The study, by Imperial College London, says consuming 10 portions per day, or about 800g, could prevent an estimated 7.8 million premature deaths worldwide.
The World Health Organization (WHO) currently recommends eating 5 portions, or 400g, of fruit and vegetables every day.
In recent years, campaigns in countries across the world including the UK, Germany, France, Norway and Japan have been launched in a bid to encourage people to meet this target.