01 Jun Why So Many Men Lose Energy After 40 – Understanding Andropause
by: Elena Klimenko, MD
Many men assume that feeling more tired, gaining weight around the middle, losing motivation, or noticing changes in their sex drive is simply part of getting older. But what if these changes point to something more specific — a gradual hormonal shift that can be understood and addressed?
Andropause, also known as late-onset hypogonadism (LOH), refers to the slow, age-related decline in testosterone and other androgens in men. Unlike the more sudden hormonal changes women experience in menopause, andropause unfolds gradually over years or decades, often going unrecognized. Understanding andropause symptoms can help men take proactive steps toward better energy, strength, mood, and overall vitality.
What Is Andropause?
Andropause describes the natural but progressive decline in testosterone levels that typically begins around age 30 at a rate of about 1% per year. While not every man develops noticeable symptoms, the likelihood increases with age and other health factors.
Research shows that up to 40% of men over 45 have low total testosterone levels, and symptomatic late-onset hypogonadism affects approximately 6–12% of men between ages 40 and 70. The prevalence is higher in men with obesity, type 2 diabetes, insulin resistance, or chronic illness.
This transition reflects more than just waning testicular function. It involves a broader physiological shift influenced by stress, metabolism, nutrient status, and environmental factors — many of which are modifiable.
Common Signs and Symptoms of Andropause
Andropause symptoms often develop slowly and can be easy to attribute to normal aging or lifestyle stress. They typically fall into several categories:
Sexual Health Changes
- Reduced libido
- Fewer morning erections
- Erectile difficulties (often linked to low free testosterone or elevated estrogen activity)
Fatigue and Low Vitality
- Diminished energy and stamina
- Reduced motivation
- Chronic fatigue, often worsened by poor sleep or ongoing stress
Changes in Body Composition
- Loss of lean muscle mass
- Increased abdominal (visceral) fat
- Reduced strength and exercise capacity
Mood and Cognitive Changes
- Irritability or low mood
- Apathy
- Brain fog and reduced mental clarity
Cardiometabolic Effects
- Worsening insulin resistance
- Unfavorable cholesterol patterns
- Increased cardiovascular risk
These symptoms often overlap and can significantly impact quality of life when left unaddressed.
Andropause Is More Than Just Low Testosterone
While declining testosterone plays a central role, andropause involves multiple interconnected systems. Key contributing factors include:
- HPA Axis Dysfunction: Chronic stress suppresses signals that stimulate testosterone production.
- Insulin Resistance and Visceral Fat: Excess abdominal fat increases aromatase activity, which converts testosterone into estrogen.
- Elevated SHBG: This protein binds testosterone tightly, reducing the amount of free, active hormone available to tissues.
- Environmental Estrogens: Exposure to endocrine-disrupting chemicals (such as BPA and phthalates) can interfere with androgen signaling.
- Nutrient Deficiencies: Low levels of zinc, vitamin D, magnesium, and B vitamins impair hormone synthesis and balance.
The good news? Many of these drivers are modifiable through lifestyle and targeted support.
Why Testosterone May Decline Faster Than Expected
Testosterone decline with age is normal, but lifestyle and health factors can accelerate it. Chronic stress, poor sleep, excess body fat, and nutrient gaps can all speed up the process and worsen male hormone imbalance. By addressing these root causes, many men can slow the decline and improve how they feel.
How Functional Medicine Evaluates Andropause
A proper evaluation goes beyond a single total testosterone test. Functional medicine practitioners assess:
- Total and free testosterone (the active form)
- SHBG (sex hormone-binding globulin)
- Estradiol (E2)
- LH and FSH (to understand whether the issue is primary or secondary)
Labs are best done in the early morning (7–10 a.m.) on at least two separate occasions. Symptoms + lab results together provide the clearest picture.
A Functional Medicine Approach to Supporting Hormone Balance
Rather than jumping straight to medication, functional medicine focuses on optimizing the body’s natural hormone production and function first.
Lifestyle Foundations
- Regular resistance training and physical activity
- Quality sleep (7–8 hours with consistent bedtime)
- Stress management practices
- Reducing visceral fat through nutrition and movement
Nutritional Support
Key nutrients for men’s hormone health include zinc, vitamin D, magnesium, and boron. These support testosterone synthesis, reduce SHBG, and promote overall balance.
Botanical and Integrative Support
Adaptogens like ashwagandha and rhodiola help with stress resilience. Other botanicals such as tongkat ali, fenugreek, and shilajit are traditionally used to support natural testosterone production and modulate aromatase activity.
This comprehensive approach often leads to meaningful improvements in energy, mood, body composition, and sexual health.
Is Testosterone Replacement Therapy Always the Answer?
Testosterone Replacement Therapy (TRT) can be helpful for some men with clinically significant deficiency. However, in functional medicine, it is often considered after addressing reversible causes. Optimizing lifestyle, metabolism, stress, and nutrient status frequently improves symptoms without needing exogenous hormones. For men concerned about fertility, supporting natural production is usually prioritized first.
When to Seek Help
Don’t dismiss persistent symptoms as “just aging.” Consider evaluation if you’re experiencing:
- Ongoing fatigue or low motivation
- Unexplained weight gain or muscle loss
- Declining libido or sexual performance
- Brain fog or mood changes
- Reduced strength or recovery
Early assessment can make a significant difference in long-term health and quality of life.
Andropause is a real physiological transition, but it doesn’t have to mean accepting declining vitality. By understanding the symptoms of low testosterone in men and addressing root causes through a functional medicine lens, many men can regain energy, strength, mental clarity, and overall well-being.
If you’re noticing changes in how you feel, you don’t have to navigate this alone. A proactive, personalized approach can help you feel stronger and more vital at any age.
Let’s Get Started
To learn more about Andropause, you can register for our Live Q&A HERE.
LIVE Q&A: ANDROPAUSE
JUNE 26, 2026
4 PM EST
COST: FREE
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