Sudakshina Unnikrishnan from Barclays Capital said China may soon become a "structural" corn importer. While it imported corn in 1994, that was due to bad harvests. This time the cause is a permanent shift towards meat-based diets. This has led to a steady rise in the use of corn for animal feed. More than 70pc of China's corn is now used in feed. It takes about seven kilos of grain to produce one kilo of beef.