Articles

Research-first writing on sauna, heat, fertility, and men's health. What the evidence actually says, claims examined.

Stress Is Quietly Sabotaging Your Sperm—Here’s What the Science Says
I wasn’t looking for this when I started reading fertility studies a few years back. I was just curious about what actually moves the needle for men trying to conceive. Diet, exercise, smoking, alcohol, underwear choice-you see the same variables controlled for over and over. But then I noticed something else. A handful of researchers had started asking men about their stress levels. And the numbers changed.Men who reported high stress-measured through validated questionnaires-had lower sperm concentration, lower motility, and more DNA damage. The effect was dose-dependent. More stress, worse... Read more...
What I Learned About Sauna Safety After Reading the Actual Research
I spent several weeks digging into the research on sauna safety. Not the marketing fluff from spa websites, not the liability waivers from gym chains. The peer-reviewed studies. Finnish cohort data. Physiology journals. Forensic reviews of sauna-related deaths. What I found turned a lot of common advice on its head.Most of the safety rules you see repeated online come from a place of caution, not evidence. That's fine if you're writing disclaimers. But if you're a guy who wants to use a sauna without second-guessing every move, you deserve better... Read more...
What Finnish Men Know About Sauna That Modern Beginners Get Wrong
I spent two years reading the research on sauna before I stepped into one with any idea what I was doing. Most of what I thought I knew came from gym locker rooms and Instagram reels. Stay in as long as you can. Crank the heat as high as it goes. Jump in ice water after. Repeat.Turns out the Finnish men who invented this practice don't do any of that. And they have 2,300 men and 20 years of data to back up their approach.Finnish men who sauna 4 to... Read more...
The Semen Volume Paradox: Why Most Advice on Increasing Ejaculate Is Backwards
I spent three months reading every study I could find on seminal fluid production. What I found runs counter to almost everything you'll read on men's health forums or see in supplement ads.The standard advice-"take more zinc, ejaculate less often, drink more water"-isn't wrong exactly. It's incomplete. And for some guys, it's actively counterproductive.Here's what the research actually shows about how your body produces semen, and why the most effective strategies are the ones nobody talks about.What Semen Actually Is (And Why Volume Matters)Semen is not sperm. That's the first... Read more...
Good Stress, Bad Stress: What Exercise Intensity Actually Does to Your Sperm
I spent three weeks digging into the research on exercise and male fertility before writing this. Not because I was trying to prove something, but because the common wisdom felt incomplete.The popular narrative goes like this: intense exercise heats up your testicles, spikes cortisol, tanks testosterone, and nukes your sperm. The fertility forums are full of guys selling their squat racks and switching to gentle yoga. The message is clear-if you want kids, stop training hard.But that advice, it turns out, is half right and half missing the point entirely.Here... Read more...
Male Infertility and Depression: What the Research Really Shows
Male FertilityEmotional Health
I spent a weird amount of last winter reading studies on male infertility and depression. Not because I had to. Because something about the usual explanation kept bugging me.Every fertility clinic website, every health podcast, every men's wellness article tells the same story: infertility is stressful, stress makes you depressed, and that depression makes everything worse. It's a clean one-way arrow. It's also incomplete.What the deeper research suggests is messier, more interesting, and honestly more useful. Infertility and depression might not be cause and effect at all. They might be... Read more...
How Finnish Grandparents Cleaned Sauna Benches (And Why Science Says They Were Right)
Finnish ResearchHome Sauna
Walk into any American gym sauna and you’ll smell it. Lemon-scented disinfectant. Bleach wipes. Some aerosolized “antibacterial” spray that promises to kill 99.9% of germs. The cleaning cart sits outside the door like a sentinel.Walk into a traditional Finnish sauna and you’ll smell cedar, heat, and nothing else.I spent six months digging into sauna hygiene research-microbiology papers, Finnish cultural practices, environmental health studies-and what I found changed how I clean my own sauna. The Finnish grandparents were right. The chemical aisle was wrong. And the science backs them up.What Actually... Read more...
The Surprising History of Conception Advice—and Why the Every-Other-Day Rule Isn’t Always Right
Male FertilityClaims Examined
If you are trying to conceive, you have probably heard the standard advice: have sex every other day during the fertile window. Maybe you have also heard the older version: “save up” for a few days to build your sperm count. Or maybe a friend told you to have sex daily for better odds.The truth is, advice on how often to have sex for conception has changed a lot over the centuries. And most of it was never based on good science. The every-other-day rule is actually a recent invention,... Read more...
The Infrared Sauna Weight Loss Myth: What Actually Happens to Your Metabolism
Claims ExaminedInfrared Sauna
Infrared saunas don't cause meaningful weight loss through calorie burn, and nearly all the weight you drop in a session is water that returns once you rehydrate. The real metabolic value is indirect: better insulin sensitivity and lower stress that support the actual work of diet, training, and sleep. Read more...
The Real Reason Sperm Counts Are Falling (It's Not Just Heat)
Sperm HealthMicroplastics
Sperm counts have fallen sharply over the last few decades, and the biggest drivers look environmental, not the occasional sauna. Sauna-level heat does lower sperm production for a while, but the effect reverses once the heat stops. Read more...