"Some African countries export fruit and import fruit juice, or export olives and import olive oil, simply because their past colonialists did not teach them how to process food, " he told the AFP news agency.

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The government forecasts that in fifteen years' time it will need to import substantial quantities of grain, pulses, rice, fruit and vegetables.

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In fact, fruit flies are so common in African mangoes that America has banned their import altogether, to protect its own orchards.

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The report says that if people ate as much fruit and vegetables as the government wanted, this would merely lead to a rise in the import bill.

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