Evolution and determinants of subjective well-being in the French general population between 2014 and 2023
This study of the French population from 2014 to 2023 reveals that while sociodemographic factors shape baseline well-being, acute symptom burden is the primary determinant of subjective well-being, with overall scores notably increasing during the pandemic period despite seasonal fluctuations driven largely by illness frequency.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Human beings have long sought to understand what makes life feel good. While philosophers once debated happiness in abstract terms, modern science has turned this question into something measurable, asking people to rate their own sense of well-being on a simple scale. This concept, known as subjective well-being, is more than just a fleeting mood; it is a complex mix of how satisfied we feel with our lives, the balance of our positive and negative emotions, and our general sense of purpose. For decades, researchers have known that money, social connections, and education play a role in these feelings. However, a specific gap remained in our understanding: how do sudden waves of sickness, like the seasonal flu or a global pandemic, change the way a whole population feels about their lives? Does the calendar itself, with its cold winter months, make people feel worse, or is it simply the fact that people get sick more often during those times?
To answer these questions, a team of researchers in France looked at a massive, decade-long record of how people felt. They did not rely on a one-time survey or a small group of volunteers. Instead, they tapped into a unique system called Grippenet, a digital network where thousands of French citizens voluntarily report their health every week. Since 2014, these participants have answered a simple question: "Overall, how are you feeling?" They rate their answer on a scale from zero to one hundred. Alongside this rating, they report if they have symptoms like a cough or fever, and how many symptoms they have. By tracking nearly 16,000 unique individuals over nine winter seasons, from 2014 through 2023, the researchers were able to watch the ebb and flow of national mood as it moved through normal years, the height of the COVID-19 pandemic, and the period after the health emergency ended.
The most striking discovery was that the number of symptoms a person has is by far the biggest driver of how they feel. When a participant reported no symptoms, their well-being score was consistently high, often hovering around the low 90s. But the moment symptoms appeared, that score dropped sharply. The more symptoms a person reported, the lower their score fell. Those with just one or two symptoms saw a noticeable dip, while those with more than five symptoms saw their scores plummet by nearly forty points compared to healthy days. This relationship was so strong that it explained almost everything about why well-being scores changed from week to week. The researchers found that the apparent drop in happiness during winter months was not because the cold weather or short days directly made people feel sad. Instead, it was simply because more people were sick during those months. When the researchers looked only at people who had no symptoms at all, the winter drop almost disappeared, leaving only a tiny, barely noticeable effect of the season itself.
Perhaps the most surprising finding concerned the years of the COVID-19 pandemic. Conventional wisdom might suggest that a global health crisis would cause well-being to crash. Yet, the data showed the opposite. During the pandemic years, and even in the year immediately following the official end of the health emergency, the average well-being scores of the French population were higher than they had been in the years before the virus arrived. The researchers suggest this counterintuitive rise happened for a few reasons. First, strict measures like lockdowns and mask-wearing stopped the spread of many other respiratory viruses, meaning fewer people were suffering from the flu or other common illnesses that usually drag down well-being scores. Second, the people who continued to fill out the weekly surveys during the pandemic may have been a healthier, more motivated group than those who dropped out, which could have skewed the average upward. It is also possible that for those who were not infected, the changes in daily life, such as less commuting and altered work routines, offered a temporary sense of relief.
Beyond the impact of sickness and the pandemic, the study confirmed that who you are shapes your baseline level of happiness. Men reported slightly higher well-being scores than women, and people with higher levels of education felt better than those with less education. Retirement was also linked to higher scores, while having chronic health conditions or smoking was linked to lower scores. Interestingly, the researchers found that where a person lived in terms of wealth and poverty did not show a strong link to well-being once other factors like education and job status were taken into account. This suggests that while money matters, the daily experience of health and the social environment might be more immediate drivers of how people feel.
The study concludes that while the seasons and the broader social context set the stage, the immediate physical state of a person is the most powerful force in their daily sense of well-being. The winter blues, often blamed on the weather, are largely a reflection of winter sickness. The pandemic, despite its terror, coincided with a period where the general population reported feeling better, largely because the usual cycle of seasonal illness was broken. This research highlights that to improve the well-being of a population, the most effective strategy might be the simplest: keeping people healthy and free from acute symptoms. By using a system where people report their own feelings in real time, scientists can now see these patterns clearly, offering a new way to monitor the emotional health of a nation alongside its physical health.
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