Fact: While some men can father children into their 50’s or 60’s, male fertility isn’t age-proof. Men see a decline in fertility in their 40s, and also have been found to be at increased risk of offspring with certain health conditions, like schizophrenia.
Fact: Poor nutrition can have an impact on fertility. Women with a Body Mass Index (BMI) over 30 or those who are severely underweight may have difficulties with fertility. Click here to download a BMI reference chart.
Fact: Smoking marijuana, even infrequently, can dramatically affect sperm and egg quality, which can have a dramatic impact on fertility.
Infertility Myth #9: Vasectomy reversals are rarely successful.
Fact: It’s common for people to think of infertility as a female problem, but only 35% of infertility cases are caused solely by female factors. Another 35% results from factors in the male reproductive system, 20% come from both, and 10% are undetermined.
Fact: According to Resolve, more than 5 million Americans of childbearing age have fertility problems. Even under the best circumstances, conception is tricky. It’s not unusual for a perfectly healthy, fertile couple to try for several months or more before achieving a pregnancy. However, if you are 35 years or younger and have been trying to conceive for one year or more (or if you are over 35 and have been trying for 6 months or more) consultation with a fertility doctor is recommended.
Fact: Alcohol can increase the risk of birth defects once a woman becomes pregnant and can cause a collection of birth defects known as fetal alcohol syndrome (FAS). There is no known “safe” amount of alcohol that can be consumed during pregnancy, so it is generally recommended that women avoid alcohol in pregnancy.
Fact: Researchers at the University of New York at Stony Brook put this piece of conventional wisdom to the test and concluded that underwear style is unlikely to significantly affect a man’s fertility.
Despite the relaxation effects that many people associate with marijuana use, research has shown marijuana has negative effects on the male sexual response.
Quitting marijuana can be harder than many long-term marijuana users expect, so you and your partner would be wise to quit as soon as possible, while you still have time to get help before getting pregnant. If either or both parents still use marijuana when the baby arrives, you are increasing the risk that your child may use drugs in the future, and parental drug use is implicated in many difficulties for children and families.
Obviously, if you are both smoking marijuana, you risk increasing the chances of infertility as a couple.
Steven Gans, MD is board-certified in psychiatry and is an active supervisor, teacher, and mentor at Massachusetts General Hospital.
Although the link between marijuana and fertility is not straightforward—plenty of marijuana smokers get pregnant and get their partners pregnant—some research has demonstrated that marijuana use can negatively impact you, your partner, or the fertility of both of you.
Research suggests that marijuana can negatively affect female fertility in the following ways:
Furthermore, the effects of marijuana on fertility seem to accumulate over time. This means that although teenage girls who smoke marijuana are more likely to get pregnant, by the time a chronic marijuana smoking woman is in her mid-twenties, she may be more likely to experience a delay in getting pregnant.
Female reproductive health is vastly complex in itself, as it not only comprises the ability to become pregnant but also the ability to carry healthy offspring to term and successfully give birth.
Other studies seen as providing evidence that cannabis use can cause foetal abnormalities are animal studies (Geber & Schramm 1969, Phillipset al, 1971) in which rabbits, hamsters, rats and mice were injected with vast doses of crude cannabis extract (as much as 666mg/kg in one instance!). Such massive doses of cannabis would be practically impossible for a human to consume through conventional means, and are essentially useless as a point of comparison.
In a 1994 study, it was found that mammalian sperm, including that of humans, is actually incapable of fertilizing oocytes (eggs) immediately after leaving the testes. It requires a period of exposure to certain crucial hormones, enzymes and proteins on its journey through the vas deferens and ejaculatory ducts of the male reproductive system (as well as the reproductive fluids of the female vagina and oviducts) before becoming “capacitated” and able to fertilize an egg.
Male Cannabis Plants: 7 Things to do With Males
Although THC and anandamide are both agonists of the CB1-receptors, they greatly differ in structure and therefore have different effects on certain metabolic processes. Anandamide has a much shorter half-life than THC (just a few minutes for anandamide compared to as long as 24 hours for THC). So while anandamide will degrade shortly after it contacts a receptor, THC can remain in nearby adipose tissue for much longer periods, and can continue to stimulate the receptors, ultimately causing overstimulation and potential negative effects.
Another study in 1992 (Vescovi et al.) found that levels of luteinizing hormone(LH), an important pituitary gland hormone involved in reproductive function, were reduced in male chronic cannabis users compared to a non-cannabis-using, age-matched control group. A previous 1986 study (Cone et al.) also found a significant reduction in LH levels immediately after smoking cannabis.
Some studies on the effect of cannabis use on male fertility have indicated that regular use may reduce spermatogenesis (the production of sperm in the testes) and testosterone levels.
And an even earlier study (Kolodny et al, 1974) into testosterone levels in “chronic” cannabis users found that 6 of 17 subjects had oligospermia (low sperm count), and that average testosterone levels in the cannabis-using group were just over half that of the control group. The effect of cannabis on testosterone levels was observed to be dose-dependent.