The Nine Pillars of Health: Building a Long Life Worth Living
By Kevin Wallace, DVM, DACVIM | Mindful Living Sanctuary | October 2026
The research on healthy aging keeps arriving at the same conclusion: a handful of everyday habits, not any single pill or product, explain most of the difference between a long, healthy life and years lost to chronic disease. For years I organized my own thinking around five pillars: nutrition, physical activity, sleep, stress management, and preventive health care. That was a useful frame. It was never the only one.
Popular lists of “five pillars” do not match each other. The closest professional standard is the American College of Lifestyle Medicine’s six: whole-food nutrition, physical activity, restorative sleep, stress management, avoidance of risky substances, and positive social connection. My original five had left out connection and substances, and had put preventive care in their place. The science, and a harder look at my own life, says both belong. So does a sense of purpose. So does hearing.
This article is my list of nine. It grew out of the five I have used for years. It overlaps the lifestyle-medicine six. It does not replace anyone else’s teaching frame. The goal is not simply to live longer. It is to keep living well, with energy, independence, and a clear mind, for as many of those years as possible.
I’ll walk through each pillar, what the research shows, and what it tends to cost when that pillar slips. I’ll also be honest about where I’m still working on it myself. None of us has all of this figured out, and none of this is a treatment plan. If you have a disease, or a medicine that interacts with food, exercise, or alcohol, the person who knows your chart comes first.
Why everyday habits matter so much
Two large studies make the case better than anything I could say.
More healthy years, not just more years. Harvard researchers followed the Nurses’ Health Study and the Health Professionals Follow-up Study, more than 110,000 adults, for decades. They asked a crucial question: not just how long people lived, but how long they lived free of diabetes, heart disease, and cancer. At age 50, women with none of five low-risk habits could expect about 23.7 more years free of those diseases. Women with four or five could expect about 34.4. For men, the figures were about 23.5 years versus 31.1 (1). That is roughly a decade of healthy life, for women, tied to ordinary habits. The five habits were never smoking, a body mass index in the normal range, at least 30 minutes a day of moderate or vigorous activity, a higher-quality diet, and moderate alcohol. I will come back to that last one, because it does not sit easily with newer advice.
Eight habits, up to 24 years. A study of 719,147 U.S. veterans looked at eight habits: being physically active, not smoking, managing stress, eating well, not binge drinking, good sleep, positive social relationships, and being free of opioid use disorder. Men who had all eight at age 40 were predicted to live about 24 years longer than men with none. For women the gain was about 21 years in the VA release of the same analysis, and about 22.6 years in a later account of it (2). Even one habit helped. The lead researcher, Xuan-Mai Nguyen, said it is never too late. Starting at 50 still added up to about 21 years in the public summary, and starting at 60 still added close to 18.
These are observational studies, so they cannot prove cause and effect. People who keep these habits often have other advantages. But the findings line up with decades of other research, and the size of the differences is hard to ignore. The habits were not equal, either. In the veterans data, low activity, smoking, and opioid addiction carried the largest individual risks, on the order of 30 to 45 percent higher mortality. Stress, binge drinking, poor diet, and poor sleep were each around 20 percent. Weak social ties were smaller in that study, about 5 percent, which is a reminder not to treat every pillar as the same size lever.
Pillar 1. Nutrition: whole foods, plants and fiber first
Eat mostly whole, minimally processed foods, with plants at the center and fiber first: vegetables, fruits, beans, whole grains, nuts, and seeds. Limit ultra-processed foods, sugary drinks, and processed meats. Thea and I eat a whole-food, plant-based diet, but the evidence supports the broader principle for everyone: the less processed, the better. See our articles on ultra-processed foods, the Dirty Dozen, and carbohydrates.
If this pillar slips. The quiet cost is metabolic disease. Diets built on ultra-processed food are linked to weight gain, higher blood pressure, worse blood sugar, and more heart disease. Fiber-poor eating starves the gut community that helps regulate inflammation. You do not feel a deficient diet on day one. You feel it as less energy, more cravings, and numbers that drift until a checkup names them.
A pitfall on the other side: perfection. A rigid diet that isolates you from every shared meal can cost the connection pillar. Adequate protein matters more with age, especially if you are mostly plants. B12 is the one I would not leave to chance on a fully plant-based diet.
