Five Habits Linked to 12 to 14 More Years of Life, and What the Studies Can and Cannot Say

You have probably seen the headline: five habits, more than a decade of extra life. The number is real. It also needs its fine print.

The study behind the headline

It comes from two long US cohorts, the Nurses' Health Study (78,865 women, followed from 1980) and the Health Professionals Follow-up Study (44,354 men, from 1986). Over up to 34 years, 42,167 of them died (Li 2018, Circulation).

The team counted five low-risk habits:

1. Never smoking
2. A body mass index of 18.5 to 24.9
3. At least 30 minutes a day of moderate to vigorous activity
4. Moderate alcohol intake
5. A diet quality score in the top 40% of the cohort

People with all five had a 74% lower risk of dying during follow-up than people with none. At age 50, women with all five were projected to live 43.1 more years, against 29.0 with none. That is 14 years. For men it was 37.6 against 25.5, about 12 years.

More years, and healthier ones

A longer life is not much of a prize if the extra years are sick ones. A second paper from the same cohorts (Li 2020, The BMJ, 73,196 women and 38,366 men) counted years lived after 50 without diabetes, cardiovascular disease or cancer. Women with four or five habits: 34.4 years. With none: 23.7. Men: 31.1 against 23.5.

It still counts at 75

A Stockholm study followed 1,810 adults aged 75 and older for 18 years (Rizzuto 2012, The BMJ). Half of them lived past 90. Those who regularly swam, walked or did gymnastics died a median 2.0 years later than those who did not. People with a low-risk profile (healthy habits, at least one leisure activity, and a rich or moderate social network) lived a median 5.4 years longer than those with the opposite profile. Among people 85 and older, and among those with chronic conditions, the difference was still four years.

The same list, from other directions

Heart disease. A pooled analysis of 112 cohorts in 34 countries, 1,518,028 people, found that five risk factors (body mass index, systolic blood pressure, non-HDL cholesterol, current smoking and diabetes) accounted for 57.2% of new cardiovascular disease over ten years in women and 52.6% in men (Magnussen 2023, NEJM). The older INTERHEART study compared 15,152 people who had a first heart attack with 14,820 who had not, in 52 countries. Nine factors accounted for 90% of the population risk in men and 94% in women (Yusuf 2004, The Lancet).

Cancer. An American Cancer Society analysis estimated that 40.0% of cancers diagnosed in US adults 30 and older in 2019 were attributable to risk factors that can be changed. Smoking was the largest at 19.3% of cases (Islami 2024, CA: A Cancer Journal for Clinicians). This is a modeling estimate, not a count.

The one that was a trial

Everything above is observational. The Diabetes Prevention Program was not. It randomly assigned 3,234 adults with elevated blood glucose, average age 51, to a lifestyle program, the drug metformin, or placebo (Knowler 2002, NEJM). The lifestyle goals were 150 minutes of activity a week and a 7% reduction in body weight. After 2.8 years, new diabetes was 58% lower in the lifestyle group than with placebo, and 31% lower with metformin. Twenty-one years on, the lifestyle group still had a 24% lower rate, and most of the effect came in the first years.

That trial enrolled people already at high risk and gave them a coached program. It is not evidence about everyone, and it is not a do-it-yourself plan. If your blood sugar is elevated, that is a conversation for your doctor.

About the alcohol line

The cohort studies scored moderate drinking (5 to 15 grams a day for women, 5 to 30 for men) as the low-risk category. That is how they counted it. It is not a reason to start. The same cancer analysis attributed 5.4% of US cancer cases to alcohol.

What to do tonight, with a number

Score yourself from 0 to 5 on the list above. Write the number down with today's date.

Then pick the cheapest point. For most people that is the third one: 30 minutes of moderate activity. A brisk walk counts. Do it tomorrow and write down that you did.

The honest part

Nobody in the cohort studies was assigned to a habit. People who keep all five differ from people who keep none in money, schooling and luck, and statistics cannot remove all of that. The participants were nurses and health professionals. The years of life are projections for groups, built from life tables. They are not a forecast for you.

What the studies do agree on is the list. It is short, it is boring, and INTERHEART had most of it in 2004.

Where HealthBrew fits

A score tells you where you stand. What changes it is what you do on ordinary days. HealthBrew's nightly close takes about a minute and, after a few weeks, shows your pattern. Membership, cancel anytime.

Educational content, not medical advice. Sources, read as PubMed abstracts on 10 November 2026 (we did not read the full papers): Li et al., Circulation, 2018; Li et al., The BMJ, 2020; Rizzuto et al., The BMJ, 2012; Magnussen et al., NEJM, 2023; Yusuf et al., The Lancet, 2004; Islami et al., CA: A Cancer Journal for Clinicians, 2024; Knowler et al., NEJM, 2002, and the program's 21-year follow-up, 2025.