Looking at the health effects on the Friends of the Earth / Compassion in World Farming diets by authors from British Heart Foundation Oxford University.It analyses the health science around eating more fruit and veg and lees meat.The behavioral change needed is identified.
http://www.publichealth.ox.ac.uk/bhfhprg/publicationsandreports/publications/bhfhprgpublished/friendsoftheearthreport