Aging may not impact your testosterone levels as much as you might think. From age about 35, studies suggest circulating levels of this sex hormone in men usually begin to decline. But it’s only very gradual. There’s another overlooked factor that could have bigger impact: where fat is stored in body.
According to new analysis, published in Journal of the Endocrine Society, visceral fat, or deep fat in abdomen, may be more precise metabolic determinant of testosterone suppression. This specific type of fatty tissue can wrap around vital organs like liver, stomach, and intestines, and it has many receptors for testosterone, making it especially sensitive to circulating hormone.
Deep Belly Fat Suppresses Testosterone More Than Age: 5,000 Men Analysis
In review of health data from nearly 5,000 men in US, aged 20 to 59, presence of visceral fat was strongly associated with testosterone suppression. In fact, in this age bracket, it seemed to influence testosterone concentrations significantly more than chronological aging. After accounting for fat distribution, age showed only modest associations within study’s age range.
Two review authors, research physiologists Karl Friedl and Adam Potter, of US Army Research Institute of Environmental Medicine, conclude deep belly fat should be “primary adiposity correlate of low testosterone in US men“.
Previous research similarly found among middle-aged men, fat-related measures exert greater influence on testosterone levels than age. For instance, 2007 study of 1,667 men found gaining 4 to 5 body mass index points was linked to decline in testosterone. This decline was comparable to roughly 10 years of aging. Such results also broadly align with research from 2013, which tracked 1,382 men over course of five years.
Study authors concluded age-related declines in T levels are “not inevitable”, but instead are explained by smoking behavior and health status, particularly obesity and depression.
Why BMI and Waist Circumference Miss Hidden Risk
Today, BMI and waist circumference remain most common measures of excess body weight, but they aren’t necessarily best measures of cardiometabolic health.
While obesity is largely consistent with lower testosterone levels, men with similar BMIs and waist circumferences can still demonstrate substantially different levels of this hormone.
It’s possible, for instance, that young man with BMI in healthy weight range has high percentage of hidden visceral fat, and this may be impacting testosterone levels.
By contrast, older, muscular man with lower visceral fat could be deemed to have higher risk of testosterone issues just because of age and BMI score. In cases like these, visceral fat levels may be more important consideration. It’s unclear why testosterone production is so closely linked to visceral fat, but researchers have few ideas. Deep fat in abdomen can promote insulin resistance, and this may cause downstream impact on how certain cells in testes convert cholesterol to testosterone.
Visceral fat can also stimulate inflammatory pathways that could disrupt body’s hormone signaling pathway, increasing conversion of testosterone to estradiol.
“Current guidelines appropriately recognize obesity as risk factor for low testosterone, but our findings suggest adipose distribution, particularly visceral adiposity, may provide additional information beyond total body mass alone,” explain Friedl and Potter.
Analysis: Targeting Visceral Fat May Fix Low Testosterone Better Than TRT
This means interventions that reduce visceral fat, including drugs like Ozempic or Wegovy, may address issues of low testosterone more directly than testosterone replacement therapy alone. “These observations underscore importance of characterizing underlying adiposity phenotype and considering reversible metabolic contributors before initiating testosterone therapy,” study authors conclude.
In simple terms, losing deep belly fat may restore testosterone more naturally than adding external testosterone. Therefore, lifestyle, diet, exercise, and medical weight loss options deserve consideration first.
Q&A
Q: Does aging lower testosterone more than belly fat?
A: No, analysis of nearly 5,000 men 20-59 found visceral fat suppresses testosterone significantly more than chronological aging after accounting for fat distribution.
Q: What type of fat lowers testosterone most?
A: Visceral fat, deep fat wrapping around liver, stomach, and intestines with many testosterone receptors, is primary adiposity correlate of low testosterone.
Q: Can reducing belly fat increase testosterone without TRT?
A: Researchers suggest interventions reducing visceral fat, including lifestyle and drugs like Ozempic/Wegovy, may address low testosterone more directly than testosterone replacement therapy alone.
FAQ
1. Where was visceral fat testosterone study published?
Analysis published in Journal of the Endocrine Society by Karl Friedl and Adam Potter from US Army Research Institute of Environmental Medicine.
2. How many men were studied?
Health data from nearly 5,000 US men aged 20-59 were reviewed for association between visceral fat distribution and testosterone levels.
3. Is age-related testosterone decline inevitable?
No, 2013 study of 1,382 men found decline not inevitable, but explained by smoking, obesity, and depression; 2007 study found 4-5 BMI gain equals 10 years aging effect.
4. Why is BMI flawed for testosterone risk assessment?
Men with same BMI and waist can have different visceral fat levels; young man with healthy BMI but high hidden visceral fat may have low testosterone.
5. How does visceral fat lower testosterone?
It promotes insulin resistance affecting cholesterol conversion in testes and stimulates inflammation increasing conversion of testosterone to estradiol.
Disclaimer; This article is for informational purposes only and does not constitute medical advice. Always consult qualified healthcare professionals or endocrinologists before considering weight loss drugs like Ozempic/Wegovy or testosterone replacement therapy. Do not start or stop treatment based on this article.
