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နောက်ဆုံး ပြင်ဆင်သည် စက်တင်ဘာ 3, 2026

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For decades, doctors viewed low testosterone through a fairly narrow lens — low libido, fatigue, erectile dysfunction, and brain fog. If a man’s lab numbers came back low, we simply reached for a syringe or a tube of gel. But medicine, at its best, refuses to stand still. A quiet revolution is reshaping how we understand men’s hormones, and it points to one powerful idea: testosterone is no longer just a sex hormone — it is a barometer of a man’s entire metabolic health.

At the American Urological Association (AUA) 2026 meeting in Washington, DC, while shadowing Professor Mohit Khera — a global leader in men’s health from Baylor College of Medicine — I attended a course on modern hormone therapy that felt less like a lecture and more like watching a paradigm shift unfold in real time. Here’s what every man should understand about this new way of thinking.

The Vicious Cycle: How Belly Fat and Low Testosterone Feed Each Other

Picture a middle-aged man carrying excess weight, with type 2 diabetes, high blood pressure, and confirmed low testosterone. Historically, his care would be fragmented — one doctor for his blood sugar, another for his blood pressure, and maybe a urologist eventually for his low testosterone. But these problems do not exist in isolation. In fact, obesity and low testosterone are locked in a destructive, self-reinforcing cycle.

Here is how it works: belly fat (visceral fat) contains an enzyme that actively converts testosterone into estrogen. As testosterone drops, the body loses its ability to build lean muscle and burn energy efficiently — which leads to more fat accumulation. That extra fat then converts even more testosterone away, and the cycle deepens. Over time, this metabolic decay harms the heart and accelerates the gradual loss of muscle that comes with aging. The direction of cause and effect here is genuinely two-way, which is why weight loss itself raises testosterone in many men — and why the gym is often recommended before the pharmacy.

The Problem with Weight-Loss Injections Alone

In recent years, the new generation of weight-loss medications — the GLP-1 drugs like semaglutide and tirzepatide — has transformed how we treat obesity. They are remarkably powerful at driving weight loss. But as we look closer, a hidden vulnerability has emerged: significant muscle loss.

When someone loses a lot of weight rapidly on these medications alone, a meaningful share of that lost weight can come from precious muscle rather than fat. For an older man who already has low testosterone, this is a double blow. The scale shows a lighter number, but underneath, he is actually weaker, his metabolism has slowed, and his hormone deficiency remains completely unaddressed. You can win the battle on the scale and still lose the war on your health.

Combining Weight-Loss Medication with Testosterone — and Who Prescribes What

This is where the elegant solution comes in. The idea presented at the conference was a clinical partnership: pair the fat-burning, appetite-suppressing power of GLP-1 medications with the muscle-preserving effect of testosterone therapy — all supported by resistance training and a high-protein diet.

The results of this combined approach in the cases presented were striking. Over the course of a year, a patient following this multi-pronged plan lost a dramatic amount of weight — but almost all of it came from fat, with his muscle largely preserved, and his diabetes, cholesterol and blood pressure all improved. Worth keeping in proportion: these were selected reported cases rather than a large randomised trial, so the approach is promising rather than proven.

One practical point, because patients understandably ask. These are two different prescriptions from two different specialties, and I want to be clear about which is mine. I do not prescribe GLP-1 medications. Weight-loss pharmacotherapy sits with the endocrine and metabolic teams at Bangkok Hospital Headquarters, and a referral can be arranged. What I look after is the hormonal side — confirming whether testosterone is genuinely low on morning blood tests taken more than once, deciding whether treatment is appropriate, and monitoring it safely thereafter. The combination described above works because those two clinicians talk to each other, not because one person does both.

