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XY Files Blog

Evidence-based articles on testosterone, hormones, fitness, and longevity, so you can make informed decisions about your health.

Why do i get so hot when i sleep: The science of night sweats and overheating

Why do i get so hot when i sleep: The science of night sweats and overheating

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Veedma's editorial team: Evidence-based men's health
Dec 05, 2025 · 15 min read

You get hot in your sleep when the normal nighttime drop in core body temperature of about 0.5 to 1.0 °C (1 to 2 °F) is disrupted, prompting the hypothalamus to open skin blood vessels and activate sweating to dump heat. The good news is that the trigger is often changeable, such as room setup, alcohol, stress, ...

Does stress cause low testosterone in men? What science really shows

Does stress cause low testosterone in men? What science really shows

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Veedma's editorial team: Evidence-based men's health
Dec 05, 2025 · 12 min read

Chronic stress may contribute to low testosterone, and sleep loss, weight changes and other health problems can occur alongside it. Human studies do not establish a simple, consistent effect of psychological stress alone. Persistent symptoms and a low result need repeat morning testing and a review of other causes. Key takeaways Human studies of psychological ...

Semen retention meaning and the science behind the hype

Semen retention meaning and the science behind the hype

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Veedma's editorial team: Evidence-based men's health
Dec 05, 2025 · 12 min read

Semen retention is deliberately avoiding ejaculation for a period of time. One small study found somewhat higher testosterone after three weeks of abstinence, but there is no evidence that levels keep rising the longer a man abstains. Here’s what the evidence says about how “holding semen” affects hormones, mood, sex, and long-term health. Key takeaways ...

Does testosterone cause hair loss? Separating hormonal fact from fiction

Does testosterone cause hair loss? Separating hormonal fact from fiction

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Veedma's editorial team: Evidence-based men's health
Dec 04, 2025 · 11 min read

Testosterone itself isn’t the direct cause of male pattern hair loss; the issue arises when 5‑alpha reductase converts it into DHT, which miniaturizes genetically androgen‑sensitive scalp follicles even when total testosterone is normal. With androgenetic alopecia affecting roughly 30% to 50% of men by age 50, the real question is whether your follicles are “wired” ...

Lifting in Converse: The biomechanics, benefits, and risks of flat sole training

Lifting in Converse: The biomechanics, benefits, and risks of flat sole training

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Veedma's editorial team: Evidence-based men's health
Dec 04, 2025 · 11 min read

Converse-style zero-drop, incompressible flat soles can improve center-of-pressure stability and reduce energy loss from sole compression in deadlifts, but for squats they remove the 0.75 to 1 inch heel lift that helps ankle dorsiflexion. If mobility is restricted, that can increase knee and lumbar torque. Here is how to know when flat shoes are the ...

What are the essential biomarkers runners should track? The numbers that flag fatigue, overtraining, and low testosterone

What are the essential biomarkers runners should track? The numbers that flag fatigue, overtraining, and low testosterone

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Veedma's editorial team: Evidence-based men's health
Dec 04, 2025 · 15 min read

For male runners, the essential biomarker list starts with ferritin and iron studies, vitamin D, glucose, and a hormone panel that includes total testosterone, free testosterone, LH, and FSH, because a low testosterone value only matters when symptoms persist and the pituitary signals are checked too. Magnesium and potassium are usually checked when clinically indicated, ...

How to get rid of food noise. What actually works for men

How to get rid of food noise. What actually works for men

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Veedma's editorial team: Evidence-based men's health
Dec 03, 2025 · 14 min read

You get rid of food noise by lowering the biologic drivers that keep appetite turned up. Meals built around 25 to 30 g of protein, fewer ultra processed cues, and 7 to 9 hours of sleep can all help quiet constant food thoughts. For eligible men, obesity medicines are linked to about 14.9% to 20.9% ...

Do runners live longer? The science behind mileage and mortality

Do runners live longer? The science behind mileage and mortality

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Veedma's editorial team: Evidence-based men's health
Dec 03, 2025 · 15 min read

Yes. Recreational runners generally live longer than non-runners, and even 5 to 10 minutes a day at an easy pace is associated with lower mortality and longer lifespan. In one Danish cohort the lowest mortality came with moderate weekly volume (about 1 to 2.5 hours), not marathon-level mileage. Here is how it works and how ...

Testosterone killing foods: What actually lowers T in men and what to eat instead

Testosterone killing foods: What actually lowers T in men and what to eat instead

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Veedma's editorial team: Evidence-based men's health
Dec 03, 2025 · 14 min read

“Testosterone killing foods” are foods that, when eaten often as part of an ultra processed Western style diet, are linked to lower testosterone in men through inflammation, insulin disruption, and weight gain. You do not need a perfect diet. You need a few high impact swaps and the right lab work to confirm what is ...

On Cloud X 3 review: The biomechanics of a true hybrid training shoe

On Cloud X 3 review: The biomechanics of a true hybrid training shoe

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Veedma's editorial team: Evidence-based men's health
Dec 02, 2025 · 11 min read

The On Cloud X 3 works as a true hybrid only for moderate lifting and short runs of about 1 to 4 miles, not as a replacement for dedicated lifting shoes or daily trainers. This On Cloud X 3 review is a biomechanics based look at the Cloud X3 training shoe, not a brand ad, ...

Volume eating: The simplest way for men to cut calories without feeling hungry

Volume eating: The simplest way for men to cut calories without feeling hungry

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Veedma's editorial team: Evidence-based men's health
Dec 02, 2025 · 12 min read

Volume eating is a nutrition strategy that emphasizes high volume, low calorie foods so you feel full while naturally eating fewer calories. Done right, it can make fat loss feel less like willpower and more like smart meal design. Key takeaways Volume eating focuses on high water and high fiber foods like non starchy vegetables ...

Dry skin on penis or eczema on the pennis? Causes, symptoms, and fixes

Dry skin on penis or eczema on the pennis? Causes, symptoms, and fixes

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Veedma's editorial team: Evidence-based men's health
Dec 02, 2025 · 14 min read

Most cases of dry, flaky, or itchy penile skin are irritant contact dermatitis from barrier breakdown in the penis’ thin stratum corneum (often triggered by friction, sweat, soaps, detergents, or condoms), not an STI. Here’s how to tell simple irritation from eczema, psoriasis, yeast, or balanitis. Here is what actually helps the skin heal. Key ...