Just three servings of fruit and vegetables a day can transform your outlook on life, a new study suggests.
The American study, which appeared in the online journal Psychosomatic Medicine this month, examined the link between healthy eating and life satisfaction levels.
It found that those who ate more fruit and vegetables reported higher levels of optimism and a more positive outlook on life.
The study measured the concentration of carotenoids in the blood streams of participants.
Carotenoids are compounds commonly found in plants, and a diet high in fruit and vegetables means a higher concentration of carotenoids in the blood stream.