Rice accounts for 80% of the calories eaten in Asia, or one-fifth of the calories eaten worldwide by humans. It is the agricultural commodity with the third-highest worldwide production (rice, 741.5 million tonnes in 2014), after sugarcane (1.9 billion tonnes) and maize (1.0 billion tonnes). However, judged by value, the world trade in wheat is greater than all other crops combined. All these cereals are grasses. 