The Trump administration is warning the public about a growing national security threat: “Low T.”
Low tanks? Low tomahawks? Low thermonuclear warheads?
No. Low testosterone.
And the timing of the Pentagon’s warnings about the increasing problem is ironic.
Just days after former President Barack Obama mocked War Secretary Pete Hegseth for worrying about the testosterone levels of American troops, a senior Trump administration health official is explaining why the issue is no laughing matter.
"There is absolutely national defense readiness ramifications for [low testosterone]," Adm. Brian Christine, a senior Department of Health and Human Services official, told Fox News.
Christine, a urologist with more than 35 years of experience in men's health, said declining testosterone is part of a much larger problem involving the physical condition of America's military-age population.
According to Christine, approximately 77 percent of Americans ages 17 to 24 do not qualify for military service without a waiver.
Among young men, more than 70 percent are ineligible, while only about three percent of young Americans express interest in serving.
Those figures reflect a range of problems, including obesity, chronic disease and other medical or behavioral barriers. But testosterone deficiency has become another concern.
"I think it's incredibly important, incredibly timely," Christine said of the Pentagon's new screening initiative.
In September, the Department of War issued guidelines requiring male service members ages 30 and older to undergo screening for testosterone deficiency, beginning with an assessment of symptoms and risk factors.
Further blood testing and treatment are available when medically appropriate.
"We're not forcing testosterone on anybody," Christine explained. "But what we are doing is screening, taking those men who are symptomatic and have low numbers and offering them a pathway forward."
The initiative is part of Hegseth's broader effort to improve military fitness, physical standards and combat readiness.
And there is substantial research suggesting that something unusual is happening to American men's hormonal health.
A 2021 study published in European Urology Focus examined testosterone measurements from more than 4,000 American males ages 15 to 39.
Researchers found that average testosterone levels declined between 1999 and 2016, even after accounting for several factors, including age and body mass index.
The average fell from approximately 605 nanograms per deciliter in 1999–2000 to 451 in 2015–2016. That's a decline of roughly 25 percent.
And the researchers found that the downward trend persisted even among men with normal body weight. So what's causing it?
The scientific evidence points to several possible contributing factors.
Obesity and metabolic disorders are strongly associated with low testosterone. Excess body fat can disrupt hormonal regulation, while insulin resistance and chronic inflammation may further interfere with normal testosterone production. Physical inactivity and poor sleep are also potential contributors.
Then there is growing concern about environmental exposures. Scientists are investigating whether chemicals found in plastics, pesticides and other everyday products may interfere with the body's endocrine system.
Christine specifically raised the possibility that microplastics and other environmental toxins could be contributing to declining testosterone levels.
National Institutes of Health Director Jay Bhattacharya acknowledged that researchers still do not have a complete explanation.
"It's interesting because if you look at the epidemiological trends, testosterone levels in the American male population have been declining over the last decades. And, again, we don't know why. We don't have an answer," Bhattacharya told Fox News.
He also identified declining sperm counts as another area requiring investigation.
"But even more importantly, what are the factors, probably environmental factors, that have led to the decline in sperm counts, for instance? We need an answer to those questions."
The NIH is investing in research to better understand these trends.
Meanwhile, Hegseth is approaching the issue from the perspective of military readiness.
The screening program is intended to identify genuine hormonal deficiencies, not artificially enhance soldiers' physical capabilities. A clinical diagnosis requires symptoms and consistently low testosterone measurements, rather than a single abnormal test result.
And that brings us back to Obama. As RedState reported Saturday, the former president mocked Hegseth during a campaign rally in Cleveland, Ohio.
"Meanwhile, you've got the defense secretary who's squarely focused on the jawlines and testosterone levels of our troops," Obama sneered.
"How much time do you think this Defense Secretary spends looking at himself in the mirror in the morning?"
OBAMA on IRAN WAR: Meanwhile, you've got the defense secretary who's squarely focused on the jawlines and testosterone levels of our troops. How much time do you think this Defense Secretary spends looking at himself in the mirror in the morning? https://t.co/n3IKX7k4Fg
— Acyn (@Acyn) October 24, 2026
But Hegseth's concern is hardly limited to appearances.
The Trump administration is confronting a military recruiting pool in which large numbers of young Americans are medically or physically unqualified to serve, while researchers are documenting a generational decline in an important marker of men's health. Christine emphasized that testosterone affects much more than muscle development.
"Testosterone levels in men are absolutely related to their overall well-being, to their lifespan, to their health span and to their wellness," he said.
His point was that restoring military readiness requires addressing the health of the people expected to defend the country.
While the former president is making cracks about Hegseth's vanity, the Trump administration is asking why American men are becoming less physically prepared for military service. That seems like a question worth taking more seriously.
