Peter Attia MD322 - Bone health for life: building strong bones, preventing age-related loss, osteoporosis, & more
CHAPTERS
- 0:00 – 8:20
Belinda Beck's path from shin splints to bone research
Peter Attia welcomes Belinda Beck, and she explains how her own sore shins as a runner led to research on bone adaptation to loading. She describes her move from animal studies to clinical trials and her current role as an exercise physiologist at Griffith University who set up The Bone Clinic.
- •Beck's interest began with tibial stress injuries, which she found to be bone injuries
- •She pursued how bone adapts to mechanical loading, known as Wolff's law
- •She did a postdoc at Stanford, overlapping with Attia's time there
- •She is an exercise physiologist, not a clinician, and runs The Bone Clinic as a translational research facility
- •Clinic patients are research participants with annual testing
- 8:20 – 13:50
Bone types, microstructure and Wolff's law
Beck describes the types of bone and the cortical and trabecular structure, including how trabeculae align to the forces on bone. Attia asks her to state Wolff's law and whether it depends on other physiological conditions.
- •Long, short and irregular bones are made of cortical and trabecular bone
- •Lamellar collagen layers make cortical bone resistant to torsion, compression and tension
- •Trabeculae in the proximal femur align to withstand bending loads
- •Wolff's law means bone adapts to the loading it is chronically exposed to
- •Beck regards the adaptation as a physical phenomenon, like gravity
- 13:50 – 21:25
Bone growth from birth to peak mass: osteoporosis as a childhood disease
Beck explains how the skeleton grows from a cartilage model, when growth plates fuse, and why peak bone mass matters. Attia uses a glider analogy, and they discuss the genetic share of bone mass.
- •The skeleton starts as a cartilaginous model that is progressively ossified
- •Growth spurts come at around 12 in girls and 13-14 in boys, and growth plates fuse by the late teens to mid-20s
- •Osteoporosis is often called a childhood disease because peak bone mass is set early
- •Beck puts the genetic contribution to bone mass at about 70-80%
- •BMD is a proxy for bone mass, and the plateau and rate of loss are most amenable to exercise
- 21:25 – 29:06
Osteoblasts, osteoclasts, estrogen and why women fracture more
Beck covers the bone cell types and remodeling, and how the loss of estrogen at menopause lets osteoclasts resorb bone rapidly. They discuss why more women than men fracture and why women fall more.
- •Osteocytes maintain bone and sense its environment, osteoblasts form bone and osteoclasts resorb it
- •Remodeling removes microdamage, adapts bone to loading and releases calcium
- •Estrogen restrains osteoclasts, so bone loss accelerates for five to eight years after menopause
- •Women have less peak bone, lose more and fall more, which drives higher fracture rates
- •Attia summarizes the balance of bone cells across life and notes men's estrogen falls with testosterone
- 29:06 – 39:48
Calcium, dairy and vitamin D for children's bone health
Attia asks what parents can do for their children's bones. Beck starts with diet, covering calcium needs, dairy sources, sun exposure for vitamin D, and the uncertainty over vitamin D targets and supplementation.
- •Teenagers need about 1,000 mg of calcium a day, with vitamin D needed for absorption
- •Milk, yogurt and cheese are the best sources, and low-fat milk contains slightly more calcium
- •Sunlight is the most efficient source of vitamin D, but sun avoidance has led to deficiency in Australia
- •Experts disagree on vitamin D thresholds, and Beck notes hyperdosing can increase falls
- •Attia describes supplementing 5,000 IU daily to keep his own level at 50-60
- 39:48 – 50:23
Best sports for bone: impact, variety and what swimming misses
Beck explains that high-load, varied activities such as jumping and landing do the most for bone. They discuss the 1992 Stanford athlete study, why swimmers and cyclists had lower BMD, and why running alone is limited.
- •Anything is better than nothing, but high-strain activities give the most benefit to bone
- •Variety within and across sports makes bones adapt more robustly
- •In the Stanford study, swimmers had the lowest BMD, cyclists matched sedentary controls and gymnasts were highest
- •Observational biases such as self-selection limit that study
- •Attia notes powerlifting, football and jujitsu also rank high, and the aim is to replicate the loading
- 50:23 – 53:15
Weight training for kids and teaching technique
Beck and Attia dismiss the myth that lifting stunts children's growth. They discuss letting kids join parents in the gym, teaching technique such as the deadlift, and not forcing activity children dislike.
