Does eating fruits and vegetables make people happy, or do happy people choose to eat fruits and vegetables, that is the question. The answer, from researchers at Warwick University, is “more research is needed.” What is known by the researchers, who studied the eating habits of 80,000 people in Britain, is that mental wellbeing appeared to rise with the number of daily portions of fruit and vegetables that people ate. Wellbeing peaked at seven portions a day. A University of Warwick news release reports that “much remained to be learned about cause-and-effect and about the possible mechanisms at work, and that randomized trials should now be considered.” Read a pdf of the study at Futurity.org.