- Researchers say physique fats measurements are a greater predictor of male reproductive well being than physique mass index readings.
- They report that males with larger physique fats percentages have decrease sperm counts than males with decrease physique fats measurements.
- Males can probably enhance their reproductive well being by sustaining a wholesome physique weight, consuming a well-balanced weight-reduction plan, and minimizing stress.
Physique fats share generally is a higher predictor of male reproductive well being than physique mass index (BMI), based on a brand new examine.
Researchers report that larger physique fats percentages are related to lower sperm counts and modifications in male reproductive hormones, together with testosterone.
They mentioned these associations persist even amongst males with regular BMI however larger body fat percentage.
The researchers famous that males with a excessive physique fats share typically had decrease sperm counts than males with a traditional physique fats share. They added that the males with excessive physique fats percentages additionally tended to have decrease semen quantity and sperm focus.
They concluded that physique fats share was a greater predictor of diminished sperm depend than BMI or waist-to-height ratio. The researchers additionally reported that even males with a traditional BMI however a comparatively excessive physique fats share had decrease sperm counts and poorly fashioned sperm.
“[Our research] means that measuring body fat share could establish males susceptible to impaired reproductive well being who wouldn’t be recognized primarily based on BMI alone,” mentioned Nis Brix, MD, an affiliate professor within the Division of Public Well being at Aarhus College in Denmark and first writer of the examine, in a statement.
The researchers are additionally concerned in one other examine, the BIOSFER project, which is inspecting the organic and social determinants of low fertility. They’re accumulating data on reproductive well being, together with semen samples, in 1,250 Danish males and 1,250 Norwegian males as a part of this bigger analysis mission.
Philip Werthman, MD, a urologist, males’s well being specialist, and director of the Middle for Male Reproductive Medication and Vasectomy Reversal in Los Angeles, mentioned male fertility has turn out to be an more and more essential matter. Wethman wasn’t concerned with the examine.
“The decline in male fertility is actual and important,” he advised Healthline. “[It’s] not a refined shift. It’s a significant public well being sign.”
The researchers famous that previous studies have proven that weight problems and different weight administration points are related to impaired reproductive well being in males, together with worse semen high quality and diminished fertility.
Nonetheless, the researchers famous that BMI is simply an oblique measure of fatty tissues and doesn’t distinguish between fats mass and lean body mass, which may embody muscle mass. Because of this, the researchers mentioned that males with the identical BMI can have markedly completely different physique fats ranges.
For his or her examine, the researchers studied 1,058 Danish males who had simply turned 18 years and 9 months of age.
They measured the participant’s physique fats share utilizing a bioimpedance analyzer, which sends a weak electrical present by the physique with the voltage being measured to estimate physique fats, physique water, and muscle mass.
Physique fats share was divided into 4 classes: low (lower than 8% fats), regular (8-19%), excessive (20-24%), and really excessive (25% or extra).
As well as, the researchers measured the members BMI and waist-to-height ratio. The boys additionally supplied semen and blood samples, measured the scale of their testicles, and accomplished a questionnaire on well being conduct.
The researchers reported that, in comparison with males with a traditional physique fats share, their evaluation indicated that males with a excessive physique fats share had, on common, a 23% decrease sperm depend.
The researchers mentioned males with very excessive physique fats percentages had a 15% decrease sperm depend than males with a traditional physique fats share.
The researchers reported that males within the larger physique fats classes additionally had decrease intercourse hormone-binding globulin (SHBG) and testosterone levels, in addition to altered balances of male reproductive hormones.
“For males, sustaining a wholesome body composition, not only a wholesome body weight for top, could also be essential for fertility,” Brix mentioned. “For medical doctors, assessing physique fats share in chosen sufferers may assist establish males susceptible to diminished fertility who would possibly in any other case be ignored primarily based on BMI alone.”
“Extra broadly, the outcomes spotlight the significance of stopping excess body fat by wholesome life-style initiatives, which can profit each reproductive well being and total well being,” Brix added.
Werthman mentioned that obesity generally is a main contributing think about male infertility.
“Weight problems alone performs a significant position as extra fats tissue converts testosterone into estrogen and straight impairs sperm production,” he defined. “It can be crucial we acknowledge that trendy life is actively working towards male reproductive well being.”
Werthman added it’s essential for males to acquire a semen analysis if there are any indicators of fertility points.
“You can not optimize what you haven’t measured,” he mentioned. “It’s cheap, non-invasive, and gives crucial perception into depend, motility, and morphology.”
S. Adam Ramin, MD, a urologist, urologic oncologist, and medical director of Urology Most cancers Specialists in Los Angeles, wasn’t concerned within the examine however mentioned the findings present precious data.
“It presents good causes as to why a lower in sperm depend happens as physique fats will increase,” he mentioned.
Ramin famous that reproductive well being points might also point out different well being issues. “A low sperm depend could also be a sign of one thing extra critical occurring contained in the physique,” he advised Healthline.
It’s estimated that infertility impacts about
Nonetheless, a 2025 study concluded that sperm focus stays secure amongst males in america with no identified fertility challenges. That’s in distinction to
Male infertility is often linked to sexual perform in addition to semen high quality. These circumstances can embody:
- decreased sperm count, motility, or high quality
- decreased libido, or intercourse drive
- erectile dysfunction
- low ranges of hormones equivalent to testosterone and prolactin
The risk factors for male infertility, particularly low sperm depend, embody:
- weight problems
- harm or surgical procedure to the testicles
- sexually transmitted infections (STIs)
- publicity to pesticides, herbicides, or industrial chemical substances
- publicity to radiation
- extreme drug use or alcohol consumption
- anabolic steroid use
Infertility can’t all the time be handled, however there are ways for males to enhance their reproductive well being. Among the many methods:
- exercising usually
- making an attempt antioxidant supplements, particularly vitamin C
- minimizing stress
- consuming a well-balanced weight-reduction plan
- sustaining a wholesome physique weight
- getting constant, high quality sleep
- quitting smoking
- limiting alcohol consumption
Ramin provides that testicles want unobstructed blood move to perform correctly, so carrying loose-fitting pants can assist circulation to that a part of the physique.
He additionally famous that testicles are typically about 2 levels cooler than the remainder of the physique, so sitting for prolonged lengths of time in heat water, equivalent to in a jacuzzi, could have an effect on sperm high quality.
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