(~5 min read)
Most tired men don't have low testosterone. They have a sleep problem, a waistline problem, or both.
If you're a man with a phone, you've probably already been told you have low testosterone. Tired by 3pm? Low T. Bench stuck for six months? Low T. Can't be bothered with much anymore? Low T, and conveniently, there's a test kit in the bio.
Here's the uncomfortable bit. For most men who feel like that, testosterone isn't the problem. The problem is usually the stuff they'd rather not change. And a blood test you post off from your kitchen is a lot easier to buy than an earlier bedtime.
Who's telling you you're broken
A 2025 study in JAMA Network Open looked at 982 popular Instagram and TikTok posts about five trendy medical tests, testosterone among them (Nickel et al., 2025). About 6% referenced any evidence. Fewer than 15% mentioned a possible downside. And 68% of the accounts behind them had a financial interest, usually selling the test, the clinic visit or the fix.
A separate, smaller analysis from the same research group looked at low T content specifically (Gram et al., 2025). The pattern was hard to miss. Low testosterone was sold as a threat to your manhood, and repackaged from an older man's issue into a young, fit man's problem. That study describes themes rather than counting them, but if you've spent five minutes on the feed, you'll recognise every one.
None of this means low testosterone isn't real. It is. It's just rarer and more specific than the people selling the kits want you to think.
Feeling flat isn't a diagnosis
The best data on this comes from the European Male Ageing Study (Wu et al., 2010). Researchers took a random sample of 3,369 men aged 40 to 79 across eight European countries, measured morning testosterone properly, and asked about a long list of symptoms.
Fatigue, low mood and struggling with hard exercise were linked to lower testosterone, but only loosely. Loads of men had them with perfectly normal levels.
The symptoms that genuinely tracked with low testosterone were sexual. Fewer morning erections, low sex drive and erection problems. When the researchers defined real late-onset hypogonadism as all three of those plus a clearly low blood level, about 2% of the men qualified.
Two percent. In men up to 79.
So if you're 35, knackered and frustrated with the gym, the odds are heavily in favour of something else. That's good news, by the way. The something else is usually in your hands.
Sleep is the cheapest testosterone booster there is
In a lab study, 10 healthy young men spent a week sleeping five hours a night (Leproult and Van Cauter, 2011). Their daytime testosterone dropped by 10 to 15%. The authors pointed out that normal ageing takes off roughly 1 to 2% a year.
Read that again. One week of short sleep did what years of getting older would.
Keep it in proportion. Ten men, one week, in a lab. It doesn't tell us what years of bad sleep do, and the dip wasn't a slide into deficiency. But most of your daily testosterone is released while you sleep, and plenty of men are trying to fix their hormones on six hours, a late phone scroll and a double espresso.
If you snore loudly, wake up gasping, or your partner has mentioned you stop breathing at night, get checked for sleep apnoea. It's linked to lower testosterone and it's worth sorting for a lot of other reasons too.
Your waistline is talking to your hormones
A 2013 meta-analysis pooled 24 studies of men with obesity who lost weight (Corona et al., 2013). Testosterone went up across the board. With a low-calorie diet, total testosterone rose by about 2.9 nmol/L on average. After weight-loss surgery, where people lose far more, it rose by about 8.7 nmol/L. The more weight lost, the bigger the rise.
These were men with obesity, some of it severe, so if you're already lean, dropping another few kilos probably won't move much. But if you're carrying a fair bit round the middle, this is likely the biggest lever you've got. Body fat is hormonally active tissue, and carrying more of it is linked to lower testosterone.
Lifting won't send your levels through the roof, whatever the supplement ads promise. What it does is build muscle, help shift body fat and, for most men, improve sleep and mood. That's plenty.
Drink deserves an honest look as well. Heavy drinking is linked to lower testosterone, though the studies vary too much in who they looked at for me to hang a number on it. In practice, if it's a few most nights, cutting back tends to help sleep, energy and your waistline all at once.
When a test actually makes sense
If you've got the sexual symptoms and they've stuck around, get tested. Properly.
The Endocrine Society's guideline sets out what that means (Bhasin et al., 2018). Test men with symptoms, not as a routine check. Use a fasting blood sample taken first thing in the morning, analysed by a reliable lab. Repeat it, because one low result isn't enough. And if it comes back low, find out why before anyone talks about treatment.
That's a long way from an afternoon finger-prick you send off from the kitchen table. Testosterone swings through the day and from day to day, so a one-off reading tells you very little.
If you're in that boat, see a specialist in men's hormones, like an endocrinologist or a men's health doctor. Testosterone therapy is a medical decision with real trade-offs, fertility included. It shouldn't start with a discount code.
What I'd do this week
No sexual symptoms, just feeling flat? Give the basics a proper go for 8 to 12 weeks before you go hunting for a diagnosis. That timeframe is my coaching rule of thumb, not a study number.
Be in bed long enough to get seven hours or more, and get up at roughly the same time most days. If you're carrying extra weight, run a steady calorie deficit with plenty of protein. Lift two to four times a week and actually show up. Keep the weeknight pints for the weekend.
Then take stock. Energy, drive, mood, how training's going. If things are still off, or the sexual symptoms show up, that's your cue to get bloods done properly.
Most men never get that far, because they buy the kit, see a number they don't understand and either panic or shrug. Don't be that guy. Fix what you can control first, and test properly if you still need to.
If you want someone in your corner for the sleep, food and training side, send me a DM on Instagram at @wtf_coaching or apply through the website.
This is a general guide, not medical advice. If you have a diagnosed condition, take medication, or have symptoms that won't settle, speak to a relevant specialist such as an endocrinologist or men's health doctor.
Sources:
Nickel, B., et al. (2025). Social media posts about medical tests with potential for overdiagnosis. JAMA Network Open.
Gram, E.G., et al. (2025). Selling masculinity: a qualitative analysis of gender representations in social media content about "low T". Social Science & Medicine.
Wu, F.C., et al. (2010). Identification of late-onset hypogonadism in middle-aged and elderly men. New England Journal of Medicine.
Leproult, R. & Van Cauter, E. (2011). Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA.
Corona, G., et al. (2013). Body weight loss reverts obesity-associated hypogonadotropic hypogonadism: a systematic review and meta-analysis. European Journal of Endocrinology.
Bhasin, S., et al. (2018). Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline. Journal of Clinical Endocrinology & Metabolism.