Pillar 2. Movement: aerobic work, strength, balance, and less sitting
The federal guidelines call for at least 150 minutes a week of moderate aerobic activity, such as brisk walking, plus muscle-strengthening activity on two or more days (3). Aerobic exercise protects the heart and, as we saw in the telomere article, may slow cellular aging. Strength work matters just as much as we age. Muscle is what keeps us independent, able to climb stairs, carry groceries, and get up after a fall. Balance work belongs in the same pillar. So does the ordinary movement of not sitting all day.
If this pillar slips. Muscle leaves faster than it arrives. After about age 50, unused muscle declines year by year, and with it goes balance, bone load, and the ability to live alone. Sitting most of the day raises blood sugar and blood pressure even in people who exercise a few times a week. The veterans analysis put low physical activity among the three habits with the largest tie to earlier death (2). The other failure mode is the opposite: a sudden heroic program that injures a joint and ends the habit. Start where you are. Pain that changes your gait is a reason to get it looked at, not a reason to quit moving.
Pillar 3. Sleep: seven hours, on a schedule
Adults need at least seven hours a night on a regular basis, according to the American Academy of Sleep Medicine and the Sleep Research Society (4). Regular hours, a dark, cool room, and no heroics about grinding through on too little sleep. Short sleep is linked to heart disease, diabetes, weight gain, depression, and faster cellular aging.
If this pillar slips. One short night makes you irritable. A short decade changes appetite hormones, insulin, blood pressure, and reaction time. Sleep debt also mimics a discipline problem. You reach for sugar, skip the walk, and snap at the person you live with. Treating sleep as optional is how the other pillars get raided. Loud snoring, gasping, or waking unrefreshed despite enough hours can be sleep apnea, which is common and treatable, and which I would not try to out-discipline.
Pillar 4. Stress: lower the load that never shuts off
This doesn’t mean being “zen” all the time. It means lowering the load of chronic stress. Short bursts of stress are healthy. It’s the stress that never shuts off that does damage, keeping cortisol elevated, which in turn disturbs sleep, blood sugar, appetite, and immune function. Chronic stress raises blood pressure, wrecks sleep, and, as Dr. Elissa Epel’s research shows, is linked to shorter telomeres. Often the biggest stressors are practical: isolation, money worries, sitting all day, and too little time outdoors. Exercise, time in nature, prayer or meditation, good friends, and simply saying no to some commitments all help. And if stress becomes depression or anxiety, getting professional help is a sign of strength, not weakness.
If this pillar slips. The body keeps the books. Persistent stress shows up as high blood pressure, poor sleep, central weight gain, more infections, and a shorter fuse with the people who could have helped. The pitfall in the other direction is using a wellness routine to avoid a real problem: a debt, a grief, a marriage, a drinking habit. A walk helps. It does not replace the conversation or the counselor.
Pillar 5. Connection: a few people you can count on
If I could have added only one pillar to my old list, it would have been this one. In earlier versions, “people” had a place of its own, and the research says it deserves one.
A landmark analysis combined 148 studies of more than 300,000 people and found that those with strong social relationships had a 50 percent greater likelihood of survival over the course of the studies than those with weak ones. The authors judged the effect comparable to well-known risks such as smoking and alcohol, and larger than the effect of physical inactivity or obesity in the studies they compared (5). The U.S. Surgeon General has since called loneliness an epidemic, comparing the mortality risk of social disconnection to smoking up to 15 cigarettes a day (6). That comparison is a translation of risk size, not a claim that loneliness and tobacco work the same way. Social isolation is also one of the 14 modifiable risk factors for dementia identified by the 2024 Lancet Commission, accounting for about 5 percent of cases in their model (7).
Connection doesn’t require a big social calendar. It’s the spouse you talk with over dinner, the neighbor you help with a fence, the friends at church, the customers who come to pick up plants, the grandchildren you call. What matters most is having people you can count on, and who count on you.
If this pillar slips. Isolation raises the risk of depression, faster cognitive decline, and earlier death. It also removes the person who would notice that you stopped eating, or that your gait changed. The other failure is forced sociability. A draining crowd is not the same as a reliable friend. Quality beats a full calendar.
