Why Testosterone Matters for Men's Overall Health
Testosterone is often reduced to a conversation about sex drive and muscle mass, but its role in men's health is far broader. This primary male sex hormone influences energy levels, mood, cognitive function, bone density, red blood cell production, body composition, and cardiovascular health. Keeping testosterone in a healthy range is genuinely important — not just for performance, but for long-term wellbeing.
What Counts as a "Normal" Testosterone Level?
Testosterone is typically measured via a morning blood test (levels fluctuate throughout the day, peaking in the early hours). Reference ranges vary by laboratory, but a general guide:
| Classification | Total Testosterone (nmol/L) | Total Testosterone (ng/dL) |
|---|---|---|
| Low (hypogonadism) | Below 8–10 nmol/L | Below 230–288 ng/dL |
| Normal range | 10–35 nmol/L | 288–1000 ng/dL |
| Optimal (for most men) | 15–25 nmol/L | 430–720 ng/dL |
It's worth noting that where you fall within the normal range matters less than how you feel. Some men feel excellent at the lower end; others feel symptoms at mid-range. A full hormonal panel (including free testosterone, LH, FSH, and SHBG) gives a clearer picture than total testosterone alone.
Signs Your Testosterone May Be Low
- Persistent fatigue and low energy despite adequate sleep
- Reduced libido or sexual desire
- Difficulty achieving or maintaining erections
- Decreased muscle mass or strength despite regular training
- Increased body fat, particularly around the abdomen
- Low mood, irritability, or brain fog
- Reduced body or facial hair growth
- Poor concentration or memory
If several of these apply to you, speak to your GP about getting a blood test. Don't self-diagnose or self-treat — many of these symptoms overlap with other conditions.
What Negatively Impacts Testosterone?
A number of lifestyle and environmental factors can suppress testosterone:
- Poor sleep: The majority of testosterone is produced during sleep. Even a few nights of poor sleep measurably lowers levels.
- Chronic stress and elevated cortisol: Cortisol and testosterone have an inverse relationship.
- Excess body fat: Adipose (fat) tissue converts testosterone to oestrogen via a process called aromatisation.
- Excessive alcohol consumption: Alcohol directly impairs testosterone production in the testes.
- Sedentary lifestyle: Physical inactivity is consistently associated with lower testosterone.
- Very low-fat diets: Testosterone is synthesised from cholesterol — dietary fat is a necessary precursor.
Evidence-Based Ways to Support Healthy Testosterone
- Prioritise sleep: Aim for 7–9 hours of quality sleep per night. This is the single most impactful factor.
- Strength train regularly: Compound lifts (squats, deadlifts, bench press) are associated with acute testosterone boosts and long-term hormonal health.
- Maintain a healthy body weight: Reducing excess body fat, particularly visceral fat, directly improves testosterone levels.
- Eat adequate dietary fat: Include healthy fats from sources like olive oil, eggs, nuts, avocado, and oily fish.
- Manage stress: Chronic stress chronically suppresses testosterone — stress management strategies have a real hormonal benefit.
- Limit alcohol: Keeping intake moderate or low protects testicular function.
- Get adequate zinc and vitamin D: Both nutrients are involved in testosterone production. Sunlight exposure and foods like oysters, beef, and seeds support these levels.
What About Testosterone Replacement Therapy (TRT)?
TRT is a legitimate medical treatment for men with clinically confirmed hypogonadism — low testosterone with corresponding symptoms. It is not a lifestyle upgrade for men with normal levels. TRT has real risks and side effects and should only be prescribed and monitored by a qualified endocrinologist or urologist. If you suspect low testosterone, the right first step is a conversation with your GP.