Interestingly, eating five portions of fruits and four portions of vegetables daily was enough to reach the peak of happiness.
For the study, researchers from the University of Queensland looked at 12,000 people, aged between 15 and 93, as part of the annual Household, Income, and Labour Dynamics Australia (HILDA) Survey. The participants answered questions related to their lifestyle, eating habits and health - both mental and physical. They also rated their level of happiness and also provided details about the total daily intake of fruits and vegetables.
Women benefitted the most from eating fruits and vegetables. Including more fruits to the daily diet provided the best psychological effects than vegetables.
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Source material from International Business Times