Three levers for bone density after 50.

This week the newsletter is answering three questions we keep getting in reply. Friday's is the last one: how do I actually keep my bones strong as I age?

Short honest answer. Three levers, ranked by evidence. The load you put on your skeleton. The supplement stack that supports the remodelling. And the baseline scan you have almost certainly never had.

The size of the problem is worth pausing on. Roughly 54 million American adults over 50 have osteoporosis or low bone mass, per the Bone Health and Osteoporosis Foundation. 12.6% meet the criteria for osteoporosis outright, and 43.1% have low bone mass. Higher in women, but 33.5% of men over 50 also carry low bone mass. Almost all of it is asymptomatic until the first fracture.

The single strongest intervention for building bone after 50 is heavy resistance training combined with impact loading. Walking maintains. Heavy loading remodels.

The reference trial is Steven Watson and colleagues at Griffith University, the LIFTMOR trial, Journal of Bone and Mineral Research 2018. 101 postmenopausal women with osteopenia or osteoporosis. Twice weekly, 30-minute supervised sessions of heavy resistance and impact training. 5 sets of 5 reps at over 85% of their one-rep-max on deadlifts, squats, and overhead press, plus jumping chin-ups with drop landings. Over 8 months, the high-intensity group increased bone mineral density at both the lumbar spine and femoral neck. The control group lost density. Zero fractures occurred in the training arm, which was the safety question everyone had going in.

Twice a week. Thirty minutes. Heavy compound lifts and controlled landings. That is the dose.

The supplement conversation around bone is where most of the misinformation sits.

Calcium supplements alone are not the answer. Mark Bolland and colleagues at the University of Auckland, BMJ 2015 reviewed the trial evidence and found dietary calcium was not associated with fracture risk and that supplement evidence for fracture prevention was weak. Their earlier 2010 and 2011 BMJ meta-analyses found calcium supplements without vitamin D increased the risk of heart attack, and the Women's Health Initiative reanalysis showed a 16% increase in the combined MI plus stroke risk with calcium and D3 supplements in women not already on them. Get your calcium from food. Sardines, yoghurt, kale, tofu, tahini.

The stack that earns its slot after 50 looks like this. Vitamin D3 at 2,000 to 4,000 IU daily, ideally verified with a 25-OH-D blood test. Magnesium glycinate at 300 to 400mg. Vitamin K2, which has mixed clinical evidence but the biochemistry to justify pairing with D3.

Third-party-tested picks we would recommend: Thorne D3+K2, Sports Research Vitamin D3, and Doctor's Best Magnesium Glycinate. For the strength side of the loading equation, add creatine at 5g daily: Thorne Creatine or Klean Athlete Creatine.

Collagen peptides at 5g daily have shown modest BMD gains in postmenopausal women in trials by Denise König and colleagues at the University of Freiburg, Nutrients 2018. Not the main lever, and one to skip for now.

The single test that answers "how strong are my bones actually" is a DEXA scan. It gives you a T-score, an age-adjusted comparison, and the trajectory you are on. Most adults over 50 have never had one.

If your bones are strong, you learn it and stop worrying. If you have quiet loss, you find it years before the first fracture, and you have time to reverse it with the load and stack above.

Book your baseline DEXA scan. The density it measures is the only reliable answer to how you are actually tracking.

US: BodySpec — $45 to $65 at 100+ locations across most major metros.

Everywhere else: Google "DEXA scan near me" - a 10-minute search will find a nearby imaging clinic you can book directly.

Two things this weekend. One heavy 30-minute lower-body session. Squats, deadlifts, or their kettlebell equivalents at a weight that feels genuinely hard for 5 reps. Finish with 20 low-impact jumps or drop-downs from a step. Second, if you have never had a DEXA scan, book one in the next fortnight. Both are worth more than any supplement you can buy.

Monday takes a step back into cellular longevity. Why your mitochondria peak around age 30, and the four peer-reviewed levers that actually rebuild them from midlife on.

Until Monday.

Longevity Daily / The Building Decades