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By Isma'il Kushkush WASHINGTON (Reuters) - Four scientists who specialized in sweet potatoes were named the winners of this year's World Food Prize on Tuesday for their work to make foods more nutritious. Maria Andrade of Cape Verde, Robert Mwanga of Uganda and American Jan Low, who all are from the Lima, Peru-based International Potato Center, and American Howarth Bouis of the international research group HarvestPlus were honored in a ceremony at the U.S. State Department. Kenneth M. Quinn, president of the World Food Prize Foundation, called their work "a breakthrough achievement in developing and implementing biofortification." He defined biofortification as "the process of breeding critical vitamins and micronutrients into staple crops, thereby dramatically reducing hidden hunger and improving health for millions and millions of people." The honorees' work has focused on the orange-fleshed sweet potato, an important source of vitamin A, especially in sub-Saharan Africa.