What Are the Best Habits for Longevity?

Ask the internet for the best habits for longevity and you’ll get a morning routine with more steps than a flat-pack wardrobe: a cold plunge, a red light, a fistful of capsules. Humanic Blue looked to US public-health agencies, whose list is a lot less photogenic.

Pieced together from the CDC, the National Institute on Aging, the federal activity guidelines, the Surgeon General and the Preventive Services Task Force, it goes like this: don’t use tobacco, move regularly and strengthen your muscles twice a week, eat a varied, nutrient-dense diet, sleep seven to nine hours, stay connected to other people and keep up with preventive care. In a Harvard analysis of more than 120,000 US nurses and health professionals, people with five healthy habits were projected to live 12 to 14 years longer from age 50 than people with none. That’s an estimate from observational data, not a guarantee, and every body starts from a different place.

What matters about tobacco and alcohol?

The first rung of this ladder is taking things away. The US Centers for Disease Control and Prevention says quitting smoking reduces the risk of premature death “and can add as much as 10 years to life expectancy.” It also lowers the risk of heart disease, chronic obstructive pulmonary disease (COPD, a group of lung conditions that make breathing difficult) and cancer, and the CDC says it helps “at any age,” even after many years of heavy smoking.

That 10 years is a population figure, not a personal forecast. Earlier quitting brings bigger gains, according to the CDC. Counseling, medications and quit-support services are all worth raising with a clinician.

Alcohol gets similar plain treatment. “You can lower your health risks from alcohol by drinking less or not drinking at all,” says the CDC’s alcohol guidance, which also tells non-drinkers not to start “for any reason.” Anyone who drinks heavily should get medical advice before stopping suddenly. The National Institute on Alcohol Abuse and Alcoholism warns that after long, heavy drinking, stopping suddenly can set off “a painful or even potentially life-threatening process of withdrawal,” and advises: “Seek medical help to plan a safe recovery.”

The CDC identifies smoking and alcohol as health risks. Its guidance concerns reducing those risks; the supplement claims discussed below concern benefits that remain unestablished.

When habits stack up

Researchers at Harvard’s T.H. Chan School of Public Health, led by Yanping Li, with nutrition epidemiologist Frank Hu as senior author, tracked about 123,000 US nurses and health professionals for up to 34 years. They counted five low-risk habits: never smoking, a healthy weight, at least 30 minutes a day of moderate-to-vigorous activity, moderate drinking and a high-quality diet.

At age 50, women with all five were projected to live about 14 years longer than women with none; for men the gap was about 12 years. Those with all five had roughly a quarter of the death rate of those with none during the study (Note 1). How the estimate was built

It’s a widely cited attempt to put a number on living longer through everyday habits, and it has real limits. It’s observational, the habits were self-reported, and the participants were mostly white health professionals. It also counted moderate drinking as a healthy habit, which the CDC’s current guidance no longer supports.

What separates the study's modeled life-expectancy differences from a promise about any one routine?

Move, and strengthen

The federal Physical Activity Guidelines for Americans ask adults for 150 to 300 minutes of moderate activity a week, such as brisk walking or fast dancing, or 75 to 150 minutes of vigorous activity. They add muscle-strengthening work on two or more days, and balance training for older adults. Their first advice for adults: move more and sit less.

These numbers are a target, not an entry exam. “Some physical activity is better than none,” the guidelines say, and people starting from nothing should “start low and go slow.” Weights, machines, bands and push-ups all count as strength work.

The National Institute on Aging links regular activity in older adults with lower risks of heart disease, type 2 diabetes, several cancers, dementia and depression, plus better physical function. “Active older adults also tend to live longer!” the institute adds, exclamation point included. The function benefits come partly from trials; the lifespan comparisons are mostly observational and can be skewed by illness and wealth.

People with chronic conditions or symptoms should be under a health care provider’s care, according to the guidelines, which also say activity can be safe “for almost everyone.” Arthritis, heart disease or disability may change the starting point, not the value of moving. The guideline details

Eat a pattern, not a hero ingredient

The National Institute on Aging calls healthy eating “a cornerstone of healthy aging.” Its tips for older adults are plain: eat a variety of vegetables, fruits, grains, protein foods and dairy, and choose foods that don’t have a lot of sugar, saturated fat and sodium. Kidney disease, diabetes, allergies, medications and access to food can all change what that looks like for one person.

