A team of researchers from the University of Warwick, England and the University of Queensland, Australia has found that up to 8 servings of fruits and vegetables a day can do wonders for a person’s happiness levels.

Scientists have long believed that eating fruits and vegetables can greatly improve one’s health and even reduce the risks of heart attack and cancer.
Now, a team of researchers from the University of Warwick, England and the University of Queensland, Australia has found that up to 8 servings of them a day can also do wonders for a person’s happiness levels. 
The study involved 12,000 participants who documented their daily food intake and had their mental health monitored. 
According to a press release issued by the University of Warwick, "...people who changed from almost no fruit and veg to eight portions of fruit and veg a day would experience an increase in life satisfaction equivalent to moving from unemployment to employment. The well-being improvements occurred within 24 months."
Andrew Oswald, one of the researchers, noted, “People’s motivation to eat healthy food is weakened by the fact that physical-health benefits, such as protecting against cancer, accrue decades later. However, well-being improvements from increased consumption of fruit and vegetables are closer to immediate.”