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  1. TheBigBadWolf

    Cannabis use changes the size and shape of sperm, potentially affecting male fertility.
    The world's largest study on sperm shape and size has identified cannabis as a major predictor of sperm abnormality.

    Season and frequency of sexual activity were also major lifestyle factors affecting sperm but, surprisingly, cigarette and alcohol consumption had little effect.

    The study included a sample of sperm from almost 2,000 men across the UK. The lifestyles of men with less than 4% normal sperm (defined as sperm with a typical shape and size) were compared against men with sperm samples with greater than 4% normality.

    The University of Sheffield reported in a press release, "Men who produced ejaculates with less than 4% normal sperm were nearly twice as likely to have produced the sample in the summer months, or if they were younger than 30 years old, to have used cannabis in the three month period prior to ejaculation."

    The researchers advise that men aiming to start a family should probably stop using cannabis as previous research has shown that good sperm morphology is crucial to successful conception.

    The research was published in the journal Human Reproduction last week.
    Felicity Nelson
    Friday, 06 June 2014
    picture by Gabriel Sancho

    Source: http://sciencealert.com.au


    Also read :https://www.drugs-forum.com/forum/showthread.php?p=1477018#post1477018


  1. methadon
    Makes sense lol. Been smoking cannabis since I was 15 (27 now).

    Banged plenty of chicks and never got one knocked up!

    Looks like I'll have to quit if I want a kid. Oh well. Hahaha.
  2. TheBigBadWolf
    Sperm size and shape in young men affected by cannabis use

    [imgl=white]https://www.drugs-forum.com/forum/attachment.php?attachmentid=39056&stc=1&d=1402076412[/imgl]Young men who use cannabis may be putting their fertility at risk by inadvertently affecting the size and shape of their sperm according to research published yesterday (Thursday 5 June 2014).

    In the world’s largest study to investigate how common lifestyle factors influence the size and shape of sperm (referred to as sperm morphology), a research team from the Universities of Sheffield and Manchester also found that sperm size and shape was worse in samples ejaculated in the summer months but was better in men who had abstained from sexual activity for more than six days.
    However, other common lifestyle factors reported by men, including smoking cigarettes or drinking alcohol, appeared to have little effect.
    The study, published in the medical journal Human Reproduction, recruited 2,249 men from 14 fertility clinics around the UK1 and asked them to fill out detailed questionnaires about their medical history and their lifestyle.
    Reliable data about sperm morphology was only available for 1,970 men and so the researchers compared the information collected for 318 men who produced sperm of which less than four per cent was the correct size and shape and a control group of 1,652 men where this was above four per cent and therefore considered ‘normal’ by current medical definitions.
    Men who produced ejaculates with less than four percent normal sperm were nearly twice as likely to have produced a sample in the summer months (June to August), or if they were younger than 30 years old, to have used cannabis in the three month period prior to ejaculation2.
    Lead author Dr Allan Pacey, Senior Lecturer in Andrology at the University of Sheffield, said: “Our knowledge of factors that influence sperm size and shape is very limited, yet faced with a diagnosis of poor sperm morphology, many men are concerned to try and identify any factors in their lifestyle that could be causing this.
    "It is therefore reassuring to find that there are very few identifiable risks, although our data suggests that cannabis users might be advised to stop using the drug if they are planning to try and start a family.”
    Previous research has suggested that only sperm with good sperm morphology are able to pass into the woman’s body following sex and make their way to the egg and fertilise it. Studies in the laboratory also suggest that sperm with poor morphology also swim less well because their abnormal shape makes them less efficient.
    Dr Andrew Povey, from the University of Manchester’s Institute of Population Health, said: “This research builds on our study of two years ago3 which looked at the risk factors associated with the number of swimming sperm (motile concentration) in men’s ejaculates.
    “This previous study also found that there were relatively few risk factors that men could change in order to improve their fertility. We therefore have to conclude again that there is little evidence that delaying fertility treatment to make adjustments to a man’s lifestyle will improve their chances of a conception.”
    Although the study failed to find any association between sperm morphology and other common lifestyle factors, such as cigarette smoking or alcohol consumption, it remains possible that they could correlate with other aspects of sperm that were not measured, such as the quality of the DNA contained in the sperm head.
    Professor Nicola Cherry, originally from the University of Manchester but now at the University of Alberta, commented on a recent companion paper published by the group in the Journal of Occupational and Environmental Medicine4: “In addition to cannabis exposure shown in this paper, we also know that men exposed to paint strippers and lead are also at risk of having sperm with poor morphology.”
    The study, funded by the UK Health and Safety Executive, the UK Department of Environment, Transport and the Regions, the UK Department of Health and the European Chemical Industry Council, follows on from the team’s previous research which showed that men who worked with organic solvents, particularly glycol ethers, were more likely to ejaculate lower numbers of swimming sperm5.

