You probably know the standard advice by now. If you feel off, eat better, move more, sleep more, cut the smoking. Most people assume the same recipe helps whatever is weighing them down.
A new Tulane University study of 277,489 UK adults, published in Nature Communications, puts a number on it.
Men who were both lonely and socially isolated could expect about 5.8 fewer years free from depression and anxiety than their well-connected peers. Women lost about 3.7.
The researchers saw a smaller hit to physical health too. Women lost about 2.4 extra years free of major physical disease. Men lost about 1.7.
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Loneliness and isolation are not the same
The study treats them as two different problems. Social isolation is objective. It is how often you actually see or talk to other people.
Loneliness is subjective. It is the feeling that your relationships are not what you want them to be, even if your calendar looks busy.
The two do not always travel together. You can live alone and feel content. You can be surrounded by people and still feel unseen.
Why healthy habits only reach one of them
Here is the twist the Tulane team flagged. A healthier lifestyle, measured by diet, exercise, sleep and not smoking, narrowed the loss of disease-free years tied to social isolation.
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It did not meaningfully narrow the loss tied to loneliness itself. For the people who feel disconnected, the usual self-care checklist does not seem to touch the thing that is hurting them most.
Lu Qi, the lead author and a professor at Tulane University's Celia Scott Weatherhead School of Public and Tropical Medicine, framed it in a statement reported by Science Daily.
"Overall, the study found that social isolation and loneliness can have a significant impact on disease-free life expectancy," Qi said.
The practical takeaway is that the four pillars of healthy living, diet, exercise, sleep and not smoking, still protect people with few social contacts. For people who feel lonely, the researchers point to real relationships as the intervention that matters most.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.