Hormones and men’s health: The key hormones that affect performance and aging

Men’s hormone health is not just about testosterone. Persistent symptoms are a reason to look at the wider male hormone picture, including LH, FSH, cortisol related stress patterns, insulin, estradiol, and thyroid markers.

Key takeaways

• Male hypogonadism is not diagnosed by one low number alone. It requires persistent symptoms plus consistently low testosterone on repeat morning testing.^[1]
• In a JAMA sleep study, 1 week of sleeping 5 hours a night lowered daytime testosterone by 10% to 15% in young healthy men.^[2]
• The Massachusetts Male Aging Study followed the same men over 7 to 10 years.^[3] Total testosterone fell about 1.6% per year and bioavailable testosterone about 2% to 3% per year.^[3]
• The TRAVERSE trial followed 5,246 men for a mean of 33 months and found testosterone therapy was noninferior to placebo for major cardiovascular events.^[4] Testosterone therapy is still not recommended for men planning fertility in the near term.^[1]
• Low testosterone with low or normal LH points to secondary hypogonadism, a problem with brain signaling.^[5] Low testosterone with high LH points to primary testicular failure.

Why hormones and men’s health are inseparable

Hormones help regulate energy, muscle maintenance, libido, sleep, mood, blood sugar control, and recovery. In men, testosterone gets most of the attention, but it works inside a larger network. That network includes LH and FSH from the pituitary, cortisol from the adrenal glands, insulin from the pancreas, thyroid hormones, and DHEA. Testosterone is also the raw material for estradiol, which the aromatase enzyme makes from it, and blocking that conversion changes body fat and sexual function in men.^[6]

According to the Endocrine Society guideline, male hypogonadism is a clinical syndrome that requires both symptoms and consistently low testosterone, not either one by itself.^[1] A 2010 New England Journal of Medicine study from the European Male Ageing Study surveyed 3,369 men aged 40 to 79.^[7] It found that the symptoms most clearly tied to low testosterone were sexual: poor morning erections, low sexual desire, and erectile dysfunction.^[7] In that cohort, late-onset hypogonadism was defined by at least three of those symptoms together with total testosterone below 11 nmol/L (about 320 ng/dL) and free testosterone below 220 pmol/L (about 64 pg/mL).^[7]

Sleep and metabolic health also affect this system. A 2011 JAMA study found that 1 week of sleeping only 5 hours per night lowered daytime testosterone by 10% to 15% in a small group of healthy young men.^[2] Because the study was small and lasted only a week, it does not show what happens over months or years.

How the male hormone network works

Male hormone health runs through a brain to testes signaling loop. Cortisol, insulin, thyroid, and estradiol pathways can amplify or blunt testosterone’s effects.

Testosterone and the HPG axis

The HPG axis is the hypothalamic pituitary gonadal axis, the feedback loop between the brain and testes that governs testosterone production. LH tells Leydig cells in the testes to make testosterone, and FSH supports sperm production. Low testosterone with low or normal LH and FSH is the pattern of secondary, or hypogonadotropic, hypogonadism. That is why these hormones are measured alongside testosterone to separate primary from secondary causes.^[5] Once deficiency is confirmed, the Endocrine Society guideline recommends further evaluation to find the cause.^[1]

The same guideline recommends a fasting morning total testosterone, measured with an accurate and reliable assay, as the first test, repeated to confirm a low result.^[1] Total testosterone may be near the lower limit of normal, or a condition may alter SHBG. In those cases it recommends measuring free testosterone by equilibrium dialysis or estimating it with an accurate formula.^[1]

Cortisol and stress timing

Cortisol is the main stress hormone made by the adrenal glands. It normally follows a daily rhythm that peaks in the morning and falls at night. Short bursts help mobilize glucose and keep you alert; the concern is sustained activation. A 2005 review in Psychoneuroendocrinology described how stress that exceeds a threshold activates brain pathways that drive the adrenals to release glucocorticoids such as cortisol.^[8] The review linked this activity to the metabolic syndrome, the clustering of obesity, high blood pressure, glucose intolerance, and abnormal blood lipids.^[8]

Insulin, body fat, and aromatase

Insulin moves glucose out of the blood and into cells. In men, low testosterone is associated with impaired glucose control, reduced insulin sensitivity, and unfavorable blood lipids.^[9]

Aromatase, the enzyme that converts testosterone to estradiol, is active in fat tissue. According to a 2015 review in Obesity Reviews, testosterone and obesity affect each other in both directions, a pattern the authors describe as the hypogonadal-obesity cycle.^[9]

Thyroid, DHEA, and estradiol in men

Thyroid hormones set the body’s metabolic rate. Low thyroid function can cause fatigue, slower thinking, and weight gain that overlap with low testosterone symptoms. DHEA, an adrenal androgen precursor, declined with age in the Massachusetts Male Aging Study, along with cortisol and testosterone.^[3]

