ROME, May 6 (Reuters) - World food prices increased for a 11th consecutive month in April, hitting their highest level since May 2014, with sugar leading a rise in all the main indices, the United Nations food agency said on Thursday. The Food and Agriculture Organization’s food price index, which measures monthly changes for a basket of cereals, oilseeds, dairy products, meat and sugar, averaged 120.9 points last month versus a revised 118.9 in March. The March figure was previously given as 118.5. The Rome-based FAO also said in a statement that new forecasts pointed to growth in both world wheat and maize output in the coming season. Editing by Crispian Balmer Our Standards: The Thomson Reuters Trust Principles.