No single food works as a master switch for aging. Nutrition studies that follow people for decades are vulnerable to the “healthy user” problem: people who eat well may also exercise more, smoke less and have more money. Feeding trials can measure blood pressure or cholesterol, but they rarely run long enough to measure lifespan.

How much sleep do adults need?

Adults of every age need about seven to nine hours a night, according to the National Institute on Aging. Over time, it says, too little sleep can raise the risk of high blood pressure, heart disease and diabetes, and poor-quality sleep raises the risk of falls and accidents.

Sleep isn’t only a matter of willpower. The institute lists illness, medications, mental health and pain as common disruptors, and says insomnia, sleep apnea and restless legs syndrome become more common with age. Snoring can be a sign of apnea, and if you suspect apnea, the NIA says to talk to your doctor. Menopause symptoms, caregiving and shift work can also get in the way.

Sleeping more doesn’t automatically mean living longer. Studies linking sleep length to health are observational and can’t show cause and effect, so the practical goal is regular, restorative sleep and treatment of sleep disorders, not a perfect score on a wearable.

Why social connection matters to health

A 2023 advisory from the US Surgeon General says social isolation increases the risk of premature death by 29%. That figure comes from a 2015 review, led by Brigham Young University psychologist Julianne Holt-Lunstad, that pooled observational studies published between 1980 and 2014 (Note 2). The review’s numbers

“Increases” is doing a lot of work there. Loneliness may harm health, but illness, disability and money trouble can also cause isolation. The evidence doesn’t point to one social prescription that adds a fixed number of years.

The Surgeon General treats connection as a public-health issue. The distinction matters: counting contacts alone cannot show whether someone has reliable company or support, or explain barriers such as hearing loss, limited mobility or low mood.

How might illness or limited mobility affect both someone's social contact and the health risks described here?

Which preventive care belongs on the calendar?

Some longevity habits happen once a year, not once a day: blood-pressure checks, vaccines, dental and eye care, medication reviews and age-appropriate screening.

In the US, the Preventive Services Task Force grades screening on the balance of benefits and harms. Its A and B list includes screening for high blood pressure, colorectal cancer, breast cancer, prediabetes and type 2 diabetes, depression, HIV and hepatitis C. Timing depends on age, sex, family history and past results, and other countries use different schedules.

Cost may be less of a barrier than people expect. Most health plans must cover a set of preventive services, such as screening tests, at no cost when you use an in-network provider, according to HealthCare.gov, though it notes that coverage can vary. More on the task force

Screening isn’t automatically helpful. More testing can mean false alarms, anxiety and procedures you didn’t need, which is why the task force weighs harms at all. The task force’s recommendations concern defined groups, rather than testing everyone for everything. An abnormal screening result may need further evaluation before it can establish a diagnosis.

Where supplements fit

Treating a specific nutritional need and claiming to extend life are different uses of a supplement. Evidence for one does not establish the other.

The US Food and Drug Administration says it “is not authorized to approve dietary supplements for safety and effectiveness before they are marketed.” The agency also warns that mixing medications and supplements can endanger your health.

The FDA’s warning does not establish that every supplement is ineffective. It means that being available for sale does not establish a product’s safety or effectiveness, including any claim to extend life.

Make the routine small enough to survive real life

Plenty of diets and books promise new habits in as little as three weeks. A 2021 post on the National Institute on Aging’s research blog puts it at between 46 and 488 days to make sustained behavior change or build a new habit. That wide range does not establish a deadline for forming any one habit.

The agencies do not supply one combined sequence for every adult. The federal activity guidelines say to start low and go slow; the NIA addresses varied eating patterns and sleep problems; the USPSTF defines who is eligible for each screening. Someone recovering from an eating disorder, managing a chronic disease or living with a disability may need different support. Those separate recommendations cannot be turned into a universal six-step routine.