Estradiol also matters in men. A 2013 New England Journal of Medicine trial gave 400 healthy men aged 20 to 50 a drug that shut down their own hormone production.^[6] It then replaced testosterone at different doses, with or without anastrozole to block estradiol production.^[6] Low testosterone accounted for losses of lean mass, muscle size, and strength, and low estradiol mainly accounted for the rise in body fat. Both contributed to declining sexual function.^[6]

Health problems linked to male hormone imbalance

Male hormone imbalance is linked to obesity, type 2 diabetes, sexual dysfunction, and fertility problems during testosterone therapy. It is also linked to the strength and bone losses that often show up with aging.

Age related decline. The Massachusetts Male Aging Study followed men aged 40 to 70 at baseline for 7 to 10 years.^[3] Within the same men, total testosterone fell by about 1.6% per year and bioavailable testosterone by about 2% to 3% per year, while SHBG rose with age.^[3] That does not mean every tired 52 year old man has hypogonadism. Still, SHBG changes with age, so total testosterone alone can understate how much unbound testosterone has fallen.

Obesity and metabolic dysfunction. Low testosterone in men is associated with more central fat and less lean mass, and losing weight can raise testosterone.^[9] A 2006 JAMA meta-analysis of 43 studies found that men with type 2 diabetes had testosterone about 77 ng/dL lower than men without it.^[10] In prospective studies, men with higher testosterone had a 42% lower risk of developing type 2 diabetes.^[10]

Sexual symptoms. In the European Male Ageing Study, poor morning erections, low sexual desire, and erectile dysfunction were the only symptoms with a syndromic link to low testosterone in aging men.^[7] The Testosterone Trials enrolled 790 men aged 65 or older with low testosterone and symptoms.^[11] Those who used testosterone gel for 1 year had moderate improvements in sexual activity, sexual desire, and erectile function, and slightly better mood. They saw no benefit in vitality or walking distance.^[11] Evidence is therefore weaker for treating nonspecific complaints such as low energy alone. Erection problems also depend on blood flow, diabetes, medications, sleep, and stress, so testosterone is not a fix for every case.

Fertility during testosterone therapy. Testosterone taken as treatment suppresses the brain’s LH and FSH signals. That lowers testosterone inside the testes and can sharply reduce sperm production. For that reason, the Endocrine Society guideline recommends against starting testosterone therapy in men planning fertility in the near term.^[1] A man who wants children may feel better on testosterone yet move farther from that goal.

Symptoms and signals to notice

Men’s hormone problems usually show up first as repeatable patterns, not one dramatic symptom. None of these signs is specific on its own.

• You still get through the workday, but you need caffeine by 10 a.m., another hit at 2 p.m., and you feel “fried but awake” at bedtime.
• Your waist keeps expanding even though your body weight is only up 5 to 10 pounds, and most of that gain sits around the abdomen.
• Your workouts look the same on paper, but your strength stalls, soreness lasts 48 hours or more, and recovery feels slower than it did a year ago.
• You used to wake with regular morning erections, and now they are clearly less frequent over several weeks or months.
• You want sex less often, or the interest is still there but erections are less reliable, especially during stressful stretches.
• You sleep 6 hours or less most nights, wake around 3 a.m. to 4 a.m., or feel exhausted on waking even after a full night in bed.
• You notice more irritability, lower patience, and a shorter fuse at home, especially when combined with poor sleep and sugar cravings.
• You feel mentally slower in meetings, lose the thread of conversations, or find routine planning harder even though you are not sick.
• You are trying to conceive, but you are on or considering testosterone therapy without understanding that it can suppress sperm production.
• You have low testosterone symptoms with total testosterone in the low normal range, a situation in which the Endocrine Society recommends measuring free testosterone.^[1]

Myth vs fact

Myth: Only testosterone matters

Fact: Testosterone is central, but men’s hormone health also depends on LH, FSH, cortisol, insulin, thyroid hormones, and estradiol. In human studies, sleep loss lowered testosterone, low testosterone was tied to obesity, and low estradiol raised body fat.^{[2] [6] [9]}

Myth: One low lab value means hypogonadism

Fact: According to the Endocrine Society guideline, the diagnosis requires symptoms plus consistently low testosterone on repeat morning testing.^[1] LH and FSH are needed to find the cause. High LH with low testosterone points to primary hypogonadism, while low or normal LH with low testosterone points to secondary hypogonadism.^[5]

Myth: TRT is the best first treatment for every man

Fact: Testosterone therapy is meant for documented hypogonadism, and the Endocrine Society guideline recommends against starting it in men planning fertility in the near term.^[1] In secondary hypogonadism the testes are intact. There, treatments that raise the body’s own LH and FSH, such as enclomiphene, are an option aimed at keeping sperm production going and preserving fertility potential.