    The paper, ‘Modified and non-modifiable risk factors for poor sperm morphology’ by AA Pacey et al, will be published in the journal Human Reproduction, at 00:05 (BST) on Thursday 5 June 2014.
    1 Participating centres were: Department of Obstetrics and Gynaecology, Queens University, Belfast; Assisted Conception Unit, Birmingham Women’s Hospital; Division of Obstetrics and Gynaecology, St Michael’s Hospital, Bristol; Directorate of Women’s Health, Southmead Hospital, Bristol; Cardiff Assisted Reproduction Unit, University of Wales; MRC Reproductive Biology Unit, Edinburgh; Reproductive Medicine Unit, Liverpool Women’s Hospital; St Bartholomew’s Hospital, London; Department of Obstetrics and Gynaecology, Royal Free and University College, London; Department of Reproductive Medicine, St Mary’s Hospital, Manchester; IVF/Immunology Laboratory, Salford Royal Hospital Department of Histopathology, University hospital of South Manchester; International Centre for Life, Newcastle; Department of Obstetrics and Gynaecology, Jessop Hospital for Women, Sheffield; Shropshire and Mid-Wales Fertility Centre, Royal Shrewsbury NHS Trust.
    2 The study found that risk factors for poor sperm morphology, after adjustment for centre and other risk factors, included: (i) sample production in summer (odds ratio (OR) = 1.99, 95% confidence interval (CI) 1.43 - 2.72); and (ii) use of cannabis in the 3 months prior to sample collection in men aged ≤30 years (OR = 1.94, 95%CI 1.05 – 3.60). Men who produced a sample after 6 days abstinence were less likely to be a case (OR = 0.64, 95%CI 0.43 - 0.95). No significant association was found with BMI, type of underwear, smoking or alcohol consumption, or having a history of mumps.
    3 See Povey et al., (2012) Modifiable and non-modifiable risk factors for poor semen quality: a case-referent study. Hum Reprod 17:2799-2806.
    4 See Cherry et al., (2014) Occupational exposures and sperm morphology: a case referent analysis of a multi-centre study. Occup Environ Med. First published on 20th May 2014 as 10.1136/oemed-2013-101996
    5 See Cherry et al., (2008) Occupation and male infertility: glycol ethers and other exposures. Occup Environ Med. 65: 708-714.


    Also see:

  3. prescriptionperil
    All it takes is one of those lititle buggers (sperm) to make a baby. Ejaculation produces an abundance of sperm.Sometimes what's true in the lab turns out untrue in the real world. From my anecdotal evidence I've known plenty of fertile post thirty pot smokers. Of course, if conception's not occurring then it can't hurt to abstain.

    Methadon, what you likely got is lucky.
  4. prescriptionperil
    My bad, this involved actual men. Did they ask them whether they wore briefs or boxers, as briefs increase infertility.

    This is good news for me cause i hate kids. I wonder how opiates and such affect fertility cause i take tons of those
  6. Booty love
    Well....i have been smoking cannabis almost everyday for the last 7 years and in that time i have had a 5 year old and 22 month old twins.
  7. kumar420
    Doesn't phase me in the least. Don't plan on kids anytime soon, and if I do I'm not going to worry about lopsided swimmers. And damn, this is like the greatest news ever for younger weed smoking males- who wants a baby between 16 and 25 anyway. Although a few assholes make take it as a sign that they don't need protection
  8. backinjurydrugs
    It doesn't surprise me a bit that weed changes sperm. I know it definitely changes the taste. Kumar, I hope too many guys don't take it as a sign not to use protection..STD's will be running like crazy.
  9. storkfmny
    They will make the bay stupid as fuck.
  10. methadon
    I can tell you for a fact, opiates lower you're testosterone levels, Fertility, Sperm count.. ALL of that.

    Doesn't mean you won't have a kid, but the chances are way less. Add some mary jane to the combo and you'll be sterile like you take birth control. Seriously though! I should have had a few kids by now, but wasn't ready anyways. (Only good thing that came with using opiates and herbals lol). Now that I'm sober uhhhohhh. Might have triplets!!! :0
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