Chart 2 (Crops) (IMAGE) Burness Caption Over the last 50 years, the global diet has shifted dramatically, including greater amounts of major oil crops and lesser quantities of regionally important staples. This chart shows the average change in the calories from crops in national diets worldwide, 1961-2009. Credit <b>Source:</b> Khoury et al. 2014. <em>Proc. Natl. Acad. Sci.</em> USA. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.