Ways to build it: schedule regular time with friends and family; join a group built around something you enjoy, such as a garden club, congregation, or volunteer crew; reach out first instead of waiting to be invited; and treat a growing sense of isolation as a health problem worth addressing, because it is.
Pillar 6. Purpose: a reason to get up, including spiritual life
Why get up in the morning? Researchers have taken that question surprisingly seriously.
In a study of nearly 7,000 Americans over 50, a stronger sense of purpose in life was significantly associated with lower risk of death from all causes, and from heart and circulatory disease in particular (8). People with a sense of purpose may simply take better care of themselves, and a recent analysis suggests some of the link reflects the fact that healthier people find it easier to feel purposeful (9). Even so, purpose consistently shows up alongside better health, mood, and sleep.
For many people, purpose is bound up with spiritual life, whether that’s religious faith, prayer, meditation, or a deep connection to nature and something larger than themselves. In the Harvard Nurses’ Health Study, women who attended religious services more than once a week had a 33 percent lower risk of death over 16 years than those who never attended, after adjustment for major lifestyle factors (10). Part of that was social support, less depression, and less smoking. It is an association, not proof that attendance itself extends life. Whatever your beliefs, the common threads are community, meaning, gratitude, and a perspective that helps carry us through hard times.
If this pillar slips. Retirement, grief, and an empty calendar are common doors into this one. Without a reason to get up, the other habits lose their point, and depression fills the gap. The pitfall is borrowing someone else’s purpose and calling the mismatch a moral failure. A garden, a congregation, a grandchild, and a research question are all legitimate. So is a season of not knowing, if you keep one small duty.
Ways to build it: volunteer; mentor or teach what you know; care for a garden, an animal, or a piece of land; take part in a faith or meditative practice that speaks to you; and think about what you want your later years to be for, not just how long they’ll last.
I’ve found that working this land, sharing what we learn on our channel and this website, and writing have given my own life a strong sense of purpose, especially since retiring from veterinary practice.
Pillar 7. Toxic load: no smoking, little or no alcohol, then fewer everyday chemicals
Some frameworks call this “detoxification.” I prefer to think of it as reducing what our bodies have to detoxify in the first place, because the body already has an excellent detox system: the liver, the kidneys, the gut, the lungs, and molecules like glutathione. Our job is to support that system and not overload it, not to buy “detox” teas or cleanses, which have no good evidence behind them. This is also the lifestyle-medicine pillar my original five left out. They call it avoidance of risky substances. I keep the wider exposures in the same pillar, but not at the same rank.
Avoid the big three. Not smoking or vaping, avoiding binge drinking, and avoiding misuse of opioids and other drugs were among the eight habits in the veterans study. Smoking and opioids were in the top tier of risk (2). On alcohol, the World Health Organization said in 2023 that no level of drinking is safe for health, largely because of cancer risk (11). The Harvard lifestyle study, by contrast, counted moderate drinking as one of the low-risk habits (1). I don’t think those cancel each other. Alcohol is a dose-dependent carcinogen, and heavy drinking is unambiguously harmful. If there is a small heart benefit at very low doses, it is not a reason to start, and less is better than more. If you don’t drink, that is not a deficiency.
Lower everyday exposures. Much of this series has been about the quieter exposures: PFAS and microplastics in water, disinfection byproducts, chemicals in cookware and food storage, pesticide residues on produce, contaminated supplements, and persistent herbicides in compost. Air pollution is one of the 14 modifiable risk factors for dementia (7). None of these needs to cause fear. Small, steady changes add up. The pitfall is the cleanse industry, and the anxiety that treats every plastic fork as an emergency. Fear is its own exposure.
If this pillar slips. Tobacco remains the clearest voluntary way to shorten a life and to spend the last years of it short of breath. Binge drinking injures liver, heart rhythm, sleep, and judgment. Opioid addiction was one of the three largest risks in the veterans data. Everyday chemicals are slower and smaller. They still belong on the list, behind the big three, not instead of them.
Pillar 8. Hearing: protect it, test it, and treat the loss
This is the pillar I would once have filed under preventive care, or skipped. I don’t get to skip it. I’m losing some hearing, and the research says untreated loss is not a social inconvenience. It is one of the larger modifiable risks to the brain.
