Adding just one extra serving of fruit and veg boosts mental health

A longitudinal study appropriately titled “Lettuce be happy” found that increased fruit and vegetable consumption can enhance mental well-being.

While the role of a healthy diet in influencing physical health has been well established, say the authors, the new research indicates that an increase in frequency and quantity of fresh produce can make you happier and give your mental health a boost.

According to TLC, the study from Leeds and York Universities in the UK analysed data from more than 40,000 people during a seven year period. The researchers found that when there was an increase in fruits and vegetables in the participants’ diets, they reported better moods.

A key feature of this work is that the study was able to follow the same individuals over time.

The study also controlled for alternative factors that may affect mental well-being, such as age, education, income, marital status, employment status, lifestyle and health, as well as consumption of other foods such as bread or dairy products.

The research showed a positive association between the quantity of fruit and vegetables consumed and people’s self-reported mental well-being.

Specifically, the findings indicate that eating just one extra portion of fruits and vegetables a day could have an equivalent effect on mental well-being as around 8 extra days of walking a month (for at least 10 minutes at a time).

Dr Neel Ocean from the University of Leeds authored the study with Dr Peter Howley, also from Leeds University Business School, and Dr Jonathan Ensor from the University of York.

It’s well-established that eating fruit and vegetables can benefit physical may also benefit psychological well-being Dr Neel Ocean

Commenting on the study, Dr Ocean said: “It’s well-established that eating fruit and vegetables can benefit physical health.

“Recently, newer studies have suggested that it may also benefit psychological well-being. Our research builds on previous work in Australia and New Zealand by verifying this relationship using a much bigger UK sample.

People who do eat more fruit and vegetables report a higher level of mental well-being. Dr Neel Ocean

“While further work is needed to demonstrate cause and effect, the results are clear: people who do eat more fruit and vegetables report a higher level of mental well-being and life satisfaction than those who eat less.”

Dr Howley said: “There appears to be accumulating evidence for the psychological benefits of fruits and vegetables.

“Despite this, the data show that the vast majority of people in the UK still consume less than their five-a-day.

“Encouraging better dietary habits may not just be beneficial to physical health in the long run but may also improve mental well-being in the shorter term.”

Dr Ensor added: “This work is part of a broader project between our universities known as “IKnowFood”.

As well as investigating consumer behaviour and wellbeing, IKnowFood is exploring how farmers in the UK, and businesses across the global food supply chain, can become more resilient in the face of growing uncertainty in markets, regulation and the natural environment."

‘Lettuce be happy: The longitudinal relationship between the consumption of fruits and vegetables and well-being in the UK’ is currently in press at the journal Social Science and Medicine, and is available online.

IKnowFood is funded through the Global Food Security's “Resilience of the UK Food System Programme” with support from BBSRC, ESRC, NERC and Scottish Government.

For further information contact Guy Dixon, University of Leeds press office on 01133 434 031 or email

Access the paper here.