- •Beck knows of no evidence that resistance training stunts growth
- •Children should not be loaded with enormous weights, and enjoyment matters most
- •Bringing kids along to the gym lets them copy parents
- •Teaching a good deadlift early is valuable
- •Attia's young sons are competitive with kettlebell deadlifts, and their technique breaks down at heavy loads
- 53:15 – 57:14
Corticosteroids and children's bone health
Attia asks about children who need corticosteroids for conditions such as asthma. Beck says steroids should be minimized and that they are bad for bone, and the two discuss stacking other bone-protective habits.
- •Beck says there is no long-term data on inhaled steroids that she is aware of, and this is outside her area
- •She advises minimizing steroids and staying off steroid inhalers if possible
- •Corticosteroids can be life-saving, and use should end as soon as the condition settles
- •Adults on high doses may need bone medication
- •Attia suggests that children on steroids should get diet, sun, weights and varied sport
- 57:14 – 1:06:07
Maintaining bone in midlife: is age-related bone loss really inactivity?
Turning to adults in their thirties and forties, Beck says the advice is the same as for children. She argues that bone decline reflects sedentary behavior rather than programmed aging, and Attia adds supporting arguments about muscle and anabolic resistance.
- •Maintaining diet and activity is what bones need through midlife
- •Beck argues the typical plateau-then-loss curve reflects sedentary behavior
- •Masters athletes maintain BMD while they keep training
- •Attia cites a leg-cast study suggesting inactivity drives anabolic resistance
- •Both doubt a drug will replicate the stimulus of exercise on muscle and bone
- 1:06:07 – 1:10:19
Menopause, HRT and who comes to the clinic
Attia raises the menopause transition and his view that the Women's Health Initiative scared people away from HRT. Beck describes who attends the clinic, and Attia stresses starting estrogen replacement before bone has already been lost.
- •Attia argues the Women's Health Initiative led to an erroneous conclusion that deterred HRT
- •Most clinic patients are postmenopausal, but awareness among pre-menopausal women is growing
- •Many people learn their bone status only after a fracture or a baseline DEXA
- •Attia says estrogen should not wait until menopause is complete, since data suggest bone is lost before that point
- 1:10:19 – 1:18:32
Reading a DEXA scan: areal BMD, T-scores and Z-scores
Beck explains how DEXA measures areal density, why whole-body scans aren't used for diagnosis, and how T-scores and Z-scores are defined. Attia describes how he frames them for patients.
- •DEXA gives areal density in g/cm², not volumetric density
- •Osteoporosis is diagnosed from spine and hip scans, not whole-body scans
- •A T-score of -2.5 or below defines osteoporosis, and -1 to -2.5 is osteopenia
- •The T-score compares to a young normal and the Z-score to age- and sex-matched peers
- •Attia aims to hold the T-score and watch the Z-score rise relative to peers
- 1:18:32 – 1:29:39
The LIFTMOR trial: design and training of postmenopausal women
Beck explains why she tested heavy lifting in women with low bone mass and describes the design of LIFTMOR. She describes the safe coaching of older participants, including those with kyphosis.
- •Prior exercise guidelines told people with osteoporosis to stop high-load activity and prevent falls
- •The program was 30 minutes twice a week at 85% 1RM, using free-weight compound lifts such as squat and deadlift
- •About 100 postmenopausal women with low bone mass were randomized to heavy training or a low-intensity home program
- •Training began with a broomstick and progressed gradually, with technique prioritized
- •Older people are capable of learning lifts, and coaches need clinical training
- 1:29:39 – 1:40:47
LIFTMOR results: bone, function and quality of life
Beck reports spine and hip results, including large cortical thickening at the femoral neck, along with improved function and posture. Attia and Beck discuss how these gains lower fall and fracture risk and the quality-of-life gains participants described.
- •Net spine BMD benefit was a bit over 4%, with controls losing bone
- •Femoral neck BMD changed little but cortical thickness showed a 13% net benefit and 27% at the lateral cortex
- •Strength, balance, functional tests and kyphosis improved, with height a small outcome
- •Improved posture affects vision and fall risk, and Attia adds the brain-stimulation angle
- •Participants described regaining independence, such as gardening and lifting grandchildren
- 1:40:47 – 1:48:47
How to access supervised bone-loading exercise and wrap-up
Attia asks how listeners can get safe training. Beck describes the Ownero program licensed to physiotherapists and exercise physiologists, and gives three tiers of options, and the conversation closes with Attia's remarks on exercise as the most potent drug.
- •Ownero is licensed to physiotherapists and accredited exercise physiologists after six hours of online training
- •The Bone Clinic hosts a map of Ownero providers
- •Without a provider, a telehealth appointment with the clinic can supply a program
- •The fallback is a supervised gym program, especially for people with very low T-scores
- •Attia closes by calling exercise the most potent drug available