The 2024 Lancet Commission on dementia found that untreated hearing loss in midlife is the single largest of its 14 modifiable risk factors, about 7 percent of cases in their model. The same report added untreated vision loss. Together with less education and social isolation, hearing loss sits near the top of what a person can still change (7). The likely paths are not mysterious. You miss the edge of the conversation. You stop going. The brain gets less signal. Isolation, which is its own pillar, gets worse.
The treatment evidence is more careful than the headlines. In the ACHIEVE trial, nearly 1,000 adults aged 70 to 84 with hearing loss were randomized to a hearing intervention or to health education and followed for three years. In the whole group, hearing aids did not slow cognitive decline. In the prespecified higher-risk group, drawn from a long-running heart-health study, the hearing intervention cut the rate of cognitive decline by almost half (12). That is a real signal in the people who needed it most. It is not proof that a hearing aid prevents dementia in everyone. Communication did improve across the treated group, which is reason enough.
If this pillar slips. The disadvantage is not only missed birdsong. It is dropped conversations, a withdrawal you can mistake for personality, and a higher dementia risk that is still treatable at the hearing-aid stage. Loud tools, loud music, and a lifetime of engines do this slowly. Waiting until you cannot hear a grandchild is how the other pillars get quieter too. Vision belongs in the same conversation. The Lancet Commission added untreated vision loss in 2024. I have not made it a tenth pillar. Get the eyes checked. Cataracts and the wrong prescription are fixable, and an unfixed visual loss pushes people indoors and out of company.
Ways to build it: protect your ears from loud noise, including the equipment that makes a homestead run; get a hearing test instead of guessing; use hearing aids if you need them, and give them the weeks it takes to adapt; and treat a growing habit of asking people to repeat themselves as a health finding, not a nuisance.
Pillar 9. Preventive care: checkups, screenings, and someone else’s eyes
Many of the biggest threats to healthy aging, like high blood pressure, high cholesterol, prediabetes, and early cancers, cause no symptoms until they’re advanced. Routine checkups and the screenings recommended by the U.S. Preventive Services Task Force, such as blood pressure, cholesterol, colorectal cancer, and others based on your age and sex, catch problems while they’re still easy to treat (13). Don’t forget dental checks. Adult vaccines recommended for your age belong in the same folder. Hearing and vision now have their own pillar, but the appointment still lives here. And listen to your body: a new symptom that doesn’t go away deserves attention, not a shrug.
This is the clinical pillar, not another behavior. The Harvard and veterans studies did not count a checkup as a lifestyle factor. Silent disease is still how a good habit list ends in a stroke.
If this pillar slips. High blood pressure can take vision, kidneys, and brain before it takes a day off work. A polyp found at colonoscopy is a nuisance. The same polyp found five years later can be a cancer. Dental infection is not a separate kingdom from the rest of the body. The pitfall on the other side is testing without a question: full-body scans and unneeded panels that find incidental noises and lead to procedures. Screening is a tool. It is not a hobby.
Also worth building into your life
These don’t get their own number. Thirteen pillars is a catalog. Nine is a frame. The evidence for each of these is still strong enough to weave through the nine.
Time in nature and daylight. In a study of nearly 20,000 people in England, those who spent at least 120 minutes a week in nature were significantly more likely to report good health and high well-being than those who spent no time there, and the benefit leveled off above about 200 to 300 minutes (14). It didn’t matter whether the time came in one long walk or several short visits. Morning daylight also anchors the body’s internal clock, which helps sleep and mood. The cost of skipping it is flatter mood, worse sleep timing, and a life lived entirely indoors. The cost of overdoing sun, without shade or a shirt, is skin cancer. Both are true.
Caring for your microbiome. We’re not just ourselves. Each of us is an entire ecosystem. Trillions of bacteria and other microbes live in our gut, and they help digest fiber, make vitamins and anti-inflammatory compounds, train the immune system, and even send signals to the brain. A diverse gut community is generally a healthier one, and diet shapes it more than almost anything else. In the American Gut Project, people who ate more than 30 different plant foods a week had more diverse gut microbiomes than those who ate 10 or fewer (15). So aim for variety: vegetables, fruits, beans, whole grains, nuts, seeds, herbs, and fermented foods like sauerkraut and kimchi, and go easy on the ultra-processed foods and unnecessary antibiotics that disrupt it. The slip here is a narrow diet plus repeated antibiotics for viral colds.
