Can your diet make you happy?
It’s one thing to say that our diet might protect us from depression and other mental health issues. But could the foods we eat actually move the needle toward more positive emotions and happiness?
In an experiment published in PLoS ONE, researchers recruited 171 young adults with a diet low in fruits and vegetables, which meant three or fewer servings per day. These 18 to 25 year olds were split into groups: One got a basket of carrots, apples, and kiwi or oranges and was told to eat an extra serving of fruit and an extra serving of vegetables per day; another didn’t change what they ate.
Every day for two weeks, they answered questions about their feelings, mood, and happiness. At the beginning and the end of the experiment, they also filled out surveys about their anxiety and depression.
The diet group only managed to add one extra serving of fruit and vegetables to their daily diet. But that made a difference: Compared to everyone else, they had more energy, curiosity, creativity, and motivation; and they felt more engaged and purposeful in their lives overall—a greater sense of flourishing.
Surprisingly, though, the diet didn’t seem to change their mood or their feelings of depression and anxiety. That might be because the experiment was so short, the authors believe; while diet can give us a positive boost pretty quickly, it’s possible that mental health problems take longer to show up.
“The accumulation of factors such as low vitality, reduced motivation, and poorer socio-emotional flourishing may precipitate the development of psychological ill-being over time,” write researcher Tamlin S. Conner and her colleagues.
Similarly, in a short pilot study from 2011, a Mediterranean diet seemed to boost people’s feelings of contentment—but didn’t improve their depression or anxiety.
Twenty-five women were surveyed on their feelings of depression, anxiety, anger, calm, and contentment. Some continued eating as usual for 10 days, while the rest adopted a Mediterranean diet (this time with no red meat). After another round of surveys, the researchers found that the women on the Mediterranean diet felt more content.
“The nutrients consumed in everyday diets are important for individuals’ mood,” write Laura McMillan and her colleagues.

Of course, this was a very small study—and the women may have simply felt satisfied about doing something good for their health. Indeed, in a few other studies, a healthy diet didn’t make people happier. For example, following a Mediterranean diet for 12 weeks didn’t seem to boost people’s mood, well-being, or sense of self-efficacy compared to receiving social support.
Despite how catchy it sounds, it might be too early to say that any particular diet is going to bring us happiness.
Can your diet make you happy?
It’s one thing to say that our diet might protect us from depression and other mental health issues. But could the foods we eat actually move the needle toward more positive emotions and happiness?
In an experiment published in PLoS ONE, researchers recruited 171 young adults with a diet low in fruits and vegetables, which meant three or fewer servings per day. These 18 to 25 year olds were split into groups: One got a basket of carrots, apples, and kiwi or oranges and was told to eat an extra serving of fruit and an extra serving of vegetables per day; another didn’t change what they ate.
Every day for two weeks, they answered questions about their feelings, mood, and happiness. At the beginning and the end of the experiment, they also filled out surveys about their anxiety and depression.
The diet group only managed to add one extra serving of fruit and vegetables to their daily diet. But that made a difference: Compared to everyone else, they had more energy, curiosity, creativity, and motivation; and they felt more engaged and purposeful in their lives overall—a greater sense of flourishing.
Surprisingly, though, the diet didn’t seem to change their mood or their feelings of depression and anxiety. That might be because the experiment was so short, the authors believe; while diet can give us a positive boost pretty quickly, it’s possible that mental health problems take longer to show up.
“The accumulation of factors such as low vitality, reduced motivation, and poorer socio-emotional flourishing may precipitate the development of psychological ill-being over time,” write researcher Tamlin S. Conner and her colleagues.
Similarly, in a short pilot study from 2011, a Mediterranean diet seemed to boost people’s feelings of contentment—but didn’t improve their depression or anxiety.
Twenty-five women were surveyed on their feelings of depression, anxiety, anger, calm, and contentment. Some continued eating as usual for 10 days, while the rest adopted a Mediterranean diet (this time with no red meat). After another round of surveys, the researchers found that the women on the Mediterranean diet felt more content.
“The nutrients consumed in everyday diets are important for individuals’ mood,” write Laura McMillan and her colleagues.

Of course, this was a very small study—and the women may have simply felt satisfied about doing something good for their health. Indeed, in a few other studies, a healthy diet didn’t make people happier. For example, following a Mediterranean diet for 12 weeks didn’t seem to boost people’s mood, well-being, or sense of self-efficacy compared to receiving social support.
Despite how catchy it sounds, it might be too early to say that any particular diet is going to bring us happiness.
