Researchers at the University of Queensland (UQ) in Australia said that eating huge amounts of fruits and vegetables will not only make one healthier but can actually make people happier.

The study, which involved more than 12,000 people, concluded that eating at least eight portions of fruit and vegetables a day improves mental well-being and makes someone feel positive and happy.

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The UQ study dwells into the research on the effects of fruit and vegetable consumption on mental health as most previous studies focused on the benefits of eating fruits and vegetables on physical health.

The study showed that the more people eat fruits and vegetables, the more happy they become, said UQ health economics researcher Dr. Redzo Mujcic.

"It comes up the more you eat the better, but there is also some optimal points. Eating about five fruits and five vegetables [per day] makes us the happiest we can be in that case," he told Australian Broadcasting Corporation (ABC) radio.

Mujcic's study looked at people's choices on fruit and vegetables, and rated these against their levels of satisfaction, stress and vitality.

Meanwhile, China remained the largest market for Vietnamese vegetables and fruits in the first nine months of this year, the Vietnam Customs reported.

From January to September of 2014, China imported US$321.4 million worth of vegetables and fruits from Vietnam, up 37.7 percent year-on-year, accounting for around 27.7 percent of Vietnam's total export revenue of vegetables and fruits.

China was followed by Japan with an import revenue of US$56.2 million, up 20.8 percent year-on-year.

South Korea, the third biggest buyer of Vietnamese vegetables and fruits with a spending of US$43.68 million, witnessed the greatest growth of 97 percent year-on-year.

During the nine months, Vietnam earned US$1.16 billion from exporting vegetables and fruits, up 45.2 percent year- on-year.

Major export items of Vietnamese vegetables and fruits during the period included mango, litchi, banana, dragon fruit and rambutan, reported Bao Cong Thuong.