Myth: Stress does not change male hormones

Fact: A 2011 JAMA study found that 1 week of 5 hour sleep nights reduced daytime testosterone by 10% to 15% in healthy young men.^[2] Stress driven cortisol release has also been linked to the metabolic syndrome, including obesity and glucose intolerance.^[8]

Myth: Estradiol is irrelevant in men

Fact: Men need estradiol for body fat regulation and sexual function. In a New England Journal of Medicine trial, low estradiol mainly accounted for increased body fat in men and contributed to declining sexual function.^[6]

What to do if your hormones feel off

The next step is a structured workup that matches treatment to the source of the problem.

1. Track the pattern. For 2 to 4 weeks, note sleep hours, alcohol intake, waist change, libido, morning erections, gym recovery, energy crashes, and medications. Also note whether symptoms worsened after weight gain, a stressful period, or a new prescription.
2. Get the right labs at the right time. The Endocrine Society guideline recommends a fasting morning total testosterone, repeated to confirm a low result.^[1] It adds free testosterone when total testosterone is borderline or SHBG may be altered.^[1] LH and FSH belong in the same draw because they show whether the problem starts in the testes or the brain. Depending on symptoms, age, and history, clinicians may also check estradiol, a blood count, a metabolic panel, PSA, prolactin, or thyroid function.
3. Match treatment to the mechanism. High LH with low testosterone means primary hypogonadism, where the testes are not responding and testosterone therapy may be required. Low or normal LH with low testosterone suggests secondary hypogonadism. It may be functional, linked to obesity, diabetes, or medications, or it may need evaluation for pituitary or hypothalamic causes.^[5] Medication review, prolactin testing, thyroid testing, and pituitary evaluation are needed when clinically indicated before treatment is chosen. Enclomiphene is an oral drug that blocks estrogen signaling at the hypothalamus. That raises GnRH and LH, so the testes make more of their own testosterone. It does not work in primary hypogonadism, where the testes cannot respond.

Veedma offers testing that includes total and free testosterone measured by LC-MS/MS with LH and FSH, or a review of labs you already have. Licensed providers can treat with enclomiphene or the enclomiphene plus tadalafil tablet when appropriate, with ongoing monitoring. Enclomiphene is not an FDA-approved drug; it is prescribed after a provider confirms the diagnosis and is compounded by a licensed U.S. pharmacy.

Bottom line

Performance, libido, body composition, sleep, and aging depend on a network of hormones, not one number. Testosterone matters, but a careful workup also looks at LH, FSH, cortisol related stress patterns, insulin, estradiol, and thyroid function. It also asks whether the problem is primary, secondary, or functional. A diagnosis of hypogonadism needs both persistent symptoms and consistently low testosterone.^[1]

References

1. Bhasin S, Brito JP, Cunningham GR, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103:1715-1744. PMID: 29562364
2. Leproult R, Van Cauter E. Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA. 2011;305:2173-4. PMID: 21632481
3. Feldman HA, Longcope C, Derby CA, et al. Age trends in the level of serum testosterone and other hormones in middle-aged men: longitudinal results from the Massachusetts male aging study. J Clin Endocrinol Metab. 2002;87:589-98. PMID: 11836290
4. Lincoff AM, Bhasin S, Flevaris P, et al. Cardiovascular Safety of Testosterone-Replacement Therapy. N Engl J Med. 2023;389:107-117. PMID: 37326322
5. Ascoli P, Cavagnini F. Hypopituitarism. Pituitary. 2006;9:335-42. PMID: 17077946
6. Finkelstein JS, Lee H, Burnett-Bowie SA, et al. Gonadal steroids and body composition, strength, and sexual function in men. N Engl J Med. 2013;369:1011-22. PMID: 24024838
7. Wu FC, Tajar A, Beynon JM, et al. Identification of late-onset hypogonadism in middle-aged and elderly men. N Engl J Med. 2010;363:123-35. PMID: 20554979
8. Rosmond R. Role of stress in the pathogenesis of the metabolic syndrome. Psychoneuroendocrinology. 2005;30:1-10. PMID: 15358437
9. Kelly DM, Jones TH. Testosterone and obesity. Obes Rev. 2015;16:581-606. PMID: 25982085
10. Ding EL, Song Y, Malik VS, et al. Sex differences of endogenous sex hormones and risk of type 2 diabetes: a systematic review and meta-analysis. JAMA. 2006;295:1288-99. PMID: 16537739
11. Snyder PJ, Bhasin S, Cunningham GR, et al. Effects of Testosterone Treatment in Older Men. N Engl J Med. 2016;374:611-24. PMID: 26886521