The soil has a microbiome too, and we may benefit from touching it. Researchers found that a harmless soil bacterium, Mycobacterium vaccae, activated serotonin-producing neurons in the brains of mice and produced effects similar to antidepressants (16). That’s early animal research, not proof, but it fits something I’ve felt all my life: putting my hands in the soil is therapy for me.
A curious, active mind. The Lancet Commission estimates that about 45 percent of dementia cases could be prevented or delayed by addressing those 14 modifiable risk factors, and it recommends staying cognitively active throughout life (7). Learning a skill, reading, music, games, and meaningful work all count, especially when they’re social. The slip is retirement into pure passive screens. Television is not a cognitive rehab program.
Keeping the numbers in range. Blood pressure, blood sugar, LDL cholesterol, and body weight are the quiet drivers behind heart disease, stroke, diabetes, and dementia. High LDL was one of the two risk factors the Lancet Commission added in 2024. These numbers are where the lifestyle pillars and preventive care meet: habits move them, and checkups tell you whether they’ve moved enough. Letting them drift because you feel fine is how strokes and kidney disease arrive without a warning label.
How the pillars hold each other up
The pillars aren’t separate projects. They lean on each other, which is both the challenge and the opportunity.
Poor sleep raises stress hormones, increases appetite for junk food, and saps the energy to exercise.
Exercise improves sleep, lowers stress, and helps keep blood pressure, blood sugar, and weight in range.
Friends make exercise more likely, cushion stress, and give us reasons to stay healthy.
Untreated hearing loss makes connection harder, and connection lost makes cognitive decline faster.
Purpose gives us the motivation to do all of it.
A whole-food diet supports energy, mood, and the body’s own detoxification.
Skipped checkups let a fixable number become a disease the habits can no longer undo alone.
That’s good news, because it means improving one pillar tends to lift the others. It is also the trap: a collapse in sleep, hearing, or connection can take two other pillars with it.
How to start. Don’t try to overhaul everything at once. Pick the pillar that’s weakest for you, choose one small, specific change, and attach it to something you already do: a 20-minute walk after lunch, lights out at the same time each night, a weekly call to an old friend, a hearing test you have been putting off. When it becomes routine, add the next. The veterans study found that even one or two healthy habits brought meaningful gains, and that it’s never too late to start (2).
Our own honest assessment
I said at the start that I’m not all the way there yet, and I meant it. Here’s how Thea and I measure up.
Pillar | Where we stand
Nutrition | A strength. Much of what we eat we grow ourselves, and what we don’t grow, we try to buy as the most nutrient-dense, organic whole foods we can find.
Movement | Strong most of the year from outdoor work; weaker in winter, when I sit too much at the computer.
Sleep | My biggest challenge. Better than it was, but still short of seven hours.
Stress | Manageable, though busy seasons and big projects still pile up.
Connection | My weakest pillar on paper (more below).
Purpose | A strength: the land, the channel, the writing.
Toxic load | A strength, and the subject of much of this series.
Hearing | A new weak spot. I’m losing some, and this pillar is here because of that.
Preventive care | Good on monitoring, imperfect on doctor visits (more below).
Preventive care. I’ve had high blood pressure for several years, and I take losartan to control it. Thea and I check our blood pressures regularly at home and keep a record, and we pay close attention to our own health. I’ll also admit that there have been times when an ordinary person should have gone to the doctor and I didn’t, because my medical background told me what the treatment would be. When I had a mild concussion recently, for example, I knew the treatment was rest and giving my brain time to recover, and that’s what I did. That approach has served me reasonably well, but I wouldn’t recommend it to readers without medical training. Some problems, a head injury among them, have warning signs that only an exam can rule out, and even doctors need someone else’s eyes on them sometimes.
Hearing. I’m not going to dress this up. I’m losing some hearing, and a man who has spent his life around equipment does not get to act surprised. The research I just cited is the reason it is a pillar and not a footnote. A test and, if I need them, aids are the honest next step. Waiting until conversations are already hard is how this one steals the connection pillar on the way out.
