tobacco smoke could not only harm your fertility (among other things) but also could harm your unborn son's chances of fathering children. This is another good reason to quit.
A recent study suggests that men who keeps their cellphones in their pants pockets, may have lower sperm motility. Researchers at the University of Exeter in the UK, found that men who kept cell phones in their pockets had lower sperm motility than those who did not, about an 8% reduction. Is this an issue? It remains to be seen whether this decrease really affects a couple's chances for pregnancy and truly causes infertility.
Patients are always asking me are there dietary changes they can make to enhance their chances for pregnancy. In the case of men with low sperm counts, the answer is often no. However, researchers from Harvard School of Public Health looked at men's diet and the quality of their sperm in a study presented at the American Society for Reproductive Medicine (ASRM) meeting. Interestingly, they found that men who consumed lots of processed meats such as bacon and sausage had poorer quality sperm and those who consumed lots of dark meat fish such as salmon and tuna had better quality sperm. While these findings are preliminary; the study size is small and the data has not been published yet, this does suggest that nutrition may play a real role in male infertility.