Aging

If you wear a watch or a band, you know the picture: it’s eleven at night, you’re two thousand steps short, so you walk laps around your building. The watch sets off fireworks and you feel like you’ve done your duty for the day. That number — 10,000 — you’ve assumed is a scientific standard. It isn’t. It was a slogan invented in 1965 by a Japanese clock company to sell pedometers, and at the time there was no research behind it at all. The science only got bolted on decades later. ...

There’s a number hiding on the blood panel most men over 40 skip reading. It’s not cholesterol, not HbA1c, not testosterone. It’s vitamin D — and if it’s low, it’s quietly doing more damage to your muscle than you think. Here’s the catch, and it’s the entire point of this post: vitamin D is not a supplement that makes you stronger. It’s a deficiency marker. Below a threshold it’s associated with weaker muscles and worse physical function. Above that threshold, taking more does almost nothing. The supplement industry wants you to forget that distinction, because “take this to get jacked” sells better than “check this one number so you know you’re not deficient.” ...

Creatine is a strange case. It is simultaneously the most heavily researched supplement in the history of sports nutrition and the one most wrapped in folklore — the thing your gym buddy swears by and your brother-in-law swears will wreck your kidneys. Neither of them has read a study. Strip away the noise and creatine is boring in the best possible way. It’s a naturally occurring compound your body already makes (about a gram a day) and stores in muscle. Supplementing it just tops up the tank — and the tank is what powers every short, explosive effort you make, from the last grinding rep on a squat to the sprint up a flight of stairs. ...

Somewhere around forty, a well-funded corner of the wellness industry decides you have a problem and offers to sell you the solution. The problem is called “low T.” The solution is a subscription. And the whole thing rests on one of the most successful fear campaigns in modern men’s health. Here’s the quiet truth underneath it: testosterone does decline with age — slowly, predictably, and mostly harmlessly for the vast majority of men. The “manopause” cliff everyone’s warning you about is real only in the sense that a gentle slope is technically a slope. ...

Somewhere around fifty, the fitness industry hands you a script and expects you to read it: your muscle-building days are over. You’re fighting a losing battle against aging. Here, buy this supplement. It’s one of the most successful fear campaigns in the entire health space — because it tells a story people are primed to believe. And it collapses the moment you look at the actual research. Can you build muscle after 50? Yes. And not by a little. Untrained men in their sixties and seventies — people the “cliff” story would have you believe are finished — reliably gain serious, measurable muscle. The question isn’t whether it’s possible. It’s why the honest answer makes the fear-marketers so uncomfortable. ...