Volatile food prices and a growing population mean we have to rethink what we eat, say food futurologists. So what might we be serving up in 20 years’ time, asks BBC News?

• Insects will become a staple of our diet: a great source of protein, cost less to raise than cattle, consume less water and do not have much of a carbon footprint.
• Sonic-enhanced food: certain sounds could make things taste sweeter or more bitter.
• Lab-grown meat: a more efficient and environmentally friendly way of putting meat on our plates.
• Algae can be grown in the ocean, a big bonus with land and fresh water in increasingly short supply, and the biofuel derived from algae could help reduce the need for fossil fuels.