James Bentham, a co-author of the research from Imperial College, London, says the global trend is likely to be due primarily to improvements in nutrition and healthcare.

伦敦帝国理工学院的詹姆斯·边沁是这项研究的合著者之一。他表示，这种全球趋势可能主要是由于营养和医疗条件的改善。