Governments may have to persuade people to eat less meat because of increasing demands on water supplies, according to agricultural scientists investigating how the world can best feed itself.
They say countries with little water may choose not to grow crops but trade in "virtual water", importing food from countries which have large amounts of water to save their supplies for domestic or high-value uses.
With about 840 million people in the world undernourished, and a further 2 billion expected to be born within 20 years, finding water to grow food will be one of the greatest challenges facing governments.
Currently up to 90% of all managed water is used to grow food.
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"Western diets, which depend largely on meat, are already putting great pressures on the environment. Meat-eaters consume the equivalent of about 5,000 litres [1,100 gallons] of water a day compared to the 1,000-2,000 litres used by people on vegetarian diets in developing countries. All that water has to come from somewhere."
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