Connection. This is where I struggle. Many people thrive on a full social calendar; I don’t. I’m a homebody, and I’ve always felt like a square peg in a round world, as I’ve described in my memoir, Before I Could Read. Most of my social contact comes through our YouTube channel and the people who write to us there. My deepest connection is with the natural world: walks in our forest, work in the food forest, and hours spent watching the wildlife on our property and trying to understand how each species fits in.
I don’t think the research means everyone has to become outgoing. What seems to matter most is having a few people you can count on and who count on you, and not feeling alone. For me, that starts with Thea. It also reminds me that for quieter people, connection can come through shared purpose rather than socializing for its own sake: answering a viewer’s question, helping a neighbor, teaching someone what we’ve learned about the land. That’s a pillar I can strengthen in my own way. Hearing loss makes that work harder if I ignore it.
Writing this series has been as much for me as for you. It’s shown me that my winter routine, my sleep, my hearing, and my connections with people are where I can gain the most.
Where we land
The nine pillars, as I now see them:
Nutrition: whole, minimally processed foods, plants and fiber first.
Movement: 150 minutes a week of aerobic activity, strength work twice a week, balance, and less sitting.
Sleep: seven or more hours of restorative sleep, on a regular schedule.
Stress: lower the chronic load that keeps stress hormones high.
Connection: people you can count on, and who count on you.
Purpose: a reason to get up in the morning, including spiritual life.
Toxic load: no smoking, little or no alcohol, then fewer everyday chemical exposures.
Hearing: protect it, test it, and treat the loss. Vision rides along.
Preventive care: checkups, recommended screenings, and someone else’s eyes when it matters.
And woven through them: time in nature and daylight, a diverse and well-fed microbiome, a curious mind, and healthy numbers.
No one does all of this perfectly, including me. But every pillar you strengthen adds to the chance of a long life that stays worth living, and it’s never too late to begin.
References
Li Y, Schoufour J, Wang DD, et al. Healthy lifestyle and life expectancy free of cancer, cardiovascular disease, and type 2 diabetes: prospective cohort study. BMJ. 2020;368:l6669. bmj.com
Nguyen X-MT, et al. Eight lifestyle factors and life expectancy in the Million Veteran Program. Presented at NUTRITION 2023. VA release: eurekalert.org
U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans. health.gov
Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. Journal of Clinical Sleep Medicine. 2015. PMC
Holt-Lunstad J, Smith TB, Layton JB. Social relationships and mortality risk: a meta-analytic review. PLoS Medicine. 2010;7(7):e1000316. plos.org
Office of the U.S. Surgeon General. Our Epidemic of Loneliness and Isolation: The U.S. Surgeon General’s Advisory on the Healing Effects of Social Connection and Community. 2023. hhs.gov
Livingston G, Huntley J, Liu KY, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. The Lancet. 2024;404(10452):572-628. thelancet.com
Alimujiang A, Wiensch A, Boss J, et al. Association between life purpose and mortality among US adults older than 50 years. JAMA Network Open. 2019;2(5):e194270. PMC
The importance of baseline health in linking life purpose to longevity. 2026. PubMed
Li S, Stampfer MJ, Williams DR, VanderWeele TJ. Association of religious service attendance with mortality among women. JAMA Internal Medicine. 2016;176(6):777-785. JAMA
World Health Organization Regional Office for Europe. No level of alcohol consumption is safe for our health. January 2023. who.int
Lin FR, Pike JR, Albert MS, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. The Lancet. 2023;402(10404):786-797. thelancet.com
U.S. Preventive Services Task Force. A and B Recommendations. uspreventiveservicestaskforce.org
White MP, Alcock I, Grellier J, et al. Spending at least 120 minutes a week in nature is associated with good health and wellbeing. Scientific Reports. 2019;9:7730. nature.com
McDonald D, Hyde E, Debelius JW, et al. American Gut: an open platform for citizen science microbiome research. mSystems. 2018;3(3):e00031-18. asm.org
University of Bristol. Getting dirty may lift your mood (Lowry CA, et al. Neuroscience. 2007;146:756-772). April 2007. bristol.ac.uk
