First, there is credible evidence that children who are better nourished in their first years of life stay in school longer and learn more each year that they remain there. This was first demonstrated in the 1960’s, when Guatemalan researchers gave children in two randomly selected villages a nutritious porridge each day, and a much less nutritious fruit drink to children in two other villages.
第一，有可信的证据表明在他们生命的最初几年获得良好营养的孩子会在学校里呆得更久、学到的技能也更多。这是在二十世纪六十年代时最早提出来的，当时危地马拉的研究人员每天给两个随机选择的村庄的孩子喝一杯富有营养的麦片粥，而给另两个村庄的孩子喝营养低得多的果汁。最近，玻利维亚实施的Proyecto Integral de Desarrollo Infanti（PIDI）计划向低收入的农村孩子提供食物和额外的教育活动。