Physical Wellness
Researchers at an exercise-medicine clinic in Rio de Janeiro tracked what a thirty-second floor test could predict. They asked 2,002 adults aged 51 to 80 to sit down on the floor and stand back up with as little support as they could manage. Each person started at 10 points and lost one for every hand, knee, or forearm used.
Over the next six years, 159 of them died. People in the lowest scoring band were more than five times as likely to die as those in the highest, after adjusting for age, sex, and body mass index. The group published the result in the European Journal of Preventive Cardiology in 2012. The test measures leg strength, flexibility, and balance, none of which appear on a standard lab panel.
What it covers
Physical wellness is capacity: what your body can do without help, whether you can carry groceries up the stairs, or get down on the floor with a grandchild and back up. It rests on four things.
Movement
Enough walking and loading to keep muscle, bone, and balance from eroding.
Food
Raw material for repair, most of it from plants and as little as possible from a factory.
Sleep
Seven or more hours a night, the window when the immune system and the brain do their maintenance.
Prevention
Screenings, vaccines, and blood pressure checks that find problems while they are still quiet.
Why it comes first
Physical opens the series because it is the easiest of the nine to measure, and the others rest on it. In college my VO2 max tested at the level of an Olympic athlete. Residency ended that. The hours were long, there was no time to cook, and I lived on convenience food. By the time I joined the faculty at Duke I was a hundred pounds heavier.
Around 2004 the abdominal pain started, and I called it stress. (Physicians are poor at diagnosing themselves, and worse at admitting what they find.) In 2006 I was admitted to Duke needing a blood transfusion, and a CT scan showed Crohn's disease in my small intestine. I slept badly. I had less patience with residents and with myself.
I didn't have the Nine Dimensions framework then. With it, I would have seen that the problem had a starting point, and that the starting point was my body. I have been off all medication since 2015, and most of what changed was food, sleep, and movement. This is what happened to me. It is not a treatment for Crohn's.
What the research measures
A consortium led by the University of Massachusetts Amherst pooled step-counter data on 47,471 adults from 15 cohorts and published it in The Lancet Public Health in 2022. Risk of death fell as daily steps rose, then leveled off: between 6,000 and 8,000 steps for adults 60 and older, and between 8,000 and 10,000 for younger adults.
The PURE study, coordinated from McMaster University, measured grip strength in 139,691 adults across 17 countries. Each 5-kilogram drop in grip was associated with a 16% higher risk of death from any cause, and grip predicted death better than systolic blood pressure did. The finding is observational. No trial has shown that training grip strength lowers mortality, and grip may simply track how much the whole body gets used.
In 2019, NIH researchers admitted 20 adults to the Clinical Center in Bethesda and fed them an ultra-processed diet for two weeks and an unprocessed diet for two weeks. The meals offered were matched for calories, energy density, macronutrients, sugar, fiber, and sodium, and people ate as much as they wanted. On the ultra-processed diet they ate about 500 more calories a day and gained close to a kilogram.
Listen and read
The Well-IQ assessment is free and takes about 15 minutes. It scores Physical alongside the other eight dimensions.
Educational content, not medical advice.