What Testosterone Therapy Asks of You in Return

An article about the upside owes you the other half. Testosterone is not a supplement, and the monitoring is not optional:

• Haematocrit — the proportion of your blood made up of red cells. Testosterone raises it, and this is the number that most often forces a dose change, because thicker blood matters for clotting risk.
• Fertility — testosterone from outside switches off the brain signal that drives sperm production, and in many men on treatment the sperm count falls to zero. It usually recovers after stopping, over months rather than weeks, and not in every man. If children are a possibility, say so before starting: other ways of raising testosterone exist that do not suppress sperm production.
• PSA and the prostate — followed before and during treatment.
• Sleep apnoea that has not been treated can worsen, and some men notice breast tenderness or enlargement.

And a short list that is not for the next appointment. Chest pain, sudden breathlessness, pain or swelling in one calf, or a sudden severe headache with weakness or difficulty speaking are emergencies — go to hospital and tell the team you are on testosterone.

The Big Question: Testosterone After Prostate Cancer

No discussion of testosterone is complete without addressing the elephant in the room: prostate cancer. A second expert presented a nuanced case of a man who had been treated for localized prostate cancer with surgery, and afterward was suffering severely from low testosterone — fatigue, erectile dysfunction, bone loss, and poor quality of life — yet his cancer markers were undetectable.

How do you safely help a man like this? The session highlighted the approach modern urologists use: careful baseline testing, thorough informed consent, and ongoing monitoring of cancer markers, with the decision made together with the team looking after his cancer rather than by a urologist alone.

Stimulating the Body’s Own Testosterone

For some men, rather than giving testosterone directly, doctors can use a medication (clomiphene) that encourages the body to make more of its own. A useful clinical pearl shared at the session: a simple blood test for a hormone called LH acts as the gatekeeper for whether this approach will work. If that hormone is low, the man is usually a good candidate — his testicles are capable but just need a stronger signal from the brain. If it is already high, the brain is already shouting the signal and the testicles cannot respond, so this medication will not help.

In the case presented, the man initially responded well. But over time his symptoms returned despite the treatment — a well-known phenomenon where the body gradually stops responding to a medication. Because testosterone gels carry a real risk of transferring to family members through skin contact, his team switched him to low-dose injections, fine-tuning the dose over the following years.

What the Safety Data Does — and Does Not — Show

Here is the more reassuring part, stated carefully. Real-world and registry studies of men treated for localized prostate cancer have မဟုတ် shown a higher rate of recurrence in those who went on to receive testosterone therapy. The old blanket prohibition has not held up.

What that evidence is not, however, is a randomised trial. These are observational studies of men selected by their doctors as suitable — treated cancer, undetectable markers, no sign of residual disease — and the reassurance extends only as far as men who look like them. It is not a green light for testosterone during active surveillance, in untreated cancer, or where markers are rising, and any man in this position needs the conversation to include the team managing his cancer. The longer version of this argument, including the saturation model that explains why the old fear was overstated, is set out in a new perspective on testosterone and prostate cancer.

In the case presented, the team continued his testosterone therapy under close monitoring for several years, and he lived those years feeling well rather than depleted. When his markers eventually rose to a level signalling a true need for further treatment, he moved on to the appropriate next step. That is the honest shape of the decision: not risk-free, but a trade-off made with open eyes and close follow-up.

Bringing This Modern Thinking Home to Thailand

My time at AUA 2026 was a powerful reminder of why we must keep pursuing international medical innovation rather than staying stuck in the concepts of the past. When you walk into my clinic at Bangkok Hospital Headquarters, we do not look at your testosterone as an isolated number on a lab report. We look at the bigger picture — your body composition, your muscle mass, your heart and metabolic health, and your long-term safety — and where part of that picture belongs to another specialty, we bring that specialty in rather than improvising.

You can see how that assessment is structured on the testosterone therapy service page, and the fertility, prostate and heart questions are covered in more depth in testosterone therapy today.

To explore a comprehensive evaluation of your hormone and metabolic health, Dr. Soarawee Weerasopone consults at ဘန်ကောက်ဆေးရုံ