Counting Your Blessings: What Science Says About Gratitude

By Claude AI, Assistant Publisher

Once a year, Americans sit down to a holiday built around giving thanks. Then most of us spend the other 364 days complaining about traffic, prices, politicians, and the guy who took our parking spot. It turns out that's a missed opportunity. Over the past two decades, researchers have studied gratitude in ways that would have surprised our grandparents, and the results suggest that counting your blessings does more than make you a pleasant dinner guest. It may help you sleep better, feel better, and even take better care of your body.

Here's what the science actually shows, and what it doesn't.

The Study That Started It

In 2003, psychologists Robert Emmons of the University of California, Davis, and Michael McCullough, then at the University of Miami, ran a simple experiment. They split volunteers into three groups. Once a week for ten weeks, one group wrote down five things they were grateful for. A second group listed hassles that had annoyed them. A third simply recorded events from the week.

At the end, the gratitude group stood out. Compared with the others, they rated their lives more positively, were more optimistic about the coming week, reported fewer physical complaints, and exercised more regularly. Writing down a few good things once a week, in other words, seemed to spill over into how people lived.

That study launched a whole field. In follow-up work, Emmons found that people who kept gratitude lists made more progress toward their personal goals, felt more alert and energetic, and were more likely to help others with a problem.

Gratitude and Sleep

One of the most consistent findings involves sleep. In one of Emmons' studies, adults with neuromuscular disease who kept a gratitude journal for three weeks reported sleeping longer and better than a comparison group. British researchers led by Alex Wood reached a similar conclusion in 2009: more grateful people tended to fall asleep faster and sleep better.

The likely reason is what goes through your mind as you lie in bed. If your last thoughts of the day are worries and grudges, your body stays on alert. If they're about what went right, you relax. That's why many sleep experts now suggest a short gratitude list as part of a bedtime routine.

The Body Connection

Gratitude also appears to work on the nervous system. Like meditation, which we covered in September, focusing on what you're thankful for tends to calm the body's fight-or-flight stress response and engage the "rest and digest" side of the nervous system, the one that slows the heart and lowers stress hormones.

Some studies have found links between gratitude practices and lower blood pressure, healthier heart rhythms, and lower markers of inflammation, including one 2015 study of patients with heart failure who kept gratitude journals for eight weeks. These studies tend to be small, though, so they're best seen as promising rather than proven.

The Brain Connection

Brain-scan research has added another piece to the puzzle. In one study, people who wrote gratitude letters showed greater activity in parts of the brain linked to appreciation and decision-making when they were tested months later. Gratitude, the researchers suggested, may be a little like a muscle: the more you practice it, the stronger it gets.

The Gratitude Visit

Perhaps the most famous single exercise comes from Martin Seligman, the University of Pennsylvania psychologist known as the father of positive psychology. In his "gratitude visit," you write a letter to someone who made a difference in your life but whom you never properly thanked, then deliver it in person and read it aloud.

In Seligman's research, it produced the biggest immediate boost in happiness of any exercise tested. The catch: the effect faded after about a month. That points to the most important lesson in the gratitude research. It's a habit, not a one-time fix.

What the Science Doesn't Say

Honesty requires a few caveats.

• The effects are real but modest. Reviews that pool many studies together have found that gratitude exercises produce small improvements in mood, and their effect on depression and anxiety is modest. Gratitude isn't a substitute for treatment when someone is truly struggling.
• It can't be forced. Being told to "just be grateful" when life is going badly can backfire and feel dismissive. Gratitude works best as a practice you choose, not a lecture you receive.
• Grateful people may differ in other ways. Some studies compare people who are naturally grateful with those who aren't, and those groups may differ in many other ways, from health to income to personality.
• More isn't always better. Interestingly, one study by psychologist Sonja Lyubomirsky found that counting blessings once a week worked better than doing it three times a week, perhaps because frequent lists become a chore